[PATCH net-next 0/29] pull-request: can-next 2022-07-20

[PATCH net-next 0/29] pull-request: can-next 2022-07-20

[Marc Kleine-Budde]

Hello Jakub, hello David,

this is a pull request of 29 patches for net-next/master.

The first 6 patches target the slcan driver. Dan Carpenter contributes
a hardening patch, followed by 5 cleanup patches.

Biju Das contributes 5 patches to prepare the sja1000 driver to
support the Renesas RZ/N1 SJA1000 CAN controller.

Dario Binacchi's patch for the slcan driver fixes a sleep with held
spin lock.

Another patch by Dario Binacchi fixes a wrong comment in the c_can
driver.

Pavel Pisa updates the CTU CAN FD IP core registers.

Stephane Grosjean contributes 3 patches to the peak_usb driver for
cleanups and support of a new MCU.

The last 12 patches are by Vincent Mailhol, they fix and improve the
txerr and rxerr reporting in all CAN drivers.

regards,
Marc

---

The following changes since commit e22c88799f2629088504e1357384f2ec3798da46:

  Merge branch '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue (2022-07-18 20:39:54 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next.git tags/linux-can-next-for-5.20-20220720

for you to fetch changes up to 1dbd8748a147c971747c8460e0cd1828cf2745d7:

  Merge branch 'can-error-set-of-fixes-and-improvement-on-txerr-and-rxerr-reporting' (2022-07-20 09:28:43 +0200)

----------------------------------------------------------------
linux-can-next-for-5.20-20220720

----------------------------------------------------------------
Biju Das (5):
      dt-bindings: can: sja1000: Convert to json-schema
      dt-bindings: can: nxp,sja1000: Document RZ/N1{D,S} support
      can: sja1000: Add Quirk for RZ/N1 SJA1000 CAN controller
      can: sja1000: Use device_get_match_data to get device data
      can: sja1000: Change the return type as void for SoC specific init

Dan Carpenter (1):
      can: slcan: use scnprintf() as a hardening measure

Dario Binacchi (2):
      can: slcan: do not sleep with a spin lock held
      can: c_can: remove wrong comment

Marc Kleine-Budde (9):
      can: slcan: convert comments to network style comments
      can: slcan: slcan_init() convert printk(LEVEL ...) to pr_level()
      can: slcan: fix whitespace issues
      can: slcan: convert comparison to NULL into !val
      can: slcan: clean up if/else
      Merge branch 'can-slcan-checkpatch-cleanups'
      Merge branch 'can-add-support-for-rz-n1-sja1000-can-controller'
      Merge branch 'can-peak_usb-cleanups-and-updates'
      Merge branch 'can-error-set-of-fixes-and-improvement-on-txerr-and-rxerr-reporting'

Pavel Pisa (1):
      can: ctucanfd: Update CTU CAN FD IP core registers to match version 3.x.

Stephane Grosjean (3):
      can: peak_usb: pcan_dump_mem(): mark input prompt and data pointer as const
      can: peak_usb: correction of an initially misnamed field name
      can: peak_usb: include support for a new MCU

Vincent Mailhol (12):
      can: pch_can: do not report txerr and rxerr during bus-off
      can: rcar_can: do not report txerr and rxerr during bus-off
      can: sja1000: do not report txerr and rxerr during bus-off
      can: slcan: do not report txerr and rxerr during bus-off
      can: hi311x: do not report txerr and rxerr during bus-off
      can: sun4i_can: do not report txerr and rxerr during bus-off
      can: kvaser_usb_hydra: do not report txerr and rxerr during bus-off
      can: kvaser_usb_leaf: do not report txerr and rxerr during bus-off
      can: usb_8dev: do not report txerr and rxerr during bus-off
      can: error: specify the values of data[5..7] of CAN error frames
      can: add CAN_ERR_CNT flag to notify availability of error counter
      can: error: add definitions for the different CAN error thresholds

 .../devicetree/bindings/net/can/nxp,sja1000.yaml   | 132 +++++++++++++++++++++
 .../devicetree/bindings/net/can/sja1000.txt        |  58 ---------
 drivers/net/can/c_can/c_can_main.c                 |   7 +-
 drivers/net/can/cc770/cc770.c                      |   1 +
 drivers/net/can/ctucanfd/ctucanfd_base.c           |   5 +-
 drivers/net/can/ctucanfd/ctucanfd_kregs.h          |  32 ++++-
 drivers/net/can/grcan.c                            |   1 +
 drivers/net/can/ifi_canfd/ifi_canfd.c              |   4 +-
 drivers/net/can/janz-ican3.c                       |   4 +-
 drivers/net/can/kvaser_pciefd.c                    |   2 +-
 drivers/net/can/m_can/m_can.c                      |   4 +-
 drivers/net/can/pch_can.c                          |   7 +-
 drivers/net/can/peak_canfd/peak_canfd.c            |   6 +-
 drivers/net/can/rcar/rcar_can.c                    |   9 +-
 drivers/net/can/rcar/rcar_canfd.c                  |   4 +-
 drivers/net/can/sja1000/sja1000.c                  |  16 ++-
 drivers/net/can/sja1000/sja1000.h                  |   3 +-
 drivers/net/can/sja1000/sja1000_platform.c         |  20 +---
 drivers/net/can/slcan/slcan-core.c                 | 117 +++++++++---------
 drivers/net/can/spi/hi311x.c                       |   6 +-
 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c     |   1 +
 drivers/net/can/sun4i_can.c                        |  10 +-
 drivers/net/can/ti_hecc.c                          |   1 +
 drivers/net/can/usb/esd_usb.c                      |   3 +-
 drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c  |  14 ++-
 drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c   |   7 +-
 drivers/net/can/usb/peak_usb/pcan_usb.c            |   1 +
 drivers/net/can/usb/peak_usb/pcan_usb_core.c       |   2 +-
 drivers/net/can/usb/peak_usb/pcan_usb_core.h       |   2 +-
 drivers/net/can/usb/peak_usb/pcan_usb_fd.c         |  68 +++++++++--
 drivers/net/can/usb/peak_usb/pcan_usb_pro.c        |   2 +-
 drivers/net/can/usb/peak_usb/pcan_usb_pro.h        |   2 +-
 drivers/net/can/usb/usb_8dev.c                     |   8 +-
 drivers/net/can/xilinx_can.c                       |   1 +
 include/uapi/linux/can/error.h                     |  20 +++-
 35 files changed, 376 insertions(+), 204 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
 delete mode 100644 Documentation/devicetree/bindings/net/can/sja1000.txt

[PATCH net-next 01/29] can: slcan: use scnprintf() as a hardening measure

[Marc Kleine-Budde]

From: Dan Carpenter <dan.carpenter@oracle.com>

The snprintf() function returns the number of bytes which *would* have
been copied if there were no space. So, since this code does not check
the return value, there if the buffer was not large enough then there
would be a buffer overflow two lines later when it does:

	actual = sl->tty->ops->write(sl->tty, sl->xbuff, n);

Use scnprintf() instead because that returns the number of bytes which
were actually copied.

Fixes: 52f9ac85b876 ("can: slcan: allow to send commands to the adapter")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/all/YsVA9KoY/ZSvNGYk@kili
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/slcan/slcan-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index 54d29a410ad5..92bdd49996d1 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -647,7 +647,7 @@ static int slcan_transmit_cmd(struct slcan *sl, const unsigned char *cmd)
 		return -ENODEV;
 	}
 
-	n = snprintf(sl->xbuff, sizeof(sl->xbuff), "%s", cmd);
+	n = scnprintf(sl->xbuff, sizeof(sl->xbuff), "%s", cmd);
 	set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
 	actual = sl->tty->ops->write(sl->tty, sl->xbuff, n);
 	sl->xleft = n - actual;

base-commit: e22c88799f2629088504e1357384f2ec3798da46
-- 
2.35.1

[PATCH net-next 02/29] can: slcan: convert comments to network style comments

[Marc Kleine-Budde]

Convert all comments to network subsystem style comments.

Link: https://lore.kernel.org/all/20220704125954.1587880-2-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/slcan/slcan-core.c | 55 +++++++++++++-----------------
 1 file changed, 24 insertions(+), 31 deletions(-)

diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index 92bdd49996d1..2d3bf15061a7 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -67,8 +67,9 @@ MODULE_AUTHOR("Oliver Hartkopp <socketcan@hartkopp.net>");
 #define SLCAN_MAGIC 0x53CA
 
 static int maxdev = 10;		/* MAX number of SLCAN channels;
-				   This can be overridden with
-				   insmod slcan.ko maxdev=nnn	*/
+				 * This can be overridden with
+				 * insmod slcan.ko maxdev=nnn
+				 */
 module_param(maxdev, int, 0);
 MODULE_PARM_DESC(maxdev, "Maximum number of slcan interfaces");
 
@@ -139,12 +140,11 @@ int slcan_enable_err_rst_on_open(struct net_device *ndev, bool on)
 	return 0;
 }
 
- /************************************************************************
-  *			SLCAN ENCAPSULATION FORMAT			 *
-  ************************************************************************/
+/*************************************************************************
+ *			SLCAN ENCAPSULATION FORMAT			 *
+ *************************************************************************/
 
-/*
- * A CAN frame has a can_id (11 bit standard frame format OR 29 bit extended
+/* A CAN frame has a can_id (11 bit standard frame format OR 29 bit extended
  * frame format) a data length code (len) which can be from 0 to 8
  * and up to <len> data bytes as payload.
  * Additionally a CAN frame may become a remote transmission frame if the
@@ -174,9 +174,9 @@ int slcan_enable_err_rst_on_open(struct net_device *ndev, bool on)
  *
  */
 
- /************************************************************************
-  *			STANDARD SLCAN DECAPSULATION			 *
-  ************************************************************************/
+/*************************************************************************
+ *			STANDARD SLCAN DECAPSULATION			 *
+ *************************************************************************/
 
 /* Send one completely decapsulated can_frame to the network layer */
 static void slc_bump_frame(struct slcan *sl)
@@ -486,9 +486,9 @@ static void slcan_unesc(struct slcan *sl, unsigned char s)
 	}
 }
 
- /************************************************************************
-  *			STANDARD SLCAN ENCAPSULATION			 *
-  ************************************************************************/
+/*************************************************************************
+ *			STANDARD SLCAN ENCAPSULATION			 *
+ *************************************************************************/
 
 /* Encapsulate one can_frame and stuff into a TTY queue. */
 static void slc_encaps(struct slcan *sl, struct can_frame *cf)
@@ -575,7 +575,8 @@ static void slcan_transmit(struct work_struct *work)
 		}
 
 		/* Now serial buffer is almost free & we can start
-		 * transmission of another packet */
+		 * transmission of another packet
+		 */
 		sl->dev->stats.tx_packets++;
 		clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
 		spin_unlock_bh(&sl->lock);
@@ -589,8 +590,7 @@ static void slcan_transmit(struct work_struct *work)
 	spin_unlock_bh(&sl->lock);
 }
 
-/*
- * Called by the driver when there's room for more data.
+/* Called by the driver when there's room for more data.
  * Schedule the transmit.
  */
 static void slcan_write_wakeup(struct tty_struct *tty)
@@ -632,7 +632,6 @@ static netdev_tx_t slc_xmit(struct sk_buff *skb, struct net_device *dev)
 	return NETDEV_TX_OK;
 }
 
-
 /******************************************
  *   Routines looking at netdevice side.
  ******************************************/
@@ -736,7 +735,6 @@ static int slc_open(struct net_device *dev)
 		/* The CAN framework has already validate the bitrate value,
 		 * so we can avoid to check if `s' has been properly set.
 		 */
-
 		snprintf(cmd, sizeof(cmd), "C\rS%d\r", s);
 		err = slcan_transmit_cmd(sl, cmd);
 		if (err) {
@@ -792,18 +790,16 @@ static const struct net_device_ops slc_netdev_ops = {
 };
 
 /******************************************
-  Routines looking at TTY side.
+ *  Routines looking at TTY side.
  ******************************************/
 
-/*
- * Handle the 'receiver data ready' interrupt.
+/* Handle the 'receiver data ready' interrupt.
  * This function is called by the 'tty_io' module in the kernel when
  * a block of SLCAN data has been received, which can now be decapsulated
  * and sent on to some IP layer for further processing. This will not
  * be re-entered while running but other ldisc functions may be called
  * in parallel
  */
-
 static void slcan_receive_buf(struct tty_struct *tty,
 			      const unsigned char *cp, const char *fp,
 			      int count)
@@ -890,8 +886,7 @@ static struct slcan *slc_alloc(void)
 	return sl;
 }
 
-/*
- * Open the high-level part of the SLCAN channel.
+/* Open the high-level part of the SLCAN channel.
  * This function is called by the TTY module when the
  * SLCAN line discipline is called for.  Because we are
  * sure the tty line exists, we only have to link it to
@@ -899,7 +894,6 @@ static struct slcan *slc_alloc(void)
  *
  * Called in process context serialized from other ldisc calls.
  */
-
 static int slcan_open(struct tty_struct *tty)
 {
 	struct slcan *sl;
@@ -912,8 +906,8 @@ static int slcan_open(struct tty_struct *tty)
 		return -EOPNOTSUPP;
 
 	/* RTnetlink lock is misused here to serialize concurrent
-	   opens of slcan channels. There are better ways, but it is
-	   the simplest one.
+	 * opens of slcan channels. There are better ways, but it is
+	 * the simplest one.
 	 */
 	rtnl_lock();
 
@@ -974,14 +968,12 @@ static int slcan_open(struct tty_struct *tty)
 	return err;
 }
 
-/*
- * Close down a SLCAN channel.
+/* Close down a SLCAN channel.
  * This means flushing out any pending queues, and then returning. This
  * call is serialized against other ldisc functions.
  *
  * We also use this method for a hangup event.
  */
-
 static void slcan_close(struct tty_struct *tty)
 {
 	struct slcan *sl = (struct slcan *) tty->disc_data;
@@ -1104,7 +1096,8 @@ static void __exit slcan_exit(void)
 	} while (busy && time_before(jiffies, timeout));
 
 	/* FIXME: hangup is async so we should wait when doing this second
-	   phase */
+	 * phase
+	 */
 
 	for (i = 0; i < maxdev; i++) {
 		dev = slcan_devs[i];
-- 
2.35.1

[PATCH net-next 03/29] can: slcan: slcan_init() convert printk(LEVEL ...) to pr_level()

[Marc Kleine-Budde]

Convert the last printk(LEVEL ...) to pr_level().

Link: https://lore.kernel.org/all/20220704125954.1587880-3-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/slcan/slcan-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index 2d3bf15061a7..ead3afefcf19 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -1057,7 +1057,7 @@ static int __init slcan_init(void)
 	/* Fill in our line protocol discipline, and register it */
 	status = tty_register_ldisc(&slc_ldisc);
 	if (status)  {
-		printk(KERN_ERR "slcan: can't register line discipline\n");
+		pr_err("slcan: can't register line discipline\n");
 		kfree(slcan_devs);
 	}
 	return status;
-- 
2.35.1

[PATCH net-next 04/29] can: slcan: fix whitespace issues

[Marc Kleine-Budde]

Add and remove whitespace to make checkpatch happy.

Link: https://lore.kernel.org/all/20220704125954.1587880-4-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/slcan/slcan-core.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index ead3afefcf19..aa15c06dc198 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -74,7 +74,7 @@ module_param(maxdev, int, 0);
 MODULE_PARM_DESC(maxdev, "Maximum number of slcan interfaces");
 
 /* maximum rx buffer len: extended CAN frame with timestamp */
-#define SLC_MTU (sizeof("T1111222281122334455667788EA5F\r")+1)
+#define SLC_MTU (sizeof("T1111222281122334455667788EA5F\r") + 1)
 
 #define SLC_CMD_LEN 1
 #define SLC_SFF_ID_LEN 3
@@ -624,7 +624,7 @@ static netdev_tx_t slc_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 
 	netif_stop_queue(sl->dev);
-	slc_encaps(sl, (struct can_frame *) skb->data); /* encaps & send */
+	slc_encaps(sl, (struct can_frame *)skb->data); /* encaps & send */
 	spin_unlock(&sl->lock);
 
 out:
@@ -804,7 +804,7 @@ static void slcan_receive_buf(struct tty_struct *tty,
 			      const unsigned char *cp, const char *fp,
 			      int count)
 {
-	struct slcan *sl = (struct slcan *) tty->disc_data;
+	struct slcan *sl = (struct slcan *)tty->disc_data;
 
 	if (!sl || sl->magic != SLCAN_MAGIC || !netif_running(sl->dev))
 		return;
@@ -976,7 +976,7 @@ static int slcan_open(struct tty_struct *tty)
  */
 static void slcan_close(struct tty_struct *tty)
 {
-	struct slcan *sl = (struct slcan *) tty->disc_data;
+	struct slcan *sl = (struct slcan *)tty->disc_data;
 
 	/* First make sure we're connected. */
 	if (!sl || sl->magic != SLCAN_MAGIC || sl->tty != tty)
@@ -1006,7 +1006,7 @@ static void slcan_hangup(struct tty_struct *tty)
 static int slcan_ioctl(struct tty_struct *tty, unsigned int cmd,
 		       unsigned long arg)
 {
-	struct slcan *sl = (struct slcan *) tty->disc_data;
+	struct slcan *sl = (struct slcan *)tty->disc_data;
 	unsigned int tmp;
 
 	/* First make sure we're connected. */
-- 
2.35.1

[PATCH net-next 05/29] can: slcan: convert comparison to NULL into !val

[Marc Kleine-Budde]

All comparison to NULL could be written "!val", convert them to make
checkpatch happy.

Link: https://lore.kernel.org/all/20220704125954.1587880-5-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/slcan/slcan-core.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index aa15c06dc198..70a6d1ba46eb 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -618,7 +618,7 @@ static netdev_tx_t slc_xmit(struct sk_buff *skb, struct net_device *dev)
 		netdev_warn(dev, "xmit: iface is down\n");
 		goto out;
 	}
-	if (sl->tty == NULL) {
+	if (!sl->tty) {
 		spin_unlock(&sl->lock);
 		goto out;
 	}
@@ -707,7 +707,7 @@ static int slc_open(struct net_device *dev)
 	unsigned char cmd[SLC_MTU];
 	int err, s;
 
-	if (sl->tty == NULL)
+	if (!sl->tty)
 		return -ENODEV;
 
 	/* The baud rate is not set with the command
@@ -834,7 +834,7 @@ static void slc_sync(void)
 
 	for (i = 0; i < maxdev; i++) {
 		dev = slcan_devs[i];
-		if (dev == NULL)
+		if (!dev)
 			break;
 
 		sl = netdev_priv(dev);
@@ -854,9 +854,8 @@ static struct slcan *slc_alloc(void)
 
 	for (i = 0; i < maxdev; i++) {
 		dev = slcan_devs[i];
-		if (dev == NULL)
+		if (!dev)
 			break;
-
 	}
 
 	/* Sorry, too many, all slots in use */
@@ -902,7 +901,7 @@ static int slcan_open(struct tty_struct *tty)
 	if (!capable(CAP_NET_ADMIN))
 		return -EPERM;
 
-	if (tty->ops->write == NULL)
+	if (!tty->ops->write)
 		return -EOPNOTSUPP;
 
 	/* RTnetlink lock is misused here to serialize concurrent
@@ -924,7 +923,7 @@ static int slcan_open(struct tty_struct *tty)
 	/* OK.  Find a free SLCAN channel to use. */
 	err = -ENFILE;
 	sl = slc_alloc();
-	if (sl == NULL)
+	if (!sl)
 		goto err_exit;
 
 	sl->tty = tty;
@@ -1071,7 +1070,7 @@ static void __exit slcan_exit(void)
 	unsigned long timeout = jiffies + HZ;
 	int busy = 0;
 
-	if (slcan_devs == NULL)
+	if (!slcan_devs)
 		return;
 
 	/* First of all: check for active disciplines and hangup them.
-- 
2.35.1

[PATCH net-next 06/29] can: slcan: clean up if/else

[Marc Kleine-Budde]

Remove braces after if() for single statement blocks, also remove else
after return() in if() block.

Link: https://lore.kernel.org/all/20220704125954.1587880-6-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/slcan/slcan-core.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index 70a6d1ba46eb..d9bf75a25988 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -469,19 +469,19 @@ static void slcan_unesc(struct slcan *sl, unsigned char s)
 {
 	if ((s == '\r') || (s == '\a')) { /* CR or BEL ends the pdu */
 		if (!test_and_clear_bit(SLF_ERROR, &sl->flags) &&
-		    (sl->rcount > 4))  {
+		    sl->rcount > 4)
 			slc_bump(sl);
-		}
+
 		sl->rcount = 0;
 	} else {
 		if (!test_bit(SLF_ERROR, &sl->flags))  {
 			if (sl->rcount < SLC_MTU)  {
 				sl->rbuff[sl->rcount++] = s;
 				return;
-			} else {
-				sl->dev->stats.rx_over_errors++;
-				set_bit(SLF_ERROR, &sl->flags);
 			}
+
+			sl->dev->stats.rx_over_errors++;
+			set_bit(SLF_ERROR, &sl->flags);
 		}
 	}
 }
@@ -1104,9 +1104,8 @@ static void __exit slcan_exit(void)
 			continue;
 
 		sl = netdev_priv(dev);
-		if (sl->tty) {
+		if (sl->tty)
 			netdev_err(dev, "tty discipline still running\n");
-		}
 
 		slc_close(dev);
 		unregister_candev(dev);
-- 
2.35.1

[PATCH net-next 07/29] dt-bindings: can: sja1000: Convert to json-schema

[Marc Kleine-Budde]

From: Biju Das <biju.das.jz@bp.renesas.com>

Convert the NXP SJA1000 CAN Controller Device Tree binding
documentation to json-schema.

Update the example to match reality.

Link: https://lore.kernel.org/all/20220710115248.190280-2-biju.das.jz@bp.renesas.com
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 .../bindings/net/can/nxp,sja1000.yaml         | 101 ++++++++++++++++++
 .../devicetree/bindings/net/can/sja1000.txt   |  58 ----------
 2 files changed, 101 insertions(+), 58 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
 delete mode 100644 Documentation/devicetree/bindings/net/can/sja1000.txt

diff --git a/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml b/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
new file mode 100644
index 000000000000..ca9bfdfa50ab
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
@@ -0,0 +1,101 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/can/nxp,sja1000.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Memory mapped SJA1000 CAN controller from NXP (formerly Philips)
+
+maintainers:
+  - Wolfgang Grandegger <wg@grandegger.com>
+
+properties:
+  compatible:
+    enum:
+      - nxp,sja1000
+      - technologic,sja1000
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  reg-io-width:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: I/O register width (in bytes) implemented by this device
+    default: 1
+    enum: [ 1, 2, 4 ]
+
+  nxp,external-clock-frequency:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    default: 16000000
+    description: |
+      Frequency of the external oscillator clock in Hz.
+      The internal clock frequency used by the SJA1000 is half of that value.
+
+  nxp,tx-output-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 0, 1, 2, 3 ]
+    default: 1
+    description: |
+      operation mode of the TX output control logic. Valid values are:
+        <0> : bi-phase output mode
+        <1> : normal output mode (default)
+        <2> : test output mode
+        <3> : clock output mode
+
+  nxp,tx-output-config:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    default: 0x02
+    description: |
+      TX output pin configuration. Valid values are any one of the below
+      or combination of TX0 and TX1:
+        <0x01> : TX0 invert
+        <0x02> : TX0 pull-down (default)
+        <0x04> : TX0 pull-up
+        <0x06> : TX0 push-pull
+        <0x08> : TX1 invert
+        <0x10> : TX1 pull-down
+        <0x20> : TX1 pull-up
+        <0x30> : TX1 push-pull
+
+  nxp,clock-out-frequency:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      clock frequency in Hz on the CLKOUT pin.
+      If not specified or if the specified value is 0, the CLKOUT pin
+      will be disabled.
+
+  nxp,no-comparator-bypass:
+    type: boolean
+    description: Allows to disable the CAN input comparator.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+allOf:
+  - $ref: can-controller.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: technologic,sja1000
+    then:
+      required:
+        - reg-io-width
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    can@1a000 {
+        compatible = "technologic,sja1000";
+        reg = <0x1a000 0x100>;
+        interrupts = <1>;
+        reg-io-width = <2>;
+        nxp,tx-output-config = <0x06>;
+        nxp,external-clock-frequency = <24000000>;
+    };
diff --git a/Documentation/devicetree/bindings/net/can/sja1000.txt b/Documentation/devicetree/bindings/net/can/sja1000.txt
deleted file mode 100644
index ac3160eca96a..000000000000
--- a/Documentation/devicetree/bindings/net/can/sja1000.txt
+++ /dev/null
@@ -1,58 +0,0 @@
-Memory mapped SJA1000 CAN controller from NXP (formerly Philips)
-
-Required properties:
-
-- compatible : should be one of "nxp,sja1000", "technologic,sja1000".
-
-- reg : should specify the chip select, address offset and size required
-	to map the registers of the SJA1000. The size is usually 0x80.
-
-- interrupts: property with a value describing the interrupt source
-	(number and sensitivity) required for the SJA1000.
-
-Optional properties:
-
-- reg-io-width : Specify the size (in bytes) of the IO accesses that
-	should be performed on the device.  Valid value is 1, 2 or 4.
-	This property is ignored for technologic version.
-	Default to 1 (8 bits).
-
-- nxp,external-clock-frequency : Frequency of the external oscillator
-	clock in Hz. Note that the internal clock frequency used by the
-	SJA1000 is half of that value. If not specified, a default value
-	of 16000000 (16 MHz) is used.
-
-- nxp,tx-output-mode : operation mode of the TX output control logic:
-	<0x0> : bi-phase output mode
-	<0x1> : normal output mode (default)
-	<0x2> : test output mode
-	<0x3> : clock output mode
-
-- nxp,tx-output-config : TX output pin configuration:
-	<0x01> : TX0 invert
-	<0x02> : TX0 pull-down (default)
-	<0x04> : TX0 pull-up
-	<0x06> : TX0 push-pull
-	<0x08> : TX1 invert
-	<0x10> : TX1 pull-down
-	<0x20> : TX1 pull-up
-	<0x30> : TX1 push-pull
-
-- nxp,clock-out-frequency : clock frequency in Hz on the CLKOUT pin.
-	If not specified or if the specified value is 0, the CLKOUT pin
-	will be disabled.
-
-- nxp,no-comparator-bypass : Allows to disable the CAN input comparator.
-
-For further information, please have a look to the SJA1000 data sheet.
-
-Examples:
-
-can@3,100 {
-	compatible = "nxp,sja1000";
-	reg = <3 0x100 0x80>;
-	interrupts = <2 0>;
-	interrupt-parent = <&mpic>;
-	nxp,external-clock-frequency = <16000000>;
-};
-
-- 
2.35.1

[PATCH net-next 08/29] dt-bindings: can: nxp,sja1000: Document RZ/N1{D,S} support

[Marc Kleine-Budde]

From: Biju Das <biju.das.jz@bp.renesas.com>

Add CAN binding documentation for Renesas RZ/N1 SoC.

The SJA1000 CAN controller on RZ/N1 SoC has some differences compared
to others like it has no clock divider register (CDR) support and it has
no HW loopback (HW doesn't see tx messages on rx), so introduced a new
compatible 'renesas,rzn1-sja1000' to handle these differences.

Link: https://lore.kernel.org/all/20220710115248.190280-3-biju.das.jz@bp.renesas.com
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 .../bindings/net/can/nxp,sja1000.yaml         | 39 +++++++++++++++++--
 1 file changed, 35 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml b/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
index ca9bfdfa50ab..b1327c5b86cf 100644
--- a/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
+++ b/Documentation/devicetree/bindings/net/can/nxp,sja1000.yaml
@@ -11,9 +11,15 @@ maintainers:
 
 properties:
   compatible:
-    enum:
-      - nxp,sja1000
-      - technologic,sja1000
+    oneOf:
+      - enum:
+          - nxp,sja1000
+          - technologic,sja1000
+      - items:
+          - enum:
+              - renesas,r9a06g032-sja1000 # RZ/N1D
+              - renesas,r9a06g033-sja1000 # RZ/N1S
+          - const: renesas,rzn1-sja1000 # RZ/N1
 
   reg:
     maxItems: 1
@@ -21,6 +27,9 @@ properties:
   interrupts:
     maxItems: 1
 
+  clocks:
+    maxItems: 1
+
   reg-io-width:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: I/O register width (in bytes) implemented by this device
@@ -82,10 +91,20 @@ allOf:
       properties:
         compatible:
           contains:
-            const: technologic,sja1000
+            enum:
+              - technologic,sja1000
+              - renesas,rzn1-sja1000
     then:
       required:
         - reg-io-width
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,rzn1-sja1000
+    then:
+      required:
+        - clocks
 
 unevaluatedProperties: false
 
@@ -99,3 +118,15 @@ examples:
         nxp,tx-output-config = <0x06>;
         nxp,external-clock-frequency = <24000000>;
     };
+
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/r9a06g032-sysctrl.h>
+
+    can@52104000 {
+        compatible = "renesas,r9a06g032-sja1000", "renesas,rzn1-sja1000";
+        reg = <0x52104000 0x800>;
+        reg-io-width = <4>;
+        interrupts = <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&sysctrl R9A06G032_HCLK_CAN0>;
+    };
-- 
2.35.1

[PATCH net-next 09/29] can: sja1000: Add Quirk for RZ/N1 SJA1000 CAN controller

[Marc Kleine-Budde]

From: Biju Das <biju.das.jz@bp.renesas.com>

As per Chapter 6.5.16 of the RZ/N1 Peripheral Manual, The SJA1000
CAN controller does not support Clock Divider Register compared to
the reference Philips SJA1000 device.

This patch adds a device quirk to handle this difference.

Link: https://lore.kernel.org/all/20220710115248.190280-4-biju.das.jz@bp.renesas.com
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/sja1000/sja1000.c | 8 +++++---
 drivers/net/can/sja1000/sja1000.h | 3 ++-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 2e7638f98cf1..d9da471f1bb9 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -183,8 +183,9 @@ static void chipset_init(struct net_device *dev)
 {
 	struct sja1000_priv *priv = netdev_priv(dev);
 
-	/* set clock divider and output control register */
-	priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
+	if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG))
+		/* set clock divider and output control register */
+		priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
 
 	/* set acceptance filter (accept all) */
 	priv->write_reg(priv, SJA1000_ACCC0, 0x00);
@@ -209,7 +210,8 @@ static void sja1000_start(struct net_device *dev)
 		set_reset_mode(dev);
 
 	/* Initialize chip if uninitialized at this stage */
-	if (!(priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
+	if (!(priv->flags & SJA1000_QUIRK_NO_CDR_REG ||
+	      priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
 		chipset_init(dev);
 
 	/* Clear error counters and error code capture */
diff --git a/drivers/net/can/sja1000/sja1000.h b/drivers/net/can/sja1000/sja1000.h
index 9d46398f8154..7f736f1df547 100644
--- a/drivers/net/can/sja1000/sja1000.h
+++ b/drivers/net/can/sja1000/sja1000.h
@@ -145,7 +145,8 @@
 /*
  * Flags for sja1000priv.flags
  */
-#define SJA1000_CUSTOM_IRQ_HANDLER 0x1
+#define SJA1000_CUSTOM_IRQ_HANDLER	BIT(0)
+#define SJA1000_QUIRK_NO_CDR_REG	BIT(1)
 
 /*
  * SJA1000 private data structure
-- 
2.35.1

[PATCH net-next 10/29] can: sja1000: Use device_get_match_data to get device data

[Marc Kleine-Budde]

From: Biju Das <biju.das.jz@bp.renesas.com>

This patch replaces of_match_device->device_get_match_data
to get pointer to device data.

Link: https://lore.kernel.org/all/20220710115248.190280-5-biju.das.jz@bp.renesas.com
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/sja1000/sja1000_platform.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/sja1000/sja1000_platform.c b/drivers/net/can/sja1000/sja1000_platform.c
index f9ec7bd8dfac..0b78568f5286 100644
--- a/drivers/net/can/sja1000/sja1000_platform.c
+++ b/drivers/net/can/sja1000/sja1000_platform.c
@@ -210,7 +210,6 @@ static int sp_probe(struct platform_device *pdev)
 	struct resource *res_mem, *res_irq = NULL;
 	struct sja1000_platform_data *pdata;
 	struct device_node *of = pdev->dev.of_node;
-	const struct of_device_id *of_id;
 	const struct sja1000_of_data *of_data = NULL;
 	size_t priv_sz = 0;
 
@@ -243,11 +242,9 @@ static int sp_probe(struct platform_device *pdev)
 			return -ENODEV;
 	}
 
-	of_id = of_match_device(sp_of_table, &pdev->dev);
-	if (of_id && of_id->data) {
-		of_data = of_id->data;
+	of_data = device_get_match_data(&pdev->dev);
+	if (of_data)
 		priv_sz = of_data->priv_sz;
-	}
 
 	dev = alloc_sja1000dev(priv_sz);
 	if (!dev)
-- 
2.35.1

[PATCH net-next 11/29] can: sja1000: Change the return type as void for SoC specific init

[Marc Kleine-Budde]

From: Biju Das <biju.das.jz@bp.renesas.com>

Change the return type as void for SoC specific init function as it
always return 0.

Link: https://lore.kernel.org/all/20220710115248.190280-6-biju.das.jz@bp.renesas.com
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/sja1000/sja1000_platform.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/net/can/sja1000/sja1000_platform.c b/drivers/net/can/sja1000/sja1000_platform.c
index 0b78568f5286..81bc741905fd 100644
--- a/drivers/net/can/sja1000/sja1000_platform.c
+++ b/drivers/net/can/sja1000/sja1000_platform.c
@@ -31,7 +31,7 @@ MODULE_LICENSE("GPL v2");
 
 struct sja1000_of_data {
 	size_t  priv_sz;
-	int     (*init)(struct sja1000_priv *priv, struct device_node *of);
+	void    (*init)(struct sja1000_priv *priv, struct device_node *of);
 };
 
 struct technologic_priv {
@@ -94,15 +94,13 @@ static void sp_technologic_write_reg16(const struct sja1000_priv *priv,
 	spin_unlock_irqrestore(&tp->io_lock, flags);
 }
 
-static int sp_technologic_init(struct sja1000_priv *priv, struct device_node *of)
+static void sp_technologic_init(struct sja1000_priv *priv, struct device_node *of)
 {
 	struct technologic_priv *tp = priv->priv;
 
 	priv->read_reg = sp_technologic_read_reg16;
 	priv->write_reg = sp_technologic_write_reg16;
 	spin_lock_init(&tp->io_lock);
-
-	return 0;
 }
 
 static void sp_populate(struct sja1000_priv *priv,
@@ -266,11 +264,8 @@ static int sp_probe(struct platform_device *pdev)
 	if (of) {
 		sp_populate_of(priv, of);
 
-		if (of_data && of_data->init) {
-			err = of_data->init(priv, of);
-			if (err)
-				goto exit_free;
-		}
+		if (of_data && of_data->init)
+			of_data->init(priv, of);
 	} else {
 		sp_populate(priv, pdata, res_mem->flags);
 	}
-- 
2.35.1

[PATCH net-next 12/29] can: slcan: do not sleep with a spin lock held

[Marc Kleine-Budde]

From: Dario Binacchi <dario.binacchi@amarulasolutions.com>

We can't call close_candev() with a spin lock held, so release the lock
before calling it. After calling close_candev(), we can update the
fields of the private `struct can_priv' without having to acquire the
lock.

Fixes: c4e54b063f42f ("can: slcan: use CAN network device driver API")
Link: https://lore.kernel.org/linux-kernel/Ysrf1Yc5DaRGN1WE@xsang-OptiPlex-9020/
Link: https://lore.kernel.org/all/20220715072951.859586-1-dario.binacchi@amarulasolutions.com
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/slcan/slcan-core.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index d9bf75a25988..057b211f3e7f 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -688,15 +688,14 @@ static int slc_close(struct net_device *dev)
 		clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);
 	}
 	netif_stop_queue(dev);
+	sl->rcount   = 0;
+	sl->xleft    = 0;
+	spin_unlock_bh(&sl->lock);
 	close_candev(dev);
 	sl->can.state = CAN_STATE_STOPPED;
 	if (sl->can.bittiming.bitrate == CAN_BITRATE_UNKNOWN)
 		sl->can.bittiming.bitrate = CAN_BITRATE_UNSET;
 
-	sl->rcount   = 0;
-	sl->xleft    = 0;
-	spin_unlock_bh(&sl->lock);
-
 	return 0;
 }
 
-- 
2.35.1

[PATCH net-next 13/29] can: c_can: remove wrong comment

[Marc Kleine-Budde]

From: Dario Binacchi <dario.binacchi@amarulasolutions.com>

The comment referred to a status (warning) other than the one that was
being managed (active error).

Link: https://lore.kernel.org/all/20220716170112.2020291-1-dario.binacchi@amarulasolutions.com
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can_main.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/can/c_can/c_can_main.c b/drivers/net/can/c_can/c_can_main.c
index a7362af0babb..ed4db4cf8716 100644
--- a/drivers/net/can/c_can/c_can_main.c
+++ b/drivers/net/can/c_can/c_can_main.c
@@ -952,7 +952,6 @@ static int c_can_handle_state_change(struct net_device *dev,
 
 	switch (error_type) {
 	case C_CAN_NO_ERROR:
-		/* error warning state */
 		cf->can_id |= CAN_ERR_CRTL;
 		cf->data[1] = CAN_ERR_CRTL_ACTIVE;
 		cf->data[6] = bec.txerr;
-- 
2.35.1

[PATCH net-next 14/29] can: ctucanfd: Update CTU CAN FD IP core registers to match version 3.x.

[Marc Kleine-Budde]

From: Pavel Pisa <pisa@cmp.felk.cvut.cz>

The update is compatible/pure extension of 2.x IP core version

 - new option for 2, 4, or 8 Tx buffers option during synthesis.
   The 2.x version has fixed 4 Tx buffers. 3.x version default
   is 4 as well
 - new REG_TX_COMMAND_TXT_BUFFER_COUNT provides synthesis
   choice. When read as 0 assume 2.x core with fixed 4 Tx buffers.
 - new REG_ERR_CAPT_TS_BITS field to provide most significant
   active/implemented timestamp bit. For 2.x read as zero,
   assume value 63 is such case for 64 bit counter.
 - new REG_MODE_RXBAM bit which controls automatic advance
   to next word after Rx FIFO register read. Bit is set
   to 1 by default after the core reset (REG_MODE_RST)
   and value 1 has to be preserved for the normal ctucanfd
   Linux driver operation. Even preceding driver version
   resets core and then modifies only known/required MODE
   register bits so backward and forward compatibility is
   ensured.

See complete datasheet for time-triggered and other
updated capabilities

  http://canbus.pages.fel.cvut.cz/ctucanfd_ip_core/doc/Datasheet.pdf

The fields related to ongoing Ondrej Ille's work
on fault tolerant version with parity protected buffers
and FIFOs are not included for now. Their inclusion will
be considered when design is settled and tested.

Link: https://lore.kernel.org/all/14a98ed1829121f0f3bde784f1aa533bc3cc7fe0.1658139843.git.pisa@cmp.felk.cvut.cz
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/ctucanfd/ctucanfd_kregs.h | 32 ++++++++++++++++++++---
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/ctucanfd/ctucanfd_kregs.h b/drivers/net/can/ctucanfd/ctucanfd_kregs.h
index edc1c1a24348..0c181ab51bf8 100644
--- a/drivers/net/can/ctucanfd/ctucanfd_kregs.h
+++ b/drivers/net/can/ctucanfd/ctucanfd_kregs.h
@@ -4,9 +4,9 @@
  * CTU CAN FD IP Core
  *
  * Copyright (C) 2015-2018 Ondrej Ille <ondrej.ille@gmail.com> FEE CTU
- * Copyright (C) 2018-2021 Ondrej Ille <ondrej.ille@gmail.com> self-funded
+ * Copyright (C) 2018-2022 Ondrej Ille <ondrej.ille@gmail.com> self-funded
  * Copyright (C) 2018-2019 Martin Jerabek <martin.jerabek01@gmail.com> FEE CTU
- * Copyright (C) 2018-2021 Pavel Pisa <pisa@cmp.felk.cvut.cz> FEE CTU/self-funded
+ * Copyright (C) 2018-2022 Pavel Pisa <pisa@cmp.felk.cvut.cz> FEE CTU/self-funded
  *
  * Project advisors:
  *     Jiri Novak <jnovak@fel.cvut.cz>
@@ -64,9 +64,12 @@ enum ctu_can_fd_can_registers {
 	CTUCANFD_RX_DATA              = 0x6c,
 	CTUCANFD_TX_STATUS            = 0x70,
 	CTUCANFD_TX_COMMAND           = 0x74,
+	CTUCANFD_TXTB_INFO            = 0x76,
 	CTUCANFD_TX_PRIORITY          = 0x78,
 	CTUCANFD_ERR_CAPT             = 0x7c,
+	CTUCANFD_RETR_CTR             = 0x7d,
 	CTUCANFD_ALC                  = 0x7e,
+	CTUCANFD_TS_INFO              = 0x7f,
 	CTUCANFD_TRV_DELAY            = 0x80,
 	CTUCANFD_SSP_CFG              = 0x82,
 	CTUCANFD_RX_FR_CTR            = 0x84,
@@ -102,8 +105,12 @@ enum ctu_can_fd_can_registers {
 #define REG_MODE_STM BIT(2)
 #define REG_MODE_AFM BIT(3)
 #define REG_MODE_FDE BIT(4)
+#define REG_MODE_TTTM BIT(5)
+#define REG_MODE_ROM BIT(6)
 #define REG_MODE_ACF BIT(7)
 #define REG_MODE_TSTM BIT(8)
+#define REG_MODE_RXBAM BIT(9)
+#define REG_MODE_SAM BIT(11)
 #define REG_MODE_RTRLE BIT(16)
 #define REG_MODE_RTRTH GENMASK(20, 17)
 #define REG_MODE_ILBP BIT(21)
@@ -123,8 +130,10 @@ enum ctu_can_fd_can_registers {
 #define REG_STATUS_EWL BIT(6)
 #define REG_STATUS_IDLE BIT(7)
 #define REG_STATUS_PEXS BIT(8)
+#define REG_STATUS_STCNT BIT(16)
 
 /*  COMMAND registers */
+#define REG_COMMAND_RXRPMV BIT(1)
 #define REG_COMMAND_RRB BIT(2)
 #define REG_COMMAND_CDO BIT(3)
 #define REG_COMMAND_ERCRST BIT(4)
@@ -263,8 +272,12 @@ enum ctu_can_fd_can_registers {
 #define REG_TX_STATUS_TX2S GENMASK(7, 4)
 #define REG_TX_STATUS_TX3S GENMASK(11, 8)
 #define REG_TX_STATUS_TX4S GENMASK(15, 12)
+#define REG_TX_STATUS_TX5S GENMASK(19, 16)
+#define REG_TX_STATUS_TX6S GENMASK(23, 20)
+#define REG_TX_STATUS_TX7S GENMASK(27, 24)
+#define REG_TX_STATUS_TX8S GENMASK(31, 28)
 
-/*  TX_COMMAND registers */
+/*  TX_COMMAND TXTB_INFO registers */
 #define REG_TX_COMMAND_TXCE BIT(0)
 #define REG_TX_COMMAND_TXCR BIT(1)
 #define REG_TX_COMMAND_TXCA BIT(2)
@@ -272,18 +285,29 @@ enum ctu_can_fd_can_registers {
 #define REG_TX_COMMAND_TXB2 BIT(9)
 #define REG_TX_COMMAND_TXB3 BIT(10)
 #define REG_TX_COMMAND_TXB4 BIT(11)
+#define REG_TX_COMMAND_TXB5 BIT(12)
+#define REG_TX_COMMAND_TXB6 BIT(13)
+#define REG_TX_COMMAND_TXB7 BIT(14)
+#define REG_TX_COMMAND_TXB8 BIT(15)
+#define REG_TX_COMMAND_TXT_BUFFER_COUNT GENMASK(19, 16)
 
 /*  TX_PRIORITY registers */
 #define REG_TX_PRIORITY_TXT1P GENMASK(2, 0)
 #define REG_TX_PRIORITY_TXT2P GENMASK(6, 4)
 #define REG_TX_PRIORITY_TXT3P GENMASK(10, 8)
 #define REG_TX_PRIORITY_TXT4P GENMASK(14, 12)
+#define REG_TX_PRIORITY_TXT5P GENMASK(18, 16)
+#define REG_TX_PRIORITY_TXT6P GENMASK(22, 20)
+#define REG_TX_PRIORITY_TXT7P GENMASK(26, 24)
+#define REG_TX_PRIORITY_TXT8P GENMASK(30, 28)
 
-/*  ERR_CAPT ALC registers */
+/*  ERR_CAPT RETR_CTR ALC TS_INFO registers */
 #define REG_ERR_CAPT_ERR_POS GENMASK(4, 0)
 #define REG_ERR_CAPT_ERR_TYPE GENMASK(7, 5)
+#define REG_ERR_CAPT_RETR_CTR_VAL GENMASK(11, 8)
 #define REG_ERR_CAPT_ALC_BIT GENMASK(20, 16)
 #define REG_ERR_CAPT_ALC_ID_FIELD GENMASK(23, 21)
+#define REG_ERR_CAPT_TS_BITS GENMASK(29, 24)
 
 /*  TRV_DELAY SSP_CFG registers */
 #define REG_TRV_DELAY_TRV_DELAY_VALUE GENMASK(6, 0)
-- 
2.35.1

[PATCH net-next 15/29] can: peak_usb: pcan_dump_mem(): mark input prompt and data pointer as const

[Marc Kleine-Budde]

From: Stephane Grosjean <s.grosjean@peak-system.com>

Mark the input prompt and data pointer as const.

Link: https://lore.kernel.org/all/20220719120632.26774-1-s.grosjean@peak-system.com
Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
[mkl: mark data pointer as const, too; update commit message]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/peak_usb/pcan_usb_core.c | 2 +-
 drivers/net/can/usb/peak_usb/pcan_usb_core.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
index b850ff8fe4bd..27b0a72fd885 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
@@ -57,7 +57,7 @@ MODULE_DEVICE_TABLE(usb, peak_usb_table);
  * dump memory
  */
 #define DUMP_WIDTH	16
-void pcan_dump_mem(char *prompt, void *p, int l)
+void pcan_dump_mem(const char *prompt, const void *p, int l)
 {
 	pr_info("%s dumping %s (%d bytes):\n",
 		PCAN_USB_DRIVER_NAME, prompt ? prompt : "memory", l);
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.h b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
index f60af573a2e0..9c90487b9c92 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_core.h
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.h
@@ -132,7 +132,7 @@ struct peak_usb_device {
 	struct peak_usb_device *next_siblings;
 };
 
-void pcan_dump_mem(char *prompt, void *p, int l);
+void pcan_dump_mem(const char *prompt, const void *p, int l);
 
 /* common timestamp management */
 void peak_usb_init_time_ref(struct peak_time_ref *time_ref,
-- 
2.35.1

[PATCH net-next 16/29] can: peak_usb: correction of an initially misnamed field name

[Marc Kleine-Budde]

From: Stephane Grosjean <s.grosjean@peak-system.com>

The data structure returned from the USB device contains a number
flashed by the user and not the serial number of the device.

Link: https://lore.kernel.org/all/20220719120632.26774-2-s.grosjean@peak-system.com
Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/peak_usb/pcan_usb_pro.c | 2 +-
 drivers/net/can/usb/peak_usb/pcan_usb_pro.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
index ebe087f258e3..457887113e75 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -439,7 +439,7 @@ static int pcan_usb_pro_get_device_id(struct peak_usb_device *dev,
 		return err;
 
 	pdn = (struct pcan_usb_pro_devid *)pc;
-	*device_id = le32_to_cpu(pdn->serial_num);
+	*device_id = le32_to_cpu(pdn->dev_num);
 
 	return err;
 }
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.h b/drivers/net/can/usb/peak_usb/pcan_usb_pro.h
index 5d4cf14eb9d9..a34e0fc021c9 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.h
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.h
@@ -112,7 +112,7 @@ struct __packed pcan_usb_pro_devid {
 	u8 data_type;
 	u8 channel;
 	__le16 dummy;
-	__le32 serial_num;
+	__le32 dev_num;
 };
 
 #define PCAN_USBPRO_LED_DEVICE		0x00
-- 
2.35.1

[PATCH net-next 17/29] can: peak_usb: include support for a new MCU

[Marc Kleine-Budde]

From: Stephane Grosjean <s.grosjean@peak-system.com>

The CANFD-USB PCAN-USB FD interface undergoes an internal component
change that requires a slight modification of its drivers, which leads
them to dynamically use endpoint numbers provided by the interface
itself. In addition to a change in the calls to the USB functions
exported by the kernel, the detection of the USB interface dedicated
to CAN must also be modified, as some PEAK-System devices support
other interfaces than CAN.

Link: https://lore.kernel.org/all/20220719120632.26774-3-s.grosjean@peak-system.com
Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
[mkl: add missing cpu_to_le16() conversion]
[mkl: fix networking block comment style]
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 68 ++++++++++++++++++----
 1 file changed, 58 insertions(+), 10 deletions(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index 65487ec33566..3d7e0e370505 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -33,6 +33,10 @@
 #define PCAN_UFD_RX_BUFFER_SIZE		2048
 #define PCAN_UFD_TX_BUFFER_SIZE		512
 
+/* struct pcan_ufd_fw_info::type */
+#define PCAN_USBFD_TYPE_STD		1
+#define PCAN_USBFD_TYPE_EXT		2	/* includes EP numbers */
+
 /* read some versions info from the hw device */
 struct __packed pcan_ufd_fw_info {
 	__le16	size_of;	/* sizeof this */
@@ -44,6 +48,13 @@ struct __packed pcan_ufd_fw_info {
 	__le32	dev_id[2];	/* "device id" per CAN */
 	__le32	ser_no;		/* S/N */
 	__le32	flags;		/* special functions */
+
+	/* extended data when type == PCAN_USBFD_TYPE_EXT */
+	u8	cmd_out_ep;	/* ep for cmd */
+	u8	cmd_in_ep;	/* ep for replies */
+	u8	data_out_ep[2];	/* ep for CANx TX */
+	u8	data_in_ep;	/* ep for CAN RX */
+	u8	dummy[3];
 };
 
 /* handle device specific info used by the netdevices */
@@ -171,6 +182,9 @@ static inline void *pcan_usb_fd_cmd_buffer(struct peak_usb_device *dev)
 /* send PCAN-USB Pro FD commands synchronously */
 static int pcan_usb_fd_send_cmd(struct peak_usb_device *dev, void *cmd_tail)
 {
+	struct pcan_usb_fd_device *pdev =
+		container_of(dev, struct pcan_usb_fd_device, dev);
+	struct pcan_ufd_fw_info *fw_info = &pdev->usb_if->fw_info;
 	void *cmd_head = pcan_usb_fd_cmd_buffer(dev);
 	int err = 0;
 	u8 *packet_ptr;
@@ -200,7 +214,7 @@ static int pcan_usb_fd_send_cmd(struct peak_usb_device *dev, void *cmd_tail)
 	do {
 		err = usb_bulk_msg(dev->udev,
 				   usb_sndbulkpipe(dev->udev,
-						   PCAN_USBPRO_EP_CMDOUT),
+						   fw_info->cmd_out_ep),
 				   packet_ptr, packet_len,
 				   NULL, PCAN_UFD_CMD_TIMEOUT_MS);
 		if (err) {
@@ -426,6 +440,9 @@ static int pcan_usb_fd_set_bittiming_fast(struct peak_usb_device *dev,
 static int pcan_usb_fd_restart_async(struct peak_usb_device *dev,
 				     struct urb *urb, u8 *buf)
 {
+	struct pcan_usb_fd_device *pdev =
+		container_of(dev, struct pcan_usb_fd_device, dev);
+	struct pcan_ufd_fw_info *fw_info = &pdev->usb_if->fw_info;
 	u8 *pc = buf;
 
 	/* build the entire cmds list in the provided buffer, to go back into
@@ -439,7 +456,7 @@ static int pcan_usb_fd_restart_async(struct peak_usb_device *dev,
 
 	/* complete the URB */
 	usb_fill_bulk_urb(urb, dev->udev,
-			  usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
+			  usb_sndbulkpipe(dev->udev, fw_info->cmd_out_ep),
 			  buf, pc - buf,
 			  pcan_usb_pro_restart_complete, dev);
 
@@ -839,6 +856,15 @@ static int pcan_usb_fd_get_berr_counter(const struct net_device *netdev,
 	return 0;
 }
 
+/* probe function for all PCAN-USB FD family usb interfaces */
+static int pcan_usb_fd_probe(struct usb_interface *intf)
+{
+	struct usb_host_interface *iface_desc = &intf->altsetting[0];
+
+	/* CAN interface is always interface #0 */
+	return iface_desc->desc.bInterfaceNumber;
+}
+
 /* stop interface (last chance before set bus off) */
 static int pcan_usb_fd_stop(struct peak_usb_device *dev)
 {
@@ -860,6 +886,7 @@ static int pcan_usb_fd_init(struct peak_usb_device *dev)
 {
 	struct pcan_usb_fd_device *pdev =
 			container_of(dev, struct pcan_usb_fd_device, dev);
+	struct pcan_ufd_fw_info *fw_info;
 	int i, err = -ENOMEM;
 
 	/* do this for 1st channel only */
@@ -878,10 +905,12 @@ static int pcan_usb_fd_init(struct peak_usb_device *dev)
 		/* number of ts msgs to ignore before taking one into account */
 		pdev->usb_if->cm_ignore_count = 5;
 
+		fw_info = &pdev->usb_if->fw_info;
+
 		err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
 					    PCAN_USBPRO_INFO_FW,
-					    &pdev->usb_if->fw_info,
-					    sizeof(pdev->usb_if->fw_info));
+					    fw_info,
+					    sizeof(*fw_info));
 		if (err) {
 			dev_err(dev->netdev->dev.parent,
 				"unable to read %s firmware info (err %d)\n",
@@ -895,14 +924,14 @@ static int pcan_usb_fd_init(struct peak_usb_device *dev)
 		 */
 		dev_info(dev->netdev->dev.parent,
 			 "PEAK-System %s v%u fw v%u.%u.%u (%u channels)\n",
-			 dev->adapter->name, pdev->usb_if->fw_info.hw_version,
-			 pdev->usb_if->fw_info.fw_version[0],
-			 pdev->usb_if->fw_info.fw_version[1],
-			 pdev->usb_if->fw_info.fw_version[2],
+			 dev->adapter->name, fw_info->hw_version,
+			 fw_info->fw_version[0],
+			 fw_info->fw_version[1],
+			 fw_info->fw_version[2],
 			 dev->adapter->ctrl_count);
 
 		/* check for ability to switch between ISO/non-ISO modes */
-		if (pdev->usb_if->fw_info.fw_version[0] >= 2) {
+		if (fw_info->fw_version[0] >= 2) {
 			/* firmware >= 2.x supports ISO/non-ISO switching */
 			dev->can.ctrlmode_supported |= CAN_CTRLMODE_FD_NON_ISO;
 		} else {
@@ -910,6 +939,14 @@ static int pcan_usb_fd_init(struct peak_usb_device *dev)
 			dev->can.ctrlmode |= CAN_CTRLMODE_FD_NON_ISO;
 		}
 
+		/* if vendor rsp is of type 2, then it contains EP numbers to
+		 * use for cmds pipes. If not, then default EP should be used.
+		 */
+		if (fw_info->type != cpu_to_le16(PCAN_USBFD_TYPE_EXT)) {
+			fw_info->cmd_out_ep = PCAN_USBPRO_EP_CMDOUT;
+			fw_info->cmd_in_ep = PCAN_USBPRO_EP_CMDIN;
+		}
+
 		/* tell the hardware the can driver is running */
 		err = pcan_usb_fd_drv_loaded(dev, 1);
 		if (err) {
@@ -930,12 +967,23 @@ static int pcan_usb_fd_init(struct peak_usb_device *dev)
 		/* do a copy of the ctrlmode[_supported] too */
 		dev->can.ctrlmode = ppdev->dev.can.ctrlmode;
 		dev->can.ctrlmode_supported = ppdev->dev.can.ctrlmode_supported;
+
+		fw_info = &pdev->usb_if->fw_info;
 	}
 
 	pdev->usb_if->dev[dev->ctrl_idx] = dev;
 	dev->device_number =
 		le32_to_cpu(pdev->usb_if->fw_info.dev_id[dev->ctrl_idx]);
 
+	/* if vendor rsp is of type 2, then it contains EP numbers to
+	 * use for data pipes. If not, then statically defined EP are used
+	 * (see peak_usb_create_dev()).
+	 */
+	if (fw_info->type == cpu_to_le16(PCAN_USBFD_TYPE_EXT)) {
+		dev->ep_msg_in = fw_info->data_in_ep;
+		dev->ep_msg_out = fw_info->data_out_ep[dev->ctrl_idx];
+	}
+
 	/* set clock domain */
 	for (i = 0; i < ARRAY_SIZE(pcan_usb_fd_clk_freq); i++)
 		if (dev->adapter->clock.freq == pcan_usb_fd_clk_freq[i])
@@ -1091,7 +1139,7 @@ const struct peak_usb_adapter pcan_usb_fd = {
 	.tx_buffer_size = PCAN_UFD_TX_BUFFER_SIZE,
 
 	/* device callbacks */
-	.intf_probe = pcan_usb_pro_probe,	/* same as PCAN-USB Pro */
+	.intf_probe = pcan_usb_fd_probe,
 	.dev_init = pcan_usb_fd_init,
 
 	.dev_exit = pcan_usb_fd_exit,
-- 
2.35.1

[PATCH net-next 18/29] can: pch_can: do not report txerr and rxerr during bus-off

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

During bus off, the error count is greater than 255 and can not fit in
a u8.

Fixes: 0c78ab76a05c ("pch_can: Add setting TEC/REC statistics processing")
Link: https://lore.kernel.org/all/20220719143550.3681-2-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/pch_can.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index fde3ac516d26..497ef77340ea 100644
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -496,6 +496,9 @@ static void pch_can_error(struct net_device *ndev, u32 status)
 		cf->can_id |= CAN_ERR_BUSOFF;
 		priv->can.can_stats.bus_off++;
 		can_bus_off(ndev);
+	} else {
+		cf->data[6] = errc & PCH_TEC;
+		cf->data[7] = (errc & PCH_REC) >> 8;
 	}
 
 	errc = ioread32(&priv->regs->errc);
@@ -556,9 +559,6 @@ static void pch_can_error(struct net_device *ndev, u32 status)
 		break;
 	}
 
-	cf->data[6] = errc & PCH_TEC;
-	cf->data[7] = (errc & PCH_REC) >> 8;
-
 	priv->can.state = state;
 	netif_receive_skb(skb);
 }
-- 
2.35.1

[PATCH net-next 19/29] can: rcar_can: do not report txerr and rxerr during bus-off

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

During bus off, the error count is greater than 255 and can not fit in
a u8.

Fixes: fd1159318e55 ("can: add Renesas R-Car CAN driver")
Link: https://lore.kernel.org/all/20220719143550.3681-3-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/rcar/rcar_can.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c
index d45762f1cf6b..24d7a71def6a 100644
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c
@@ -232,11 +232,8 @@ static void rcar_can_error(struct net_device *ndev)
 	if (eifr & (RCAR_CAN_EIFR_EWIF | RCAR_CAN_EIFR_EPIF)) {
 		txerr = readb(&priv->regs->tecr);
 		rxerr = readb(&priv->regs->recr);
-		if (skb) {
+		if (skb)
 			cf->can_id |= CAN_ERR_CRTL;
-			cf->data[6] = txerr;
-			cf->data[7] = rxerr;
-		}
 	}
 	if (eifr & RCAR_CAN_EIFR_BEIF) {
 		int rx_errors = 0, tx_errors = 0;
@@ -336,6 +333,9 @@ static void rcar_can_error(struct net_device *ndev)
 		can_bus_off(ndev);
 		if (skb)
 			cf->can_id |= CAN_ERR_BUSOFF;
+	} else if (skb) {
+		cf->data[6] = txerr;
+		cf->data[7] = rxerr;
 	}
 	if (eifr & RCAR_CAN_EIFR_ORIF) {
 		netdev_dbg(priv->ndev, "Receive overrun error interrupt\n");
-- 
2.35.1

[PATCH net-next 20/29] can: sja1000: do not report txerr and rxerr during bus-off

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

During bus off, the error count is greater than 255 and can not fit in
a u8.

Fixes: 215db1856e83 ("can: sja1000: Consolidate and unify state change handling")
Link: https://lore.kernel.org/all/20220719143550.3681-4-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/sja1000/sja1000.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index d9da471f1bb9..74bff5092b47 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -404,9 +404,6 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 	txerr = priv->read_reg(priv, SJA1000_TXERR);
 	rxerr = priv->read_reg(priv, SJA1000_RXERR);
 
-	cf->data[6] = txerr;
-	cf->data[7] = rxerr;
-
 	if (isrc & IRQ_DOI) {
 		/* data overrun interrupt */
 		netdev_dbg(dev, "data overrun interrupt\n");
@@ -428,6 +425,10 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 		else
 			state = CAN_STATE_ERROR_ACTIVE;
 	}
+	if (state != CAN_STATE_BUS_OFF) {
+		cf->data[6] = txerr;
+		cf->data[7] = rxerr;
+	}
 	if (isrc & IRQ_BEI) {
 		/* bus error interrupt */
 		priv->can.can_stats.bus_error++;
-- 
2.35.1

[PATCH net-next 21/29] can: slcan: do not report txerr and rxerr during bus-off

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

During bus off, the error count is greater than 255 and can not fit in
a u8.

alloc_can_err_skb() already sets cf to NULL if the allocation fails [1],
so the redundant cf = NULL assignment gets removed.

[1] https://elixir.bootlin.com/linux/latest/source/drivers/net/can/dev/skb.c#L187

Fixes: 0a9cdcf098a4 ("can: slcan: extend the protocol with CAN state info")
Link: https://lore.kernel.org/all/20220719143550.3681-5-mailhol.vincent@wanadoo.fr
CC: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/slcan/slcan-core.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index 057b211f3e7f..dfd1baba4130 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -306,19 +306,17 @@ static void slc_bump_state(struct slcan *sl)
 		return;
 
 	skb = alloc_can_err_skb(dev, &cf);
-	if (skb) {
-		cf->data[6] = txerr;
-		cf->data[7] = rxerr;
-	} else {
-		cf = NULL;
-	}
 
 	tx_state = txerr >= rxerr ? state : 0;
 	rx_state = txerr <= rxerr ? state : 0;
 	can_change_state(dev, cf, tx_state, rx_state);
 
-	if (state == CAN_STATE_BUS_OFF)
+	if (state == CAN_STATE_BUS_OFF) {
 		can_bus_off(dev);
+	} else if (skb) {
+		cf->data[6] = txerr;
+		cf->data[7] = rxerr;
+	}
 
 	if (skb)
 		netif_rx(skb);
-- 
2.35.1

[PATCH net-next 22/29] can: hi311x: do not report txerr and rxerr during bus-off

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

During bus off, the error count is greater than 255 and can not fit in
a u8.

Fixes: 57e83fb9b746 ("can: hi311x: Add Holt HI-311x CAN driver")
Link: https://lore.kernel.org/all/20220719143550.3681-6-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/spi/hi311x.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/spi/hi311x.c b/drivers/net/can/spi/hi311x.c
index ebc4ebb44c98..bfb7c4bb5bc3 100644
--- a/drivers/net/can/spi/hi311x.c
+++ b/drivers/net/can/spi/hi311x.c
@@ -667,8 +667,6 @@ static irqreturn_t hi3110_can_ist(int irq, void *dev_id)
 
 			txerr = hi3110_read(spi, HI3110_READ_TEC);
 			rxerr = hi3110_read(spi, HI3110_READ_REC);
-			cf->data[6] = txerr;
-			cf->data[7] = rxerr;
 			tx_state = txerr >= rxerr ? new_state : 0;
 			rx_state = txerr <= rxerr ? new_state : 0;
 			can_change_state(net, cf, tx_state, rx_state);
@@ -681,6 +679,9 @@ static irqreturn_t hi3110_can_ist(int irq, void *dev_id)
 					hi3110_hw_sleep(spi);
 					break;
 				}
+			} else {
+				cf->data[6] = txerr;
+				cf->data[7] = rxerr;
 			}
 		}
 
-- 
2.35.1

[PATCH net-next 23/29] can: sun4i_can: do not report txerr and rxerr during bus-off

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

During bus off, the error count is greater than 255 and can not fit in
a u8.

Fixes: 0738eff14d81 ("can: Allwinner A10/A20 CAN Controller support - Kernel module")
Link: https://lore.kernel.org/all/20220719143550.3681-7-mailhol.vincent@wanadoo.fr
CC: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/sun4i_can.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/can/sun4i_can.c b/drivers/net/can/sun4i_can.c
index 155b90f6c767..afe9b541f037 100644
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c
@@ -535,11 +535,6 @@ static int sun4i_can_err(struct net_device *dev, u8 isrc, u8 status)
 	rxerr = (errc >> 16) & 0xFF;
 	txerr = errc & 0xFF;
 
-	if (skb) {
-		cf->data[6] = txerr;
-		cf->data[7] = rxerr;
-	}
-
 	if (isrc & SUN4I_INT_DATA_OR) {
 		/* data overrun interrupt */
 		netdev_dbg(dev, "data overrun interrupt\n");
@@ -570,6 +565,10 @@ static int sun4i_can_err(struct net_device *dev, u8 isrc, u8 status)
 		else
 			state = CAN_STATE_ERROR_ACTIVE;
 	}
+	if (skb && state != CAN_STATE_BUS_OFF) {
+		cf->data[6] = txerr;
+		cf->data[7] = rxerr;
+	}
 	if (isrc & SUN4I_INT_BUS_ERR) {
 		/* bus error interrupt */
 		netdev_dbg(dev, "bus error interrupt\n");
-- 
2.35.1

[PATCH net-next 24/29] can: kvaser_usb_hydra: do not report txerr and rxerr during bus-off

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

During bus off, the error count is greater than 255 and can not fit in
a u8.

Fixes: aec5fb2268b7 ("can: kvaser_usb: Add support for Kvaser USB hydra family")
Link: https://lore.kernel.org/all/20220719143550.3681-8-mailhol.vincent@wanadoo.fr
CC: Jimmy Assarsson <extja@kvaser.com>
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
index 5d70844ac030..404093468b2f 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
@@ -917,8 +917,10 @@ static void kvaser_usb_hydra_update_state(struct kvaser_usb_net_priv *priv,
 	    new_state < CAN_STATE_BUS_OFF)
 		priv->can.can_stats.restarts++;
 
-	cf->data[6] = bec->txerr;
-	cf->data[7] = bec->rxerr;
+	if (new_state != CAN_STATE_BUS_OFF) {
+		cf->data[6] = bec->txerr;
+		cf->data[7] = bec->rxerr;
+	}
 
 	netif_rx(skb);
 }
@@ -1069,8 +1071,10 @@ kvaser_usb_hydra_error_frame(struct kvaser_usb_net_priv *priv,
 	shhwtstamps->hwtstamp = hwtstamp;
 
 	cf->can_id |= CAN_ERR_BUSERROR;
-	cf->data[6] = bec.txerr;
-	cf->data[7] = bec.rxerr;
+	if (new_state != CAN_STATE_BUS_OFF) {
+		cf->data[6] = bec.txerr;
+		cf->data[7] = bec.rxerr;
+	}
 
 	netif_rx(skb);
 
-- 
2.35.1

[PATCH net-next 25/29] can: kvaser_usb_leaf: do not report txerr and rxerr during bus-off

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

During bus off, the error count is greater than 255 and can not fit in
a u8.

Fixes: 7259124eac7d1 ("can: kvaser_usb: Split driver into kvaser_usb_core.c and kvaser_usb_leaf.c")
Link: https://lore.kernel.org/all/20220719143550.3681-9-mailhol.vincent@wanadoo.fr
CC: Jimmy Assarsson <extja@kvaser.com>
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
index cc809ecd1e62..f551fde16a70 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -853,8 +853,10 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
 		break;
 	}
 
-	cf->data[6] = es->txerr;
-	cf->data[7] = es->rxerr;
+	if (new_state != CAN_STATE_BUS_OFF) {
+		cf->data[6] = es->txerr;
+		cf->data[7] = es->rxerr;
+	}
 
 	netif_rx(skb);
 }
-- 
2.35.1

[PATCH net-next 26/29] can: usb_8dev: do not report txerr and rxerr during bus-off

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

During bus off, the error count is greater than 255 and can not fit in
a u8.

Fixes: 0024d8ad1639 ("can: usb_8dev: Add support for USB2CAN interface from 8 devices")
Link: https://lore.kernel.org/all/20220719143550.3681-10-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/usb/usb_8dev.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
index f3363575bf32..4d38dc90472a 100644
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -438,9 +438,10 @@ static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv,
 
 	if (rx_errors)
 		stats->rx_errors++;
-
-	cf->data[6] = txerr;
-	cf->data[7] = rxerr;
+	if (priv->can.state != CAN_STATE_BUS_OFF) {
+		cf->data[6] = txerr;
+		cf->data[7] = rxerr;
+	}
 
 	priv->bec.txerr = txerr;
 	priv->bec.rxerr = rxerr;
-- 
2.35.1

[PATCH net-next 27/29] can: error: specify the values of data[5..7] of CAN error frames

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

Currently, data[5..7] of struct can_frame, when used as a CAN error
frame, are defined as being "controller specific". Device specific
behaviours are problematic because it prevents someone from writing
code which is portable between devices.

As a matter of fact, data[5] is never used, data[6] is always used to
report TX error counter and data[7] is always used to report RX error
counter. can-utils also relies on this.

This patch updates the comment in the uapi header to specify that
data[5] is reserved (and thus should not be used) and that data[6..7]
are used for error counters.

Fixes: 0d66548a10cb ("[CAN]: Add PF_CAN core module")
Link: https://lore.kernel.org/all/20220719143550.3681-11-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 include/uapi/linux/can/error.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/can/error.h b/include/uapi/linux/can/error.h
index 34633283de64..a1000cb63063 100644
--- a/include/uapi/linux/can/error.h
+++ b/include/uapi/linux/can/error.h
@@ -120,6 +120,9 @@
 #define CAN_ERR_TRX_CANL_SHORT_TO_GND  0x70 /* 0111 0000 */
 #define CAN_ERR_TRX_CANL_SHORT_TO_CANH 0x80 /* 1000 0000 */
 
-/* controller specific additional information / data[5..7] */
+/* data[5] is reserved (do not use) */
+
+/* TX error counter / data[6] */
+/* RX error counter / data[7] */
 
 #endif /* _UAPI_CAN_ERROR_H */
-- 
2.35.1

[PATCH net-next 28/29] can: add CAN_ERR_CNT flag to notify availability of error counter

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

Add a dedicated flag in uapi/linux/can/error.h to notify the userland
that fields data[6] and data[7] of the CAN error frame were
respectively populated with the tx and rx error counters.

For all driver tree-wide, set up this flags whenever needed.

Link: https://lore.kernel.org/all/20220719143550.3681-12-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 drivers/net/can/c_can/c_can_main.c                | 6 +++---
 drivers/net/can/cc770/cc770.c                     | 1 +
 drivers/net/can/ctucanfd/ctucanfd_base.c          | 5 +++--
 drivers/net/can/grcan.c                           | 1 +
 drivers/net/can/ifi_canfd/ifi_canfd.c             | 4 ++--
 drivers/net/can/janz-ican3.c                      | 4 ++--
 drivers/net/can/kvaser_pciefd.c                   | 2 +-
 drivers/net/can/m_can/m_can.c                     | 4 ++--
 drivers/net/can/pch_can.c                         | 1 +
 drivers/net/can/peak_canfd/peak_canfd.c           | 6 +++---
 drivers/net/can/rcar/rcar_can.c                   | 1 +
 drivers/net/can/rcar/rcar_canfd.c                 | 4 ++--
 drivers/net/can/sja1000/sja1000.c                 | 1 +
 drivers/net/can/slcan/slcan-core.c                | 1 +
 drivers/net/can/spi/hi311x.c                      | 1 +
 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c    | 1 +
 drivers/net/can/sun4i_can.c                       | 1 +
 drivers/net/can/ti_hecc.c                         | 1 +
 drivers/net/can/usb/esd_usb.c                     | 3 ++-
 drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c | 2 ++
 drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c  | 1 +
 drivers/net/can/usb/peak_usb/pcan_usb.c           | 1 +
 drivers/net/can/usb/usb_8dev.c                    | 1 +
 drivers/net/can/xilinx_can.c                      | 1 +
 include/uapi/linux/can/error.h                    | 2 ++
 25 files changed, 38 insertions(+), 18 deletions(-)

diff --git a/drivers/net/can/c_can/c_can_main.c b/drivers/net/can/c_can/c_can_main.c
index ed4db4cf8716..de38d8f7b5f7 100644
--- a/drivers/net/can/c_can/c_can_main.c
+++ b/drivers/net/can/c_can/c_can_main.c
@@ -952,14 +952,14 @@ static int c_can_handle_state_change(struct net_device *dev,
 
 	switch (error_type) {
 	case C_CAN_NO_ERROR:
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = CAN_ERR_CRTL_ACTIVE;
 		cf->data[6] = bec.txerr;
 		cf->data[7] = bec.rxerr;
 		break;
 	case C_CAN_ERROR_WARNING:
 		/* error warning state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = (bec.txerr > bec.rxerr) ?
 			CAN_ERR_CRTL_TX_WARNING :
 			CAN_ERR_CRTL_RX_WARNING;
@@ -969,7 +969,7 @@ static int c_can_handle_state_change(struct net_device *dev,
 		break;
 	case C_CAN_ERROR_PASSIVE:
 		/* error passive state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		if (rx_err_passive)
 			cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
 		if (bec.txerr > 127)
diff --git a/drivers/net/can/cc770/cc770.c b/drivers/net/can/cc770/cc770.c
index bb7224cfc6ab..797a954bb1a0 100644
--- a/drivers/net/can/cc770/cc770.c
+++ b/drivers/net/can/cc770/cc770.c
@@ -512,6 +512,7 @@ static int cc770_err(struct net_device *dev, u8 status)
 
 	/* Use extended functions of the CC770 */
 	if (priv->control_normal_mode & CTRL_EAF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = cc770_read_reg(priv, tx_error_counter);
 		cf->data[7] = cc770_read_reg(priv, rx_error_counter);
 	}
diff --git a/drivers/net/can/ctucanfd/ctucanfd_base.c b/drivers/net/can/ctucanfd/ctucanfd_base.c
index 14ac7c0ee04c..6b281f6eb9b4 100644
--- a/drivers/net/can/ctucanfd/ctucanfd_base.c
+++ b/drivers/net/can/ctucanfd/ctucanfd_base.c
@@ -847,7 +847,7 @@ static void ctucan_err_interrupt(struct net_device *ndev, u32 isr)
 		case CAN_STATE_ERROR_PASSIVE:
 			priv->can.can_stats.error_passive++;
 			if (skb) {
-				cf->can_id |= CAN_ERR_CRTL;
+				cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 				cf->data[1] = (bec.rxerr > 127) ?
 						CAN_ERR_CRTL_RX_PASSIVE :
 						CAN_ERR_CRTL_TX_PASSIVE;
@@ -858,7 +858,7 @@ static void ctucan_err_interrupt(struct net_device *ndev, u32 isr)
 		case CAN_STATE_ERROR_WARNING:
 			priv->can.can_stats.error_warning++;
 			if (skb) {
-				cf->can_id |= CAN_ERR_CRTL;
+				cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 				cf->data[1] |= (bec.txerr > bec.rxerr) ?
 					CAN_ERR_CRTL_TX_WARNING :
 					CAN_ERR_CRTL_RX_WARNING;
@@ -867,6 +867,7 @@ static void ctucan_err_interrupt(struct net_device *ndev, u32 isr)
 			}
 			break;
 		case CAN_STATE_ERROR_ACTIVE:
+			cf->can_id |= CAN_ERR_CNT;
 			cf->data[1] = CAN_ERR_CRTL_ACTIVE;
 			cf->data[6] = bec.txerr;
 			cf->data[7] = bec.rxerr;
diff --git a/drivers/net/can/grcan.c b/drivers/net/can/grcan.c
index 4c47c1055eff..24035a6187c9 100644
--- a/drivers/net/can/grcan.c
+++ b/drivers/net/can/grcan.c
@@ -671,6 +671,7 @@ static void grcan_err(struct net_device *dev, u32 sources, u32 status)
 				/* There are no others at this point */
 				break;
 			}
+			cf.can_id |= CAN_ERR_CNT;
 			cf.data[6] = txerr;
 			cf.data[7] = rxerr;
 			priv->can.state = state;
diff --git a/drivers/net/can/ifi_canfd/ifi_canfd.c b/drivers/net/can/ifi_canfd/ifi_canfd.c
index 968ed6d7316b..64e3be8b73af 100644
--- a/drivers/net/can/ifi_canfd/ifi_canfd.c
+++ b/drivers/net/can/ifi_canfd/ifi_canfd.c
@@ -492,7 +492,7 @@ static int ifi_canfd_handle_state_change(struct net_device *ndev,
 	switch (new_state) {
 	case CAN_STATE_ERROR_WARNING:
 		/* error warning state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = (bec.txerr > bec.rxerr) ?
 			CAN_ERR_CRTL_TX_WARNING :
 			CAN_ERR_CRTL_RX_WARNING;
@@ -501,7 +501,7 @@ static int ifi_canfd_handle_state_change(struct net_device *ndev,
 		break;
 	case CAN_STATE_ERROR_PASSIVE:
 		/* error passive state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
 		if (bec.txerr > 127)
 			cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
index 35bfb82d6929..ccb5c5405224 100644
--- a/drivers/net/can/janz-ican3.c
+++ b/drivers/net/can/janz-ican3.c
@@ -1127,7 +1127,7 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 	/* bus error interrupt */
 	if (isrc == CEVTIND_BEI) {
 		mod->can.can_stats.bus_error++;
-		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR | CAN_ERR_CNT;
 
 		switch (ecc & ECC_MASK) {
 		case ECC_BIT:
@@ -1153,7 +1153,7 @@ static int ican3_handle_cevtind(struct ican3_dev *mod, struct ican3_msg *msg)
 
 	if (state != mod->can.state && (state == CAN_STATE_ERROR_WARNING ||
 					state == CAN_STATE_ERROR_PASSIVE)) {
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		if (state == CAN_STATE_ERROR_WARNING) {
 			mod->can.can_stats.error_warning++;
 			cf->data[1] = (txerr > rxerr) ?
diff --git a/drivers/net/can/kvaser_pciefd.c b/drivers/net/can/kvaser_pciefd.c
index 017f2d36ffc3..dcd2c9d50d5e 100644
--- a/drivers/net/can/kvaser_pciefd.c
+++ b/drivers/net/can/kvaser_pciefd.c
@@ -1306,7 +1306,7 @@ static int kvaser_pciefd_rx_error_frame(struct kvaser_pciefd_can *can,
 	shhwtstamps->hwtstamp =
 		ns_to_ktime(div_u64(p->timestamp * 1000,
 				    can->kv_pcie->freq_to_ticks_div));
-	cf->can_id |= CAN_ERR_BUSERROR;
+	cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_CNT;
 
 	cf->data[6] = bec.txerr;
 	cf->data[7] = bec.rxerr;
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index afaaeb610c00..713a4b0edf86 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -741,7 +741,7 @@ static int m_can_handle_state_change(struct net_device *dev,
 	switch (new_state) {
 	case CAN_STATE_ERROR_WARNING:
 		/* error warning state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = (bec.txerr > bec.rxerr) ?
 			CAN_ERR_CRTL_TX_WARNING :
 			CAN_ERR_CRTL_RX_WARNING;
@@ -750,7 +750,7 @@ static int m_can_handle_state_change(struct net_device *dev,
 		break;
 	case CAN_STATE_ERROR_PASSIVE:
 		/* error passive state */
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		ecr = m_can_read(cdev, M_CAN_ECR);
 		if (ecr & ECR_RP)
 			cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index 497ef77340ea..50f6719b3aa4 100644
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -497,6 +497,7 @@ static void pch_can_error(struct net_device *ndev, u32 status)
 		priv->can.can_stats.bus_off++;
 		can_bus_off(ndev);
 	} else {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = errc & PCH_TEC;
 		cf->data[7] = (errc & PCH_REC) >> 8;
 	}
diff --git a/drivers/net/can/peak_canfd/peak_canfd.c b/drivers/net/can/peak_canfd/peak_canfd.c
index b2dea360813d..afb9adb3d5c2 100644
--- a/drivers/net/can/peak_canfd/peak_canfd.c
+++ b/drivers/net/can/peak_canfd/peak_canfd.c
@@ -373,7 +373,7 @@ static int pucan_handle_status(struct peak_canfd_priv *priv,
 		priv->can.state = CAN_STATE_ERROR_PASSIVE;
 		priv->can.can_stats.error_passive++;
 		if (skb) {
-			cf->can_id |= CAN_ERR_CRTL;
+			cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 			cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
 					CAN_ERR_CRTL_TX_PASSIVE :
 					CAN_ERR_CRTL_RX_PASSIVE;
@@ -386,7 +386,7 @@ static int pucan_handle_status(struct peak_canfd_priv *priv,
 		priv->can.state = CAN_STATE_ERROR_WARNING;
 		priv->can.can_stats.error_warning++;
 		if (skb) {
-			cf->can_id |= CAN_ERR_CRTL;
+			cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 			cf->data[1] = (priv->bec.txerr > priv->bec.rxerr) ?
 					CAN_ERR_CRTL_TX_WARNING :
 					CAN_ERR_CRTL_RX_WARNING;
@@ -430,7 +430,7 @@ static int pucan_handle_cache_critical(struct peak_canfd_priv *priv)
 		return -ENOMEM;
 	}
 
-	cf->can_id |= CAN_ERR_CRTL;
+	cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 	cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
 
 	cf->data[6] = priv->bec.txerr;
diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c
index 24d7a71def6a..d11db2112a4a 100644
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c
@@ -334,6 +334,7 @@ static void rcar_can_error(struct net_device *ndev)
 		if (skb)
 			cf->can_id |= CAN_ERR_BUSOFF;
 	} else if (skb) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}
diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index ba42cef10a53..e3382284e172 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -1052,7 +1052,7 @@ static void rcar_canfd_error(struct net_device *ndev, u32 cerfl,
 		netdev_dbg(ndev, "Error warning interrupt\n");
 		priv->can.state = CAN_STATE_ERROR_WARNING;
 		priv->can.can_stats.error_warning++;
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_WARNING :
 			CAN_ERR_CRTL_RX_WARNING;
 		cf->data[6] = txerr;
@@ -1062,7 +1062,7 @@ static void rcar_canfd_error(struct net_device *ndev, u32 cerfl,
 		netdev_dbg(ndev, "Error passive interrupt\n");
 		priv->can.state = CAN_STATE_ERROR_PASSIVE;
 		priv->can.can_stats.error_passive++;
-		cf->can_id |= CAN_ERR_CRTL;
+		cf->can_id |= CAN_ERR_CRTL | CAN_ERR_CNT;
 		cf->data[1] = txerr > rxerr ? CAN_ERR_CRTL_TX_PASSIVE :
 			CAN_ERR_CRTL_RX_PASSIVE;
 		cf->data[6] = txerr;
diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 74bff5092b47..75a2f9bf8c16 100644
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -426,6 +426,7 @@ static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
 			state = CAN_STATE_ERROR_ACTIVE;
 	}
 	if (state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}
diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index dfd1baba4130..dc28e715bbe1 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -314,6 +314,7 @@ static void slc_bump_state(struct slcan *sl)
 	if (state == CAN_STATE_BUS_OFF) {
 		can_bus_off(dev);
 	} else if (skb) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}
diff --git a/drivers/net/can/spi/hi311x.c b/drivers/net/can/spi/hi311x.c
index bfb7c4bb5bc3..167114aae6dd 100644
--- a/drivers/net/can/spi/hi311x.c
+++ b/drivers/net/can/spi/hi311x.c
@@ -680,6 +680,7 @@ static irqreturn_t hi3110_can_ist(int irq, void *dev_id)
 					break;
 				}
 			} else {
+				cf->can_id |= CAN_ERR_CNT;
 				cf->data[6] = txerr;
 				cf->data[7] = rxerr;
 			}
diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
index 9b47b07162fe..f4e174cadd4e 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@@ -1099,6 +1099,7 @@ static int mcp251xfd_handle_cerrif(struct mcp251xfd_priv *priv)
 		err = mcp251xfd_get_berr_counter(priv->ndev, &bec);
 		if (err)
 			return err;
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = bec.txerr;
 		cf->data[7] = bec.rxerr;
 	}
diff --git a/drivers/net/can/sun4i_can.c b/drivers/net/can/sun4i_can.c
index afe9b541f037..b90dfb429ccd 100644
--- a/drivers/net/can/sun4i_can.c
+++ b/drivers/net/can/sun4i_can.c
@@ -566,6 +566,7 @@ static int sun4i_can_err(struct net_device *dev, u8 isrc, u8 status)
 			state = CAN_STATE_ERROR_ACTIVE;
 	}
 	if (skb && state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}
diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index debe17bfd0f0..afa38771520e 100644
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -662,6 +662,7 @@ static void ti_hecc_change_state(struct net_device *ndev,
 	can_change_state(priv->ndev, cf, tx_state, rx_state);
 
 	if (max(tx_state, rx_state) != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = hecc_read(priv, HECC_CANTEC);
 		cf->data[7] = hecc_read(priv, HECC_CANREC);
 	}
diff --git a/drivers/net/can/usb/esd_usb.c b/drivers/net/can/usb/esd_usb.c
index 8a4bf2961f3d..177ed33e08d9 100644
--- a/drivers/net/can/usb/esd_usb.c
+++ b/drivers/net/can/usb/esd_usb.c
@@ -265,7 +265,8 @@ static void esd_usb_rx_event(struct esd_usb_net_priv *priv,
 			priv->can.can_stats.bus_error++;
 			stats->rx_errors++;
 
-			cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+			cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR |
+				      CAN_ERR_CNT;
 
 			switch (ecc & SJA1000_ECC_MASK) {
 			case SJA1000_ECC_BIT:
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
index 404093468b2f..dd65c101bfb8 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
@@ -918,6 +918,7 @@ static void kvaser_usb_hydra_update_state(struct kvaser_usb_net_priv *priv,
 		priv->can.can_stats.restarts++;
 
 	if (new_state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = bec->txerr;
 		cf->data[7] = bec->rxerr;
 	}
@@ -1072,6 +1073,7 @@ kvaser_usb_hydra_error_frame(struct kvaser_usb_net_priv *priv,
 
 	cf->can_id |= CAN_ERR_BUSERROR;
 	if (new_state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = bec.txerr;
 		cf->data[7] = bec.rxerr;
 	}
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
index f551fde16a70..07f687f29b34 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -854,6 +854,7 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
 	}
 
 	if (new_state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = es->txerr;
 		cf->data[7] = es->rxerr;
 	}
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb.c b/drivers/net/can/usb/peak_usb/pcan_usb.c
index 091c631ebe23..d07b7ee79e3e 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb.c
@@ -506,6 +506,7 @@ static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n,
 			/* Supply TX/RX error counters in case of
 			 * controller error.
 			 */
+			cf->can_id = CAN_ERR_CNT;
 			cf->data[6] = mc->pdev->bec.txerr;
 			cf->data[7] = mc->pdev->bec.rxerr;
 		}
diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
index 4d38dc90472a..8b7cd69e20b0 100644
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -439,6 +439,7 @@ static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv,
 	if (rx_errors)
 		stats->rx_errors++;
 	if (priv->can.state != CAN_STATE_BUS_OFF) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}
diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
index 0de2f97d9f62..caa6b4cee63f 100644
--- a/drivers/net/can/xilinx_can.c
+++ b/drivers/net/can/xilinx_can.c
@@ -965,6 +965,7 @@ static void xcan_set_error_state(struct net_device *ndev,
 	can_change_state(ndev, cf, tx_state, rx_state);
 
 	if (cf) {
+		cf->can_id |= CAN_ERR_CNT;
 		cf->data[6] = txerr;
 		cf->data[7] = rxerr;
 	}
diff --git a/include/uapi/linux/can/error.h b/include/uapi/linux/can/error.h
index a1000cb63063..b7c3efd9ff99 100644
--- a/include/uapi/linux/can/error.h
+++ b/include/uapi/linux/can/error.h
@@ -57,6 +57,8 @@
 #define CAN_ERR_BUSOFF       0x00000040U /* bus off */
 #define CAN_ERR_BUSERROR     0x00000080U /* bus error (may flood!) */
 #define CAN_ERR_RESTARTED    0x00000100U /* controller restarted */
+#define CAN_ERR_CNT          0x00000200U /* TX error counter / data[6] */
+					 /* RX error counter / data[7] */
 
 /* arbitration lost in bit ... / data[0] */
 #define CAN_ERR_LOSTARB_UNSPEC   0x00 /* unspecified */
-- 
2.35.1

[PATCH net-next 29/29] can: error: add definitions for the different CAN error thresholds

[Marc Kleine-Budde]

From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

Currently, drivers are using magic numbers to derive the CAN error
states from the error counter. Add three macro declarations to
remediate this.

For reference, the error-active, error-passive and bus-off are defined
in ISO 11898, section 12.1.4.2 "Error counting". Although ISO 11898
does not define error-warning state, this extra value is also commonly
used and is thus also added.

Link: https://lore.kernel.org/all/20220719143550.3681-13-mailhol.vincent@wanadoo.fr
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 include/uapi/linux/can/error.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/uapi/linux/can/error.h b/include/uapi/linux/can/error.h
index b7c3efd9ff99..acc1ac393d2a 100644
--- a/include/uapi/linux/can/error.h
+++ b/include/uapi/linux/can/error.h
@@ -127,4 +127,17 @@
 /* TX error counter / data[6] */
 /* RX error counter / data[7] */
 
+/* CAN state thresholds
+ *
+ * Error counter	Error state
+ * -----------------------------------
+ * 0 -  95		Error-active
+ * 96 - 127		Error-warning
+ * 128 - 255		Error-passive
+ * 256 and greater	Bus-off
+ */
+#define CAN_ERROR_WARNING_THRESHOLD 96
+#define CAN_ERROR_PASSIVE_THRESHOLD 128
+#define CAN_BUS_OFF_THRESHOLD 256
+
 #endif /* _UAPI_CAN_ERROR_H */
-- 
2.35.1

Re: [PATCH net-next 01/29] can: slcan: use scnprintf() as a hardening measure

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by Marc Kleine-Budde <mkl@pengutronix.de>:

On Wed, 20 Jul 2022 10:10:06 +0200 you wrote:
> From: Dan Carpenter <dan.carpenter@oracle.com>
> 
> The snprintf() function returns the number of bytes which *would* have
> been copied if there were no space. So, since this code does not check
> the return value, there if the buffer was not large enough then there
> would be a buffer overflow two lines later when it does:
> 
> [...]

Here is the summary with links:
  - [net-next,01/29] can: slcan: use scnprintf() as a hardening measure
    https://git.kernel.org/netdev/net-next/c/0159a9305d40
  - [net-next,02/29] can: slcan: convert comments to network style comments
    https://git.kernel.org/netdev/net-next/c/71f3a4cc740a
  - [net-next,03/29] can: slcan: slcan_init() convert printk(LEVEL ...) to pr_level()
    https://git.kernel.org/netdev/net-next/c/ded5fa885b2d
  - [net-next,04/29] can: slcan: fix whitespace issues
    https://git.kernel.org/netdev/net-next/c/f07d9e3c849b
  - [net-next,05/29] can: slcan: convert comparison to NULL into !val
    https://git.kernel.org/netdev/net-next/c/69a6539632dd
  - [net-next,06/29] can: slcan: clean up if/else
    https://git.kernel.org/netdev/net-next/c/18de712a5802
  - [net-next,07/29] dt-bindings: can: sja1000: Convert to json-schema
    https://git.kernel.org/netdev/net-next/c/f6b8061db9af
  - [net-next,08/29] dt-bindings: can: nxp,sja1000: Document RZ/N1{D,S} support
    https://git.kernel.org/netdev/net-next/c/4591c760b797
  - [net-next,09/29] can: sja1000: Add Quirk for RZ/N1 SJA1000 CAN controller
    https://git.kernel.org/netdev/net-next/c/2d99bfbf3386
  - [net-next,10/29] can: sja1000: Use device_get_match_data to get device data
    https://git.kernel.org/netdev/net-next/c/63ab1b63695e
  - [net-next,11/29] can: sja1000: Change the return type as void for SoC specific init
    https://git.kernel.org/netdev/net-next/c/6d5fe10796bb
  - [net-next,12/29] can: slcan: do not sleep with a spin lock held
    https://git.kernel.org/netdev/net-next/c/c6887023268e
  - [net-next,13/29] can: c_can: remove wrong comment
    https://git.kernel.org/netdev/net-next/c/4940eb51fc49
  - [net-next,14/29] can: ctucanfd: Update CTU CAN FD IP core registers to match version 3.x.
    https://git.kernel.org/netdev/net-next/c/9e7c9b8eb719
  - [net-next,15/29] can: peak_usb: pcan_dump_mem(): mark input prompt and data pointer as const
    https://git.kernel.org/netdev/net-next/c/92505df464ff
  - [net-next,16/29] can: peak_usb: correction of an initially misnamed field name
    https://git.kernel.org/netdev/net-next/c/a0cf2fe6cf2e
  - [net-next,17/29] can: peak_usb: include support for a new MCU
    https://git.kernel.org/netdev/net-next/c/4f232482467a
  - [net-next,18/29] can: pch_can: do not report txerr and rxerr during bus-off
    https://git.kernel.org/netdev/net-next/c/3a5c7e4611dd
  - [net-next,19/29] can: rcar_can: do not report txerr and rxerr during bus-off
    https://git.kernel.org/netdev/net-next/c/a37b7245e831
  - [net-next,20/29] can: sja1000: do not report txerr and rxerr during bus-off
    https://git.kernel.org/netdev/net-next/c/164d7cb2d5a3
  - [net-next,21/29] can: slcan: do not report txerr and rxerr during bus-off
    https://git.kernel.org/netdev/net-next/c/ce0e7aeb676b
  - [net-next,22/29] can: hi311x: do not report txerr and rxerr during bus-off
    https://git.kernel.org/netdev/net-next/c/a22bd630cfff
  - [net-next,23/29] can: sun4i_can: do not report txerr and rxerr during bus-off
    https://git.kernel.org/netdev/net-next/c/0ac15a8f661b
  - [net-next,24/29] can: kvaser_usb_hydra: do not report txerr and rxerr during bus-off
    https://git.kernel.org/netdev/net-next/c/936e90595376
  - [net-next,25/29] can: kvaser_usb_leaf: do not report txerr and rxerr during bus-off
    https://git.kernel.org/netdev/net-next/c/a57732084e06
  - [net-next,26/29] can: usb_8dev: do not report txerr and rxerr during bus-off
    https://git.kernel.org/netdev/net-next/c/aebe8a2433cd
  - [net-next,27/29] can: error: specify the values of data[5..7] of CAN error frames
    https://git.kernel.org/netdev/net-next/c/e70a3263a7ee
  - [net-next,28/29] can: add CAN_ERR_CNT flag to notify availability of error counter
    https://git.kernel.org/netdev/net-next/c/3e5c291c7942
  - [net-next,29/29] can: error: add definitions for the different CAN error thresholds
    https://git.kernel.org/netdev/net-next/c/3f9c26210cf8

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

Re: [PATCH net-next 18/29] can: pch_can: do not report txerr and rxerr during bus-off

[Nathan Chancellor]

On Wed, Jul 20, 2022 at 10:10:23AM +0200, Marc Kleine-Budde wrote:
> From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
> 
> During bus off, the error count is greater than 255 and can not fit in
> a u8.
> 
> Fixes: 0c78ab76a05c ("pch_can: Add setting TEC/REC statistics processing")
> Link: https://lore.kernel.org/all/20220719143550.3681-2-mailhol.vincent@wanadoo.fr
> Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
> ---
>  drivers/net/can/pch_can.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
> index fde3ac516d26..497ef77340ea 100644
> --- a/drivers/net/can/pch_can.c
> +++ b/drivers/net/can/pch_can.c
> @@ -496,6 +496,9 @@ static void pch_can_error(struct net_device *ndev, u32 status)
>  		cf->can_id |= CAN_ERR_BUSOFF;
>  		priv->can.can_stats.bus_off++;
>  		can_bus_off(ndev);
> +	} else {
> +		cf->data[6] = errc & PCH_TEC;
> +		cf->data[7] = (errc & PCH_REC) >> 8;
>  	}
>  
>  	errc = ioread32(&priv->regs->errc);
> @@ -556,9 +559,6 @@ static void pch_can_error(struct net_device *ndev, u32 status)
>  		break;
>  	}
>  
> -	cf->data[6] = errc & PCH_TEC;
> -	cf->data[7] = (errc & PCH_REC) >> 8;
> -
>  	priv->can.state = state;
>  	netif_receive_skb(skb);
>  }
> -- 
> 2.35.1
> 
> 
> 

Apologies if this has been reported already, I didn't see anything on
the mailing lists.

This commit is now in -next as commit 3a5c7e4611dd ("can: pch_can: do
not report txerr and rxerr during bus-off"), where it causes the
following clang warning:

  ../drivers/net/can/pch_can.c:501:17: error: variable 'errc' is uninitialized when used here [-Werror,-Wuninitialized]
                  cf->data[6] = errc & PCH_TEC;
                                ^~~~
  ../drivers/net/can/pch_can.c:484:10: note: initialize the variable 'errc' to silence this warning
          u32 errc, lec;
                  ^
                   = 0
  1 error generated.

errc is initialized underneath this now, should it be hoisted or is
there another fix?

Cheers,
Nathan

Re: [PATCH net-next 18/29] can: pch_can: do not report txerr and rxerr during bus-off

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 2642 bytes --]

On 21.07.2022 08:27:06, Nathan Chancellor wrote:
> On Wed, Jul 20, 2022 at 10:10:23AM +0200, Marc Kleine-Budde wrote:
> > From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
> > 
> > During bus off, the error count is greater than 255 and can not fit in
> > a u8.
> > 
> > Fixes: 0c78ab76a05c ("pch_can: Add setting TEC/REC statistics processing")
> > Link: https://lore.kernel.org/all/20220719143550.3681-2-mailhol.vincent@wanadoo.fr
> > Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
> > Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
> > ---
> >  drivers/net/can/pch_can.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
> > index fde3ac516d26..497ef77340ea 100644
> > --- a/drivers/net/can/pch_can.c
> > +++ b/drivers/net/can/pch_can.c
> > @@ -496,6 +496,9 @@ static void pch_can_error(struct net_device *ndev, u32 status)
> >  		cf->can_id |= CAN_ERR_BUSOFF;
> >  		priv->can.can_stats.bus_off++;
> >  		can_bus_off(ndev);
> > +	} else {
> > +		cf->data[6] = errc & PCH_TEC;
> > +		cf->data[7] = (errc & PCH_REC) >> 8;
> >  	}
> >  
> >  	errc = ioread32(&priv->regs->errc);
> > @@ -556,9 +559,6 @@ static void pch_can_error(struct net_device *ndev, u32 status)
> >  		break;
> >  	}
> >  
> > -	cf->data[6] = errc & PCH_TEC;
> > -	cf->data[7] = (errc & PCH_REC) >> 8;
> > -
> >  	priv->can.state = state;
> >  	netif_receive_skb(skb);
> >  }
> > -- 
> > 2.35.1
> > 
> > 
> > 
> 
> Apologies if this has been reported already, I didn't see anything on
> the mailing lists.
> 
> This commit is now in -next as commit 3a5c7e4611dd ("can: pch_can: do
> not report txerr and rxerr during bus-off"), where it causes the
> following clang warning:
> 
>   ../drivers/net/can/pch_can.c:501:17: error: variable 'errc' is uninitialized when used here [-Werror,-Wuninitialized]
>                   cf->data[6] = errc & PCH_TEC;
>                                 ^~~~
>   ../drivers/net/can/pch_can.c:484:10: note: initialize the variable 'errc' to silence this warning
>           u32 errc, lec;
>                   ^
>                    = 0
>   1 error generated.
> 
> errc is initialized underneath this now, should it be hoisted or is
> there another fix?

Doh! I'll send a fix.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

[PATCH] can: pch_can: initialize errc before using it

[Vincent Mailhol]

After commit 3a5c7e4611dd, the variable errc is accessed before being
initialized, c.f. below W=2 warning:

| In function 'pch_can_error',
|     inlined from 'pch_can_poll' at drivers/net/can/pch_can.c:739:4:
| drivers/net/can/pch_can.c:501:29: warning: 'errc' may be used uninitialized [-Wmaybe-uninitialized]
|   501 |                 cf->data[6] = errc & PCH_TEC;
|       |                             ^
| drivers/net/can/pch_can.c: In function 'pch_can_poll':
| drivers/net/can/pch_can.c:484:13: note: 'errc' was declared here
|   484 |         u32 errc, lec;
|       |             ^~~~

Moving errc initialization up solves this issue.

Fixes: 3a5c7e4611dd ("can: pch_can: do not report txerr and rxerr during bus-off")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
---
 drivers/net/can/pch_can.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index 50f6719b3aa4..32804fed116c 100644
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -489,6 +489,7 @@ static void pch_can_error(struct net_device *ndev, u32 status)
 	if (!skb)
 		return;
 
+	errc = ioread32(&priv->regs->errc);
 	if (status & PCH_BUS_OFF) {
 		pch_can_set_tx_all(priv, 0);
 		pch_can_set_rx_all(priv, 0);
@@ -502,7 +503,6 @@ static void pch_can_error(struct net_device *ndev, u32 status)
 		cf->data[7] = (errc & PCH_REC) >> 8;
 	}
 
-	errc = ioread32(&priv->regs->errc);
 	/* Warning interrupt. */
 	if (status & PCH_EWARN) {
 		state = CAN_STATE_ERROR_WARNING;
-- 
2.35.1

Re: [PATCH] can: pch_can: initialize errc before using it

[Nathan Chancellor]

On Fri, Jul 22, 2022 at 01:00:32AM +0900, Vincent Mailhol wrote:
> After commit 3a5c7e4611dd, the variable errc is accessed before being
> initialized, c.f. below W=2 warning:
> 
> | In function 'pch_can_error',
> |     inlined from 'pch_can_poll' at drivers/net/can/pch_can.c:739:4:
> | drivers/net/can/pch_can.c:501:29: warning: 'errc' may be used uninitialized [-Wmaybe-uninitialized]
> |   501 |                 cf->data[6] = errc & PCH_TEC;
> |       |                             ^
> | drivers/net/can/pch_can.c: In function 'pch_can_poll':
> | drivers/net/can/pch_can.c:484:13: note: 'errc' was declared here
> |   484 |         u32 errc, lec;
> |       |             ^~~~
> 
> Moving errc initialization up solves this issue.
> 
> Fixes: 3a5c7e4611dd ("can: pch_can: do not report txerr and rxerr during bus-off")
> Reported-by: Nathan Chancellor <nathan@kernel.org>
> Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>

Heh, Marc just sent the same patch. Just in case this one gets picked up
instead:

Reviewed-by: Nathan Chancellor <nathan@kernel.org>

Thanks for the quick response!

> ---
>  drivers/net/can/pch_can.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
> index 50f6719b3aa4..32804fed116c 100644
> --- a/drivers/net/can/pch_can.c
> +++ b/drivers/net/can/pch_can.c
> @@ -489,6 +489,7 @@ static void pch_can_error(struct net_device *ndev, u32 status)
>  	if (!skb)
>  		return;
>  
> +	errc = ioread32(&priv->regs->errc);
>  	if (status & PCH_BUS_OFF) {
>  		pch_can_set_tx_all(priv, 0);
>  		pch_can_set_rx_all(priv, 0);
> @@ -502,7 +503,6 @@ static void pch_can_error(struct net_device *ndev, u32 status)
>  		cf->data[7] = (errc & PCH_REC) >> 8;
>  	}
>  
> -	errc = ioread32(&priv->regs->errc);
>  	/* Warning interrupt. */
>  	if (status & PCH_EWARN) {
>  		state = CAN_STATE_ERROR_WARNING;
> -- 
> 2.35.1
> 

Re: [PATCH net-next 18/29] can: pch_can: do not report txerr and rxerr during bus-off

[Vincent MAILHOL]

On Fri. 22 Jul. 2022 at 00:49, Marc Kleine-Budde <mkl@pengutronix.de> wrote:
> On 21.07.2022 08:27:06, Nathan Chancellor wrote:
> > On Wed, Jul 20, 2022 at 10:10:23AM +0200, Marc Kleine-Budde wrote:
> > > From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
> > >
> > > During bus off, the error count is greater than 255 and can not fit in
> > > a u8.
> > >
> > > Fixes: 0c78ab76a05c ("pch_can: Add setting TEC/REC statistics processing")
> > > Link: https://lore.kernel.org/all/20220719143550.3681-2-mailhol.vincent@wanadoo.fr
> > > Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
> > > Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
> > > ---
> > >  drivers/net/can/pch_can.c | 6 +++---
> > >  1 file changed, 3 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
> > > index fde3ac516d26..497ef77340ea 100644
> > > --- a/drivers/net/can/pch_can.c
> > > +++ b/drivers/net/can/pch_can.c
> > > @@ -496,6 +496,9 @@ static void pch_can_error(struct net_device *ndev, u32 status)
> > >             cf->can_id |= CAN_ERR_BUSOFF;
> > >             priv->can.can_stats.bus_off++;
> > >             can_bus_off(ndev);
> > > +   } else {
> > > +           cf->data[6] = errc & PCH_TEC;
> > > +           cf->data[7] = (errc & PCH_REC) >> 8;
> > >     }
> > >
> > >     errc = ioread32(&priv->regs->errc);
> > > @@ -556,9 +559,6 @@ static void pch_can_error(struct net_device *ndev, u32 status)
> > >             break;
> > >     }
> > >
> > > -   cf->data[6] = errc & PCH_TEC;
> > > -   cf->data[7] = (errc & PCH_REC) >> 8;
> > > -
> > >     priv->can.state = state;
> > >     netif_receive_skb(skb);
> > >  }
> > > --
> > > 2.35.1
> > >
> > >
> > >
> >
> > Apologies if this has been reported already, I didn't see anything on
> > the mailing lists.
> >
> > This commit is now in -next as commit 3a5c7e4611dd ("can: pch_can: do
> > not report txerr and rxerr during bus-off"), where it causes the
> > following clang warning:
> >
> >   ../drivers/net/can/pch_can.c:501:17: error: variable 'errc' is uninitialized when used here [-Werror,-Wuninitialized]
> >                   cf->data[6] = errc & PCH_TEC;
> >                                 ^~~~
> >   ../drivers/net/can/pch_can.c:484:10: note: initialize the variable 'errc' to silence this warning
> >           u32 errc, lec;
> >                   ^
> >                    = 0
> >   1 error generated.
> >
> > errc is initialized underneath this now, should it be hoisted or is
> > there another fix?

Thanks for reporting and sorry for the bug.

That said, I have one complaint: this type of warning is reported at
W=2 *but* W=2 output is heavily polluted, mostly due to a false
positive on linux/bits.h's GENMASK_INPUT_CHECK(). Under the current
situation, the relevant warings become invisible with all the
flooding.
I tried to send a patch to silence a huge chunk of the W=2 spam in [1]
but it got rejected. I am sorry but even with the best intent, I might
repeat a similar mistake in the future. The W=2 is just not usable.

[1] https://lore.kernel.org/all/20220426161658.437466-1-mailhol.vincent@wanadoo.fr/

> Doh! I'll send a fix.

Thanks Marc for the patch!

Re: [PATCH net-next 18/29] can: pch_can: do not report txerr and rxerr during bus-off

[Nathan Chancellor]

On Fri, Jul 22, 2022 at 01:11:49AM +0900, Vincent MAILHOL wrote:
> On Fri. 22 Jul. 2022 at 00:49, Marc Kleine-Budde <mkl@pengutronix.de> wrote:
> > On 21.07.2022 08:27:06, Nathan Chancellor wrote:
> > > On Wed, Jul 20, 2022 at 10:10:23AM +0200, Marc Kleine-Budde wrote:
> > > > From: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
> > > >
> > > > During bus off, the error count is greater than 255 and can not fit in
> > > > a u8.
> > > >
> > > > Fixes: 0c78ab76a05c ("pch_can: Add setting TEC/REC statistics processing")
> > > > Link: https://lore.kernel.org/all/20220719143550.3681-2-mailhol.vincent@wanadoo.fr
> > > > Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
> > > > Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
> > > > ---
> > > >  drivers/net/can/pch_can.c | 6 +++---
> > > >  1 file changed, 3 insertions(+), 3 deletions(-)
> > > >
> > > > diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
> > > > index fde3ac516d26..497ef77340ea 100644
> > > > --- a/drivers/net/can/pch_can.c
> > > > +++ b/drivers/net/can/pch_can.c
> > > > @@ -496,6 +496,9 @@ static void pch_can_error(struct net_device *ndev, u32 status)
> > > >             cf->can_id |= CAN_ERR_BUSOFF;
> > > >             priv->can.can_stats.bus_off++;
> > > >             can_bus_off(ndev);
> > > > +   } else {
> > > > +           cf->data[6] = errc & PCH_TEC;
> > > > +           cf->data[7] = (errc & PCH_REC) >> 8;
> > > >     }
> > > >
> > > >     errc = ioread32(&priv->regs->errc);
> > > > @@ -556,9 +559,6 @@ static void pch_can_error(struct net_device *ndev, u32 status)
> > > >             break;
> > > >     }
> > > >
> > > > -   cf->data[6] = errc & PCH_TEC;
> > > > -   cf->data[7] = (errc & PCH_REC) >> 8;
> > > > -
> > > >     priv->can.state = state;
> > > >     netif_receive_skb(skb);
> > > >  }
> > > > --
> > > > 2.35.1
> > > >
> > > >
> > > >
> > >
> > > Apologies if this has been reported already, I didn't see anything on
> > > the mailing lists.
> > >
> > > This commit is now in -next as commit 3a5c7e4611dd ("can: pch_can: do
> > > not report txerr and rxerr during bus-off"), where it causes the
> > > following clang warning:
> > >
> > >   ../drivers/net/can/pch_can.c:501:17: error: variable 'errc' is uninitialized when used here [-Werror,-Wuninitialized]
> > >                   cf->data[6] = errc & PCH_TEC;
> > >                                 ^~~~
> > >   ../drivers/net/can/pch_can.c:484:10: note: initialize the variable 'errc' to silence this warning
> > >           u32 errc, lec;
> > >                   ^
> > >                    = 0
> > >   1 error generated.
> > >
> > > errc is initialized underneath this now, should it be hoisted or is
> > > there another fix?
> 
> Thanks for reporting and sorry for the bug.

No worries, it happens :)

> That said, I have one complaint: this type of warning is reported at
> W=2 *but* W=2 output is heavily polluted, mostly due to a false
> positive on linux/bits.h's GENMASK_INPUT_CHECK(). Under the current
> situation, the relevant warings become invisible with all the
> flooding.
> I tried to send a patch to silence a huge chunk of the W=2 spam in [1]
> but it got rejected. I am sorry but even with the best intent, I might
> repeat a similar mistake in the future. The W=2 is just not usable.
> 
> [1] https://lore.kernel.org/all/20220426161658.437466-1-mailhol.vincent@wanadoo.fr/

Yes, having -Wmaybe-uninitialized in W=2 is unfortunate because these
types of mistakes will continue to happen. I have been fighting this for
a while and so has Dan Carpenter, who started a thread about it a couple
of months ago but it doesn't seem like it really went anywhere:

https://lore.kernel.org/20220506091338.GE4031@kadam/

Cheers,
Nathan

Re: [PATCH net-next 18/29] can: pch_can: do not report txerr and rxerr during bus-off

[Jakub Kicinski]

On Thu, 21 Jul 2022 09:20:23 -0700 Nathan Chancellor wrote:
> > That said, I have one complaint: this type of warning is reported at
> > W=2 *but* W=2 output is heavily polluted, mostly due to a false
> > positive on linux/bits.h's GENMASK_INPUT_CHECK(). Under the current
> > situation, the relevant warings become invisible with all the
> > flooding.
> > I tried to send a patch to silence a huge chunk of the W=2 spam in [1]
> > but it got rejected. I am sorry but even with the best intent, I might
> > repeat a similar mistake in the future. The W=2 is just not usable.
> > 
> > [1] https://lore.kernel.org/all/20220426161658.437466-1-mailhol.vincent@wanadoo.fr/  
> 
> Yes, having -Wmaybe-uninitialized in W=2 is unfortunate because these
> types of mistakes will continue to happen. I have been fighting this for
> a while and so has Dan Carpenter, who started a thread about it a couple
> of months ago but it doesn't seem like it really went anywhere:
> 
> https://lore.kernel.org/20220506091338.GE4031@kadam/

FWIW it's reported by clang and was in fact reported in the netdev
patchwork:
https://patchwork.kernel.org/project/netdevbpf/patch/20220720081034.3277385-19-mkl@pengutronix.de/
DaveM must have not looked before pulling :S