[PATCH net-next 00/15] in_interrupt() cleanup, part 2

[PATCH net-next 00/15] in_interrupt() cleanup, part 2

[Sebastian Andrzej Siewior]

Folks,

in the discussion about preempt count consistency across kernel configurations:

  https://lore.kernel.org/r/20200914204209.256266093@linutronix.de/

Linus clearly requested that code in drivers and libraries which changes
behaviour based on execution context should either be split up so that
e.g. task context invocations and BH invocations have different interfaces
or if that's not possible the context information has to be provided by the
caller which knows in which context it is executing.

This includes conditional locking, allocation mode (GFP_*) decisions and
avoidance of code paths which might sleep.

In the long run, usage of 'preemptible, in_*irq etc.' should be banned from
driver code completely.

This is part two addressing remaining drivers except for orinoco-usb.

Sebastian

[PATCH net-next 01/15] net: orinoco: Remove BUG_ON(in_interrupt/irq())

[Sebastian Andrzej Siewior]

The usage of in_irq()/in_interrupt() in drivers is phased out and the
BUG_ON()'s based on those are not covering all contexts in which these
functions cannot be called.

Aside of that BUG_ON() should only be used as last resort, which is clearly
not the case here.

A broad variety of checks in the invoked functions (always enabled or debug
option dependent) cover these conditions already, so the BUG_ON()'s do not
really provide additional value.

Just remove them.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
---
 drivers/net/wireless/intersil/orinoco/orinoco_usb.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/net/wireless/intersil/orinoco/orinoco_usb.c b/drivers/net/wireless/intersil/orinoco/orinoco_usb.c
index b849d27bd741e..046f2453ad5d9 100644
--- a/drivers/net/wireless/intersil/orinoco/orinoco_usb.c
+++ b/drivers/net/wireless/intersil/orinoco/orinoco_usb.c
@@ -859,8 +859,6 @@ static int ezusb_access_ltv(struct ezusb_priv *upriv,
 	int retval = 0;
 	enum ezusb_state state;
 
-	BUG_ON(in_irq());
-
 	if (!upriv->udev) {
 		retval = -ENODEV;
 		goto exit;
@@ -1349,7 +1347,6 @@ static int ezusb_init(struct hermes *hw)
 	struct ezusb_priv *upriv = hw->priv;
 	int retval;
 
-	BUG_ON(in_interrupt());
 	if (!upriv)
 		return -EINVAL;
 
@@ -1448,7 +1445,6 @@ static inline void ezusb_delete(struct ezusb_priv *upriv)
 	struct list_head *tmp_item;
 	unsigned long flags;
 
-	BUG_ON(in_interrupt());
 	BUG_ON(!upriv);
 
 	mutex_lock(&upriv->mtx);
-- 
2.28.0

[PATCH net-next 02/15] net: neterion: s2io: Replace in_interrupt() for context detection

[Sebastian Andrzej Siewior]

wait_for_cmd_complete() uses in_interrupt() to detect whether it is safe to
sleep or not.

The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be seperated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

in_interrupt() also is only partially correct because it fails to chose the
correct code path when just preemption or interrupts are disabled.

Add an argument 'may_block' to both functions and adjust the callers to
pass the context information.

The following call chains which end up invoking wait_for_cmd_complete()
were analyzed to be safe to sleep:

 s2io_card_up()
   s2io_set_multicast()

 init_nic()
   init_tti()

 s2io_close()
   do_s2io_delete_unicast_mc()
     do_s2io_add_mac()

 s2io_set_mac_addr()
   do_s2io_prog_unicast()
     do_s2io_add_mac()

 s2io_reset()
   do_s2io_restore_unicast_mc()
     do_s2io_add_mc()
       do_s2io_add_mac()

 s2io_open()
   do_s2io_prog_unicast()
     do_s2io_add_mac()

The following call chains which end up invoking wait_for_cmd_complete()
were analyzed to be safe to sleep:

 __dev_set_rx_mode()
    s2io_set_multicast()

 s2io_txpic_intr_handle()
   s2io_link()
     init_tti()

Add a may_sleep argument to wait_for_cmd_complete(), s2io_set_multicast()
and init_tti() and hand the context information in from the call sites.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Jon Mason <jdmason@kudzu.us>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org
---
 drivers/net/ethernet/neterion/s2io.c | 41 ++++++++++++++++------------
 drivers/net/ethernet/neterion/s2io.h |  4 +--
 2 files changed, 25 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/neterion/s2io.c b/drivers/net/ethernet/neterion/s2io.c
index d13d92bf74478..8f2f091bce899 100644
--- a/drivers/net/ethernet/neterion/s2io.c
+++ b/drivers/net/ethernet/neterion/s2io.c
@@ -1106,7 +1106,7 @@ static int s2io_print_pci_mode(struct s2io_nic *nic)
  *  '-1' on failure
  */
 
-static int init_tti(struct s2io_nic *nic, int link)
+static int init_tti(struct s2io_nic *nic, int link, bool may_sleep)
 {
 	struct XENA_dev_config __iomem *bar0 = nic->bar0;
 	register u64 val64 = 0;
@@ -1166,7 +1166,7 @@ static int init_tti(struct s2io_nic *nic, int link)
 
 		if (wait_for_cmd_complete(&bar0->tti_command_mem,
 					  TTI_CMD_MEM_STROBE_NEW_CMD,
-					  S2IO_BIT_RESET) != SUCCESS)
+					  S2IO_BIT_RESET, may_sleep) != SUCCESS)
 			return FAILURE;
 	}
 
@@ -1659,7 +1659,7 @@ static int init_nic(struct s2io_nic *nic)
 	 */
 
 	/* Initialize TTI */
-	if (SUCCESS != init_tti(nic, nic->last_link_state))
+	if (SUCCESS != init_tti(nic, nic->last_link_state, true))
 		return -ENODEV;
 
 	/* RTI Initialization */
@@ -3331,7 +3331,7 @@ static void s2io_updt_xpak_counter(struct net_device *dev)
  */
 
 static int wait_for_cmd_complete(void __iomem *addr, u64 busy_bit,
-				 int bit_state)
+				 int bit_state, bool may_sleep)
 {
 	int ret = FAILURE, cnt = 0, delay = 1;
 	u64 val64;
@@ -3353,7 +3353,7 @@ static int wait_for_cmd_complete(void __iomem *addr, u64 busy_bit,
 			}
 		}
 
-		if (in_interrupt())
+		if (!may_sleep)
 			mdelay(delay);
 		else
 			msleep(delay);
@@ -4877,8 +4877,7 @@ static struct net_device_stats *s2io_get_stats(struct net_device *dev)
  *  Return value:
  *  void.
  */
-
-static void s2io_set_multicast(struct net_device *dev)
+static void s2io_set_multicast(struct net_device *dev, bool may_sleep)
 {
 	int i, j, prev_cnt;
 	struct netdev_hw_addr *ha;
@@ -4903,7 +4902,7 @@ static void s2io_set_multicast(struct net_device *dev)
 		/* Wait till command completes */
 		wait_for_cmd_complete(&bar0->rmac_addr_cmd_mem,
 				      RMAC_ADDR_CMD_MEM_STROBE_CMD_EXECUTING,
-				      S2IO_BIT_RESET);
+				      S2IO_BIT_RESET, may_sleep);
 
 		sp->m_cast_flg = 1;
 		sp->all_multi_pos = config->max_mc_addr - 1;
@@ -4920,7 +4919,7 @@ static void s2io_set_multicast(struct net_device *dev)
 		/* Wait till command completes */
 		wait_for_cmd_complete(&bar0->rmac_addr_cmd_mem,
 				      RMAC_ADDR_CMD_MEM_STROBE_CMD_EXECUTING,
-				      S2IO_BIT_RESET);
+				      S2IO_BIT_RESET, may_sleep);
 
 		sp->m_cast_flg = 0;
 		sp->all_multi_pos = 0;
@@ -5000,7 +4999,7 @@ static void s2io_set_multicast(struct net_device *dev)
 			/* Wait for command completes */
 			if (wait_for_cmd_complete(&bar0->rmac_addr_cmd_mem,
 						  RMAC_ADDR_CMD_MEM_STROBE_CMD_EXECUTING,
-						  S2IO_BIT_RESET)) {
+						  S2IO_BIT_RESET, may_sleep)) {
 				DBG_PRINT(ERR_DBG,
 					  "%s: Adding Multicasts failed\n",
 					  dev->name);
@@ -5030,7 +5029,7 @@ static void s2io_set_multicast(struct net_device *dev)
 			/* Wait for command completes */
 			if (wait_for_cmd_complete(&bar0->rmac_addr_cmd_mem,
 						  RMAC_ADDR_CMD_MEM_STROBE_CMD_EXECUTING,
-						  S2IO_BIT_RESET)) {
+						  S2IO_BIT_RESET, may_sleep)) {
 				DBG_PRINT(ERR_DBG,
 					  "%s: Adding Multicasts failed\n",
 					  dev->name);
@@ -5041,6 +5040,12 @@ static void s2io_set_multicast(struct net_device *dev)
 	}
 }
 
+/* NDO wrapper for s2io_set_multicast */
+static void s2io_ndo_set_multicast(struct net_device *dev)
+{
+	s2io_set_multicast(dev, false);
+}
+
 /* read from CAM unicast & multicast addresses and store it in
  * def_mac_addr structure
  */
@@ -5127,7 +5132,7 @@ static int do_s2io_add_mac(struct s2io_nic *sp, u64 addr, int off)
 	/* Wait till command completes */
 	if (wait_for_cmd_complete(&bar0->rmac_addr_cmd_mem,
 				  RMAC_ADDR_CMD_MEM_STROBE_CMD_EXECUTING,
-				  S2IO_BIT_RESET)) {
+				  S2IO_BIT_RESET, true)) {
 		DBG_PRINT(INFO_DBG, "do_s2io_add_mac failed\n");
 		return FAILURE;
 	}
@@ -5171,7 +5176,7 @@ static u64 do_s2io_read_unicast_mc(struct s2io_nic *sp, int offset)
 	/* Wait till command completes */
 	if (wait_for_cmd_complete(&bar0->rmac_addr_cmd_mem,
 				  RMAC_ADDR_CMD_MEM_STROBE_CMD_EXECUTING,
-				  S2IO_BIT_RESET)) {
+				  S2IO_BIT_RESET, true)) {
 		DBG_PRINT(INFO_DBG, "do_s2io_read_unicast_mc failed\n");
 		return FAILURE;
 	}
@@ -7141,7 +7146,7 @@ static int s2io_card_up(struct s2io_nic *sp)
 	}
 
 	/* Setting its receive mode */
-	s2io_set_multicast(dev);
+	s2io_set_multicast(dev, true);
 
 	if (dev->features & NETIF_F_LRO) {
 		/* Initialize max aggregatable pkts per session based on MTU */
@@ -7447,7 +7452,7 @@ static void s2io_link(struct s2io_nic *sp, int link)
 	struct swStat *swstats = &sp->mac_control.stats_info->sw_stat;
 
 	if (link != sp->last_link_state) {
-		init_tti(sp, link);
+		init_tti(sp, link, false);
 		if (link == LINK_DOWN) {
 			DBG_PRINT(ERR_DBG, "%s: Link down\n", dev->name);
 			s2io_stop_all_tx_queue(sp);
@@ -7604,7 +7609,7 @@ static int rts_ds_steer(struct s2io_nic *nic, u8 ds_codepoint, u8 ring)
 
 	return wait_for_cmd_complete(&bar0->rts_ds_mem_ctrl,
 				     RTS_DS_MEM_CTRL_STROBE_CMD_BEING_EXECUTED,
-				     S2IO_BIT_RESET);
+				     S2IO_BIT_RESET, true);
 }
 
 static const struct net_device_ops s2io_netdev_ops = {
@@ -7613,7 +7618,7 @@ static const struct net_device_ops s2io_netdev_ops = {
 	.ndo_get_stats	        = s2io_get_stats,
 	.ndo_start_xmit    	= s2io_xmit,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_set_rx_mode	= s2io_set_multicast,
+	.ndo_set_rx_mode	= s2io_ndo_set_multicast,
 	.ndo_do_ioctl	   	= s2io_ioctl,
 	.ndo_set_mac_address    = s2io_set_mac_addr,
 	.ndo_change_mtu	   	= s2io_change_mtu,
@@ -7929,7 +7934,7 @@ s2io_init_nic(struct pci_dev *pdev, const struct pci_device_id *pre)
 	writeq(val64, &bar0->rmac_addr_cmd_mem);
 	wait_for_cmd_complete(&bar0->rmac_addr_cmd_mem,
 			      RMAC_ADDR_CMD_MEM_STROBE_CMD_EXECUTING,
-			      S2IO_BIT_RESET);
+			      S2IO_BIT_RESET, true);
 	tmp64 = readq(&bar0->rmac_addr_data0_mem);
 	mac_down = (u32)tmp64;
 	mac_up = (u32) (tmp64 >> 32);
diff --git a/drivers/net/ethernet/neterion/s2io.h b/drivers/net/ethernet/neterion/s2io.h
index 6fa3159a977fd..5a6032212c19d 100644
--- a/drivers/net/ethernet/neterion/s2io.h
+++ b/drivers/net/ethernet/neterion/s2io.h
@@ -1066,7 +1066,7 @@ static void tx_intr_handler(struct fifo_info *fifo_data);
 static void s2io_handle_errors(void * dev_id);
 
 static void s2io_tx_watchdog(struct net_device *dev, unsigned int txqueue);
-static void s2io_set_multicast(struct net_device *dev);
+static void s2io_set_multicast(struct net_device *dev, bool may_sleep);
 static int rx_osm_handler(struct ring_info *ring_data, struct RxD_t * rxdp);
 static void s2io_link(struct s2io_nic * sp, int link);
 static void s2io_reset(struct s2io_nic * sp);
@@ -1087,7 +1087,7 @@ static int s2io_set_swapper(struct s2io_nic * sp);
 static void s2io_card_down(struct s2io_nic *nic);
 static int s2io_card_up(struct s2io_nic *nic);
 static int wait_for_cmd_complete(void __iomem *addr, u64 busy_bit,
-					int bit_state);
+				 int bit_state, bool may_sleep);
 static int s2io_add_isr(struct s2io_nic * sp);
 static void s2io_rem_isr(struct s2io_nic * sp);
 
-- 
2.28.0

[PATCH net-next 03/15] net: forcedeth: Replace context and lock check with a lockdep_assert()

[Sebastian Andrzej Siewior]

nv_update_stats() triggers a WARN_ON() when invoked from hard interrupt
context because the locks in use are not hard interrupt safe. It also has
an assert_spin_locked() which was the lock check before the lockdep era.

Lockdep has way broader locking correctness checks and covers both issues,
so replace the warning and the lock assert with lockdep_assert_held().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Rain River <rain.1986.08.12@gmail.com>
Cc: Zhu Yanjun <zyjzyj2000@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org
---
 drivers/net/ethernet/nvidia/forcedeth.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/nvidia/forcedeth.c b/drivers/net/ethernet/nvidia/forcedeth.c
index 2fc10a36afa4a..7e85cf943be11 100644
--- a/drivers/net/ethernet/nvidia/forcedeth.c
+++ b/drivers/net/ethernet/nvidia/forcedeth.c
@@ -1666,11 +1666,7 @@ static void nv_update_stats(struct net_device *dev)
 	struct fe_priv *np = netdev_priv(dev);
 	u8 __iomem *base = get_hwbase(dev);
 
-	/* If it happens that this is run in top-half context, then
-	 * replace the spin_lock of hwstats_lock with
-	 * spin_lock_irqsave() in calling functions. */
-	WARN_ONCE(in_irq(), "forcedeth: estats spin_lock(_bh) from top-half");
-	assert_spin_locked(&np->hwstats_lock);
+	lockdep_assert_held(&np->hwstats_lock);
 
 	/* query hardware */
 	np->estats.tx_bytes += readl(base + NvRegTxCnt);
-- 
2.28.0

[PATCH net-next 04/15] net: mlx5: Replace in_irq() usage.

[Sebastian Andrzej Siewior]

mlx5_eq_async_int() uses in_irq() to decide whether eq::lock needs to be
acquired and released with spin_[un]lock() or the irq saving/restoring
variants.

The usage of in_*() in drivers is phased out and Linus clearly requested
that code which changes behaviour depending on context should either be
seperated or the context be conveyed in an argument passed by the caller,
which usually knows the context.

mlx5_eq_async_int() knows the context via the action argument already so
using it for the lock variant decision is a straight forward replacement
for in_irq().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Saeed Mahameed <saeedm@nvidia.com>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-rdma@vger.kernel.org
---
 drivers/net/ethernet/mellanox/mlx5/core/eq.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index 8ebfe782f95e5..3800e9415158b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -189,19 +189,21 @@ u32 mlx5_eq_poll_irq_disabled(struct mlx5_eq_comp *eq)
 	return count_eqe;
 }
 
-static void mlx5_eq_async_int_lock(struct mlx5_eq_async *eq, unsigned long *flags)
+static void mlx5_eq_async_int_lock(struct mlx5_eq_async *eq, bool recovery,
+				   unsigned long *flags)
 	__acquires(&eq->lock)
 {
-	if (in_irq())
+	if (!recovery)
 		spin_lock(&eq->lock);
 	else
 		spin_lock_irqsave(&eq->lock, *flags);
 }
 
-static void mlx5_eq_async_int_unlock(struct mlx5_eq_async *eq, unsigned long *flags)
+static void mlx5_eq_async_int_unlock(struct mlx5_eq_async *eq, bool recovery,
+				     unsigned long *flags)
 	__releases(&eq->lock)
 {
-	if (in_irq())
+	if (!recovery)
 		spin_unlock(&eq->lock);
 	else
 		spin_unlock_irqrestore(&eq->lock, *flags);
@@ -222,12 +224,14 @@ static int mlx5_eq_async_int(struct notifier_block *nb,
 	struct mlx5_core_dev *dev;
 	struct mlx5_eqe *eqe;
 	unsigned long flags;
+	bool recovery;
 	int num_eqes = 0;
 
 	dev = eq->dev;
 	eqt = dev->priv.eq_table;
 
-	mlx5_eq_async_int_lock(eq_async, &flags);
+	recovery = action == ASYNC_EQ_RECOVER;
+	mlx5_eq_async_int_lock(eq_async, recovery, &flags);
 
 	eqe = next_eqe_sw(eq);
 	if (!eqe)
@@ -249,9 +253,9 @@ static int mlx5_eq_async_int(struct notifier_block *nb,
 
 out:
 	eq_update_ci(eq, 1);
-	mlx5_eq_async_int_unlock(eq_async, &flags);
+	mlx5_eq_async_int_unlock(eq_async, recovery, &flags);
 
-	return unlikely(action == ASYNC_EQ_RECOVER) ? num_eqes : 0;
+	return unlikely(recovery) ? num_eqes : 0;
 }
 
 void mlx5_cmd_eq_recover(struct mlx5_core_dev *dev)
-- 
2.28.0

Re: [PATCH net-next 04/15] net: mlx5: Replace in_irq() usage.

[Jakub Kicinski]

On Tue, 27 Oct 2020 23:54:43 +0100 Sebastian Andrzej Siewior wrote:
> mlx5_eq_async_int() uses in_irq() to decide whether eq::lock needs to be
> acquired and released with spin_[un]lock() or the irq saving/restoring
> variants.
> 
> The usage of in_*() in drivers is phased out and Linus clearly requested
> that code which changes behaviour depending on context should either be
> seperated or the context be conveyed in an argument passed by the caller,
> which usually knows the context.
> 
> mlx5_eq_async_int() knows the context via the action argument already so
> using it for the lock variant decision is a straight forward replacement
> for in_irq().
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Cc: Saeed Mahameed <saeedm@nvidia.com>
> Cc: Leon Romanovsky <leon@kernel.org>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: linux-rdma@vger.kernel.org

Saeed, please pick this up into your tree.

Re: [PATCH net-next 04/15] net: mlx5: Replace in_irq() usage.

[Saeed Mahameed]

On Sat, 2020-10-31 at 09:59 -0700, Jakub Kicinski wrote:
> On Tue, 27 Oct 2020 23:54:43 +0100 Sebastian Andrzej Siewior wrote:
> > mlx5_eq_async_int() uses in_irq() to decide whether eq::lock needs
> > to be
> > acquired and released with spin_[un]lock() or the irq
> > saving/restoring
> > variants.
> > 
> > The usage of in_*() in drivers is phased out and Linus clearly
> > requested
> > that code which changes behaviour depending on context should
> > either be
> > seperated or the context be conveyed in an argument passed by the
> > caller,
> > which usually knows the context.
> > 
> > mlx5_eq_async_int() knows the context via the action argument
> > already so
> > using it for the lock variant decision is a straight forward
> > replacement
> > for in_irq().
> > 
> > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> > Cc: Saeed Mahameed <saeedm@nvidia.com>
> > Cc: Leon Romanovsky <leon@kernel.org>
> > Cc: "David S. Miller" <davem@davemloft.net>
> > Cc: Jakub Kicinski <kuba@kernel.org>
> > Cc: linux-rdma@vger.kernel.org
> 
> Saeed, please pick this up into your tree.

Ack

Re: [PATCH net-next 04/15] net: mlx5: Replace in_irq() usage.

[Saeed Mahameed]

On Sat, 2020-10-31 at 09:59 -0700, Jakub Kicinski wrote:
> On Tue, 27 Oct 2020 23:54:43 +0100 Sebastian Andrzej Siewior wrote:
> > mlx5_eq_async_int() uses in_irq() to decide whether eq::lock needs
> > to be
> > acquired and released with spin_[un]lock() or the irq
> > saving/restoring
> > variants.
> > 
> > The usage of in_*() in drivers is phased out and Linus clearly
> > requested
> > that code which changes behaviour depending on context should
> > either be
> > seperated or the context be conveyed in an argument passed by the
> > caller,
> > which usually knows the context.
> > 
> > mlx5_eq_async_int() knows the context via the action argument
> > already so
> > using it for the lock variant decision is a straight forward
> > replacement
> > for in_irq().
> > 
> > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> > Cc: Saeed Mahameed <saeedm@nvidia.com>
> > Cc: Leon Romanovsky <leon@kernel.org>
> > Cc: "David S. Miller" <davem@davemloft.net>
> > Cc: Jakub Kicinski <kuba@kernel.org>
> > Cc: linux-rdma@vger.kernel.org
> 
> Saeed, please pick this up into your tree.

Applied to net-next-mlx5 will submit to net-next shortly.

[PATCH net-next 05/15] net: tlan: Replace in_irq() usage

[Sebastian Andrzej Siewior]

The driver uses in_irq() to determine if the tlan_priv::lock has to be
acquired in tlan_mii_read_reg() and tlan_mii_write_reg().

The interrupt handler acquires the lock outside of these functions so the
in_irq() check is meant to prevent a lock recursion deadlock. But this
check is incorrect when interrupt force threading is enabled because then
the handler runs in thread context and in_irq() correctly returns false.

The usage of in_*() in drivers is phased out and Linus clearly requested
that code which changes behaviour depending on context should either be
seperated or the context be conveyed in an argument passed by the caller,
which usually knows the context.

tlan_set_timer() has this conditional as well, but this function is only
invoked from task context or the timer callback itself. So it always has to
lock and the check can be removed.

tlan_mii_read_reg(), tlan_mii_write_reg() and tlan_phy_print() are invoked
from interrupt and other contexts.

Split out the actual function body into helper variants which are called
from interrupt context and make the original functions wrappers which
acquire tlan_priv::lock unconditionally.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Samuel Chessman <chessman@tux.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org
---
 drivers/net/ethernet/ti/tlan.c | 98 ++++++++++++++++++++--------------
 1 file changed, 57 insertions(+), 41 deletions(-)

diff --git a/drivers/net/ethernet/ti/tlan.c b/drivers/net/ethernet/ti/tlan.c
index 267c080ee084b..0b2ce4bdc2c3d 100644
--- a/drivers/net/ethernet/ti/tlan.c
+++ b/drivers/net/ethernet/ti/tlan.c
@@ -186,6 +186,7 @@ static void	tlan_reset_adapter(struct net_device *);
 static void	tlan_finish_reset(struct net_device *);
 static void	tlan_set_mac(struct net_device *, int areg, char *mac);
 
+static void	__tlan_phy_print(struct net_device *);
 static void	tlan_phy_print(struct net_device *);
 static void	tlan_phy_detect(struct net_device *);
 static void	tlan_phy_power_down(struct net_device *);
@@ -201,9 +202,11 @@ static void	tlan_phy_finish_auto_neg(struct net_device *);
   static int	tlan_phy_dp83840a_check(struct net_device *);
 */
 
-static bool	tlan_mii_read_reg(struct net_device *, u16, u16, u16 *);
+static bool	__tlan_mii_read_reg(struct net_device *, u16, u16, u16 *);
+static void	tlan_mii_read_reg(struct net_device *, u16, u16, u16 *);
 static void	tlan_mii_send_data(u16, u32, unsigned);
 static void	tlan_mii_sync(u16);
+static void	__tlan_mii_write_reg(struct net_device *, u16, u16, u16);
 static void	tlan_mii_write_reg(struct net_device *, u16, u16, u16);
 
 static void	tlan_ee_send_start(u16);
@@ -242,23 +245,20 @@ static u32
 	tlan_handle_rx_eoc
 };
 
-static inline void
+static void
 tlan_set_timer(struct net_device *dev, u32 ticks, u32 type)
 {
 	struct tlan_priv *priv = netdev_priv(dev);
 	unsigned long flags = 0;
 
-	if (!in_irq())
-		spin_lock_irqsave(&priv->lock, flags);
+	spin_lock_irqsave(&priv->lock, flags);
 	if (priv->timer.function != NULL &&
 	    priv->timer_type != TLAN_TIMER_ACTIVITY) {
-		if (!in_irq())
-			spin_unlock_irqrestore(&priv->lock, flags);
+		spin_unlock_irqrestore(&priv->lock, flags);
 		return;
 	}
 	priv->timer.function = tlan_timer;
-	if (!in_irq())
-		spin_unlock_irqrestore(&priv->lock, flags);
+	spin_unlock_irqrestore(&priv->lock, flags);
 
 	priv->timer_set_at = jiffies;
 	priv->timer_type = type;
@@ -1703,22 +1703,22 @@ static u32 tlan_handle_status_check(struct net_device *dev, u16 host_int)
 				 dev->name, (unsigned) net_sts);
 		}
 		if ((net_sts & TLAN_NET_STS_MIRQ) &&  (priv->phy_num == 0)) {
-			tlan_mii_read_reg(dev, phy, TLAN_TLPHY_STS, &tlphy_sts);
-			tlan_mii_read_reg(dev, phy, TLAN_TLPHY_CTL, &tlphy_ctl);
+			__tlan_mii_read_reg(dev, phy, TLAN_TLPHY_STS, &tlphy_sts);
+			__tlan_mii_read_reg(dev, phy, TLAN_TLPHY_CTL, &tlphy_ctl);
 			if (!(tlphy_sts & TLAN_TS_POLOK) &&
 			    !(tlphy_ctl & TLAN_TC_SWAPOL)) {
 				tlphy_ctl |= TLAN_TC_SWAPOL;
-				tlan_mii_write_reg(dev, phy, TLAN_TLPHY_CTL,
-						   tlphy_ctl);
+				__tlan_mii_write_reg(dev, phy, TLAN_TLPHY_CTL,
+						     tlphy_ctl);
 			} else if ((tlphy_sts & TLAN_TS_POLOK) &&
 				   (tlphy_ctl & TLAN_TC_SWAPOL)) {
 				tlphy_ctl &= ~TLAN_TC_SWAPOL;
-				tlan_mii_write_reg(dev, phy, TLAN_TLPHY_CTL,
-						   tlphy_ctl);
+				__tlan_mii_write_reg(dev, phy, TLAN_TLPHY_CTL,
+						     tlphy_ctl);
 			}
 
 			if (debug)
-				tlan_phy_print(dev);
+				__tlan_phy_print(dev);
 		}
 	}
 
@@ -2379,7 +2379,7 @@ ThunderLAN driver PHY layer routines
 
 
 /*********************************************************************
- *	tlan_phy_print
+ *	__tlan_phy_print
  *
  *	Returns:
  *		Nothing
@@ -2391,11 +2391,13 @@ ThunderLAN driver PHY layer routines
  *
  ********************************************************************/
 
-static void tlan_phy_print(struct net_device *dev)
+static void __tlan_phy_print(struct net_device *dev)
 {
 	struct tlan_priv *priv = netdev_priv(dev);
 	u16 i, data0, data1, data2, data3, phy;
 
+	lockdep_assert_held(&priv->lock);
+
 	phy = priv->phy[priv->phy_num];
 
 	if (priv->adapter->flags & TLAN_ADAPTER_UNMANAGED_PHY) {
@@ -2404,10 +2406,10 @@ static void tlan_phy_print(struct net_device *dev)
 		netdev_info(dev, "PHY 0x%02x\n", phy);
 		pr_info("   Off.  +0     +1     +2     +3\n");
 		for (i = 0; i < 0x20; i += 4) {
-			tlan_mii_read_reg(dev, phy, i, &data0);
-			tlan_mii_read_reg(dev, phy, i + 1, &data1);
-			tlan_mii_read_reg(dev, phy, i + 2, &data2);
-			tlan_mii_read_reg(dev, phy, i + 3, &data3);
+			__tlan_mii_read_reg(dev, phy, i, &data0);
+			__tlan_mii_read_reg(dev, phy, i + 1, &data1);
+			__tlan_mii_read_reg(dev, phy, i + 2, &data2);
+			__tlan_mii_read_reg(dev, phy, i + 3, &data3);
 			pr_info("   0x%02x 0x%04hx 0x%04hx 0x%04hx 0x%04hx\n",
 				i, data0, data1, data2, data3);
 		}
@@ -2417,7 +2419,15 @@ static void tlan_phy_print(struct net_device *dev)
 
 }
 
+static void tlan_phy_print(struct net_device *dev)
+{
+	struct tlan_priv *priv = netdev_priv(dev);
+	unsigned long flags;
 
+	spin_lock_irqsave(&priv->lock, flags);
+	__tlan_phy_print(dev);
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
 
 
 /*********************************************************************
@@ -2795,7 +2805,7 @@ these routines are based on the information in chap. 2 of the
 
 
 /***************************************************************
- *	tlan_mii_read_reg
+ *	__tlan_mii_read_reg
  *
  *	Returns:
  *		false	if ack received ok
@@ -2819,7 +2829,7 @@ these routines are based on the information in chap. 2 of the
  **************************************************************/
 
 static bool
-tlan_mii_read_reg(struct net_device *dev, u16 phy, u16 reg, u16 *val)
+__tlan_mii_read_reg(struct net_device *dev, u16 phy, u16 reg, u16 *val)
 {
 	u8	nack;
 	u16	sio, tmp;
@@ -2827,15 +2837,13 @@ tlan_mii_read_reg(struct net_device *dev, u16 phy, u16 reg, u16 *val)
 	bool	err;
 	int	minten;
 	struct tlan_priv *priv = netdev_priv(dev);
-	unsigned long flags = 0;
+
+	lockdep_assert_held(&priv->lock);
 
 	err = false;
 	outw(TLAN_NET_SIO, dev->base_addr + TLAN_DIO_ADR);
 	sio = dev->base_addr + TLAN_DIO_DATA + TLAN_NET_SIO;
 
-	if (!in_irq())
-		spin_lock_irqsave(&priv->lock, flags);
-
 	tlan_mii_sync(dev->base_addr);
 
 	minten = tlan_get_bit(TLAN_NET_SIO_MINTEN, sio);
@@ -2881,15 +2889,19 @@ tlan_mii_read_reg(struct net_device *dev, u16 phy, u16 reg, u16 *val)
 
 	*val = tmp;
 
-	if (!in_irq())
-		spin_unlock_irqrestore(&priv->lock, flags);
-
 	return err;
-
 }
 
+static void tlan_mii_read_reg(struct net_device *dev, u16 phy, u16 reg,
+			      u16 *val)
+{
+	struct tlan_priv *priv = netdev_priv(dev);
+	unsigned long flags;
 
-
+	spin_lock_irqsave(&priv->lock, flags);
+	__tlan_mii_read_reg(dev, phy, reg, val);
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
 
 /***************************************************************
  *	tlan_mii_send_data
@@ -2971,7 +2983,7 @@ static void tlan_mii_sync(u16 base_port)
 
 
 /***************************************************************
- *	tlan_mii_write_reg
+ *	__tlan_mii_write_reg
  *
  *	Returns:
  *		Nothing
@@ -2991,19 +3003,17 @@ static void tlan_mii_sync(u16 base_port)
  **************************************************************/
 
 static void
-tlan_mii_write_reg(struct net_device *dev, u16 phy, u16 reg, u16 val)
+__tlan_mii_write_reg(struct net_device *dev, u16 phy, u16 reg, u16 val)
 {
 	u16	sio;
 	int	minten;
-	unsigned long flags = 0;
 	struct tlan_priv *priv = netdev_priv(dev);
 
+	lockdep_assert_held(&priv->lock);
+
 	outw(TLAN_NET_SIO, dev->base_addr + TLAN_DIO_ADR);
 	sio = dev->base_addr + TLAN_DIO_DATA + TLAN_NET_SIO;
 
-	if (!in_irq())
-		spin_lock_irqsave(&priv->lock, flags);
-
 	tlan_mii_sync(dev->base_addr);
 
 	minten = tlan_get_bit(TLAN_NET_SIO_MINTEN, sio);
@@ -3024,12 +3034,18 @@ tlan_mii_write_reg(struct net_device *dev, u16 phy, u16 reg, u16 val)
 	if (minten)
 		tlan_set_bit(TLAN_NET_SIO_MINTEN, sio);
 
-	if (!in_irq())
-		spin_unlock_irqrestore(&priv->lock, flags);
-
 }
 
+static void
+tlan_mii_write_reg(struct net_device *dev, u16 phy, u16 reg, u16 val)
+{
+	struct tlan_priv *priv = netdev_priv(dev);
+	unsigned long flags;
 
+	spin_lock_irqsave(&priv->lock, flags);
+	__tlan_mii_write_reg(dev, phy, reg, val);
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
 
 
 /*****************************************************************************
-- 
2.28.0

[PATCH net-next 06/15] net: airo: Invoke airo_read_wireless_stats() directly

[Sebastian Andrzej Siewior]

airo_get_wireless_stats() is the iw_handler_if::get_wireless_stats()
callback of this driver. This callback was not allowed to sleep until
commit a160ee69c6a46 ("wext: let get_wireless_stats() sleep") in v2.6.32.

airo still delegates the readout to a thread, which is not longer
necessary.

Invoke airo_read_wireless_stats() directly from the callback and remove
the now unused JOB_WSTATS handling.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
---
 drivers/net/wireless/cisco/airo.c | 22 +++++-----------------
 1 file changed, 5 insertions(+), 17 deletions(-)

diff --git a/drivers/net/wireless/cisco/airo.c b/drivers/net/wireless/cisco/airo.c
index 87b9398b03fd4..ca423f3b6b3ea 100644
--- a/drivers/net/wireless/cisco/airo.c
+++ b/drivers/net/wireless/cisco/airo.c
@@ -1144,7 +1144,6 @@ static int airo_thread(void *data);
 static void timer_func(struct net_device *dev);
 static int airo_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 static struct iw_statistics *airo_get_wireless_stats(struct net_device *dev);
-static void airo_read_wireless_stats(struct airo_info *local);
 #ifdef CISCO_EXT
 static int readrids(struct net_device *dev, aironet_ioctl *comp);
 static int writerids(struct net_device *dev, aironet_ioctl *comp);
@@ -1200,7 +1199,6 @@ struct airo_info {
 #define JOB_MIC	5
 #define JOB_EVENT	6
 #define JOB_AUTOWEP	7
-#define JOB_WSTATS	8
 #define JOB_SCAN_RESULTS  9
 	unsigned long jobs;
 	int (*bap_read)(struct airo_info*, __le16 *pu16Dst, int bytelen,
@@ -3155,8 +3153,6 @@ static int airo_thread(void *data)
 			airo_end_xmit11(dev);
 		else if (test_bit(JOB_STATS, &ai->jobs))
 			airo_read_stats(dev);
-		else if (test_bit(JOB_WSTATS, &ai->jobs))
-			airo_read_wireless_stats(ai);
 		else if (test_bit(JOB_PROMISC, &ai->jobs))
 			airo_set_promisc(ai);
 		else if (test_bit(JOB_MIC, &ai->jobs))
@@ -7732,15 +7728,12 @@ static void airo_read_wireless_stats(struct airo_info *local)
 	__le32 *vals = stats_rid.vals;
 
 	/* Get stats out of the card */
-	clear_bit(JOB_WSTATS, &local->jobs);
-	if (local->power.event) {
-		up(&local->sem);
+	if (local->power.event)
 		return;
-	}
+
 	readCapabilityRid(local, &cap_rid, 0);
 	readStatusRid(local, &status_rid, 0);
 	readStatsRid(local, &stats_rid, RID_STATS, 0);
-	up(&local->sem);
 
 	/* The status */
 	local->wstats.status = le16_to_cpu(status_rid.mode);
@@ -7783,15 +7776,10 @@ static struct iw_statistics *airo_get_wireless_stats(struct net_device *dev)
 {
 	struct airo_info *local =  dev->ml_priv;
 
-	if (!test_bit(JOB_WSTATS, &local->jobs)) {
-		/* Get stats out of the card if available */
-		if (down_trylock(&local->sem) != 0) {
-			set_bit(JOB_WSTATS, &local->jobs);
-			wake_up_interruptible(&local->thr_wait);
-		} else
-			airo_read_wireless_stats(local);
+	if (!down_interruptible(&local->sem)) {
+		airo_read_wireless_stats(local);
+		up(&local->sem);
 	}
-
 	return &local->wstats;
 }
 
-- 
2.28.0

[PATCH net-next 07/15] net: airo: Always use JOB_STATS and JOB_EVENT

[Sebastian Andrzej Siewior]

issuecommand() is using in_atomic() to decide if it is safe to invoke
schedule() while waiting for the command to be accepted.

Usage of in_atomic() for this is only half correct as it can not detect all
condition where it is not allowed to schedule(). Also Linus clearly
requested that code which changes behaviour depending on context should
either be seperated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

Chasing the call chains leading up to issuecommand() is straight forward,
but airo_link() and airo_get_stats() would require to pass the context
through a quite large amount of functions.

As this is ancient hardware, avoid the churn and enforce the invocation of
those functions through the JOB machinery.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
---
 drivers/net/wireless/cisco/airo.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/net/wireless/cisco/airo.c b/drivers/net/wireless/cisco/airo.c
index ca423f3b6b3ea..369a6ca44d1ff 100644
--- a/drivers/net/wireless/cisco/airo.c
+++ b/drivers/net/wireless/cisco/airo.c
@@ -2286,12 +2286,8 @@ static struct net_device_stats *airo_get_stats(struct net_device *dev)
 	struct airo_info *local =  dev->ml_priv;
 
 	if (!test_bit(JOB_STATS, &local->jobs)) {
-		/* Get stats out of the card if available */
-		if (down_trylock(&local->sem) != 0) {
-			set_bit(JOB_STATS, &local->jobs);
-			wake_up_interruptible(&local->thr_wait);
-		} else
-			airo_read_stats(dev);
+		set_bit(JOB_STATS, &local->jobs);
+		wake_up_interruptible(&local->thr_wait);
 	}
 
 	return &dev->stats;
@@ -3277,11 +3273,9 @@ static void airo_handle_link(struct airo_info *ai)
 		set_bit(FLAG_UPDATE_UNI, &ai->flags);
 		set_bit(FLAG_UPDATE_MULTI, &ai->flags);
 
-		if (down_trylock(&ai->sem) != 0) {
-			set_bit(JOB_EVENT, &ai->jobs);
-			wake_up_interruptible(&ai->thr_wait);
-		} else
-			airo_send_event(ai->dev);
+		set_bit(JOB_EVENT, &ai->jobs);
+		wake_up_interruptible(&ai->thr_wait);
+
 		netif_carrier_on(ai->dev);
 	} else if (!scan_forceloss) {
 		if (auto_wep && !ai->expires) {
-- 
2.28.0

[PATCH net-next 08/15] net: airo: Replace in_atomic() usage.

[Sebastian Andrzej Siewior]

issuecommand() is using in_atomic() to decide if it is safe to invoke
schedule() while waiting for the command to be accepted.

Usage of in_atomic() for this is only half correct as it can not detect all
condition where it is not allowed to schedule(). Also Linus clearly
requested that code which changes behaviour depending on context should
either be seperated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

Add an may_sleep argument to issuecommand() indicating when it is save to
sleep and change schedule() to cond_resched() because it's pointless to
invoke schedule() if there is no request to reschedule.

Pass the may_sleep condition through the various call chains leading to
issuecommand().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
---
 drivers/net/wireless/cisco/airo.c | 86 +++++++++++++++++--------------
 1 file changed, 47 insertions(+), 39 deletions(-)

diff --git a/drivers/net/wireless/cisco/airo.c b/drivers/net/wireless/cisco/airo.c
index 369a6ca44d1ff..74acf9af2adb1 100644
--- a/drivers/net/wireless/cisco/airo.c
+++ b/drivers/net/wireless/cisco/airo.c
@@ -1115,7 +1115,8 @@ static int enable_MAC(struct airo_info *ai, int lock);
 static void disable_MAC(struct airo_info *ai, int lock);
 static void enable_interrupts(struct airo_info*);
 static void disable_interrupts(struct airo_info*);
-static u16 issuecommand(struct airo_info*, Cmd *pCmd, Resp *pRsp);
+static u16 issuecommand(struct airo_info*, Cmd *pCmd, Resp *pRsp,
+			bool may_sleep);
 static int bap_setup(struct airo_info*, u16 rid, u16 offset, int whichbap);
 static int aux_bap_read(struct airo_info*, __le16 *pu16Dst, int bytelen,
 			int whichbap);
@@ -1130,8 +1131,10 @@ static int PC4500_writerid(struct airo_info*, u16 rid, const void
 static int do_writerid(struct airo_info*, u16 rid, const void *rid_data,
 			int len, int dummy);
 static u16 transmit_allocate(struct airo_info*, int lenPayload, int raw);
-static int transmit_802_3_packet(struct airo_info*, int len, char *pPacket);
-static int transmit_802_11_packet(struct airo_info*, int len, char *pPacket);
+static int transmit_802_3_packet(struct airo_info*, int len, char *pPacket,
+				 bool may_sleep);
+static int transmit_802_11_packet(struct airo_info*, int len, char *pPacket,
+				  bool may_sleep);
 
 static int mpi_send_packet(struct net_device *dev);
 static void mpi_unmap_card(struct pci_dev *pci);
@@ -1753,7 +1756,7 @@ static int readBSSListRid(struct airo_info *ai, int first,
 		if (down_interruptible(&ai->sem))
 			return -ERESTARTSYS;
 		ai->list_bss_task = current;
-		issuecommand(ai, &cmd, &rsp);
+		issuecommand(ai, &cmd, &rsp, true);
 		up(&ai->sem);
 		/* Let the command take effect */
 		schedule_timeout_uninterruptible(3 * HZ);
@@ -2096,7 +2099,7 @@ static void get_tx_error(struct airo_info *ai, s32 fid)
 	}
 }
 
-static void airo_end_xmit(struct net_device *dev)
+static void airo_end_xmit(struct net_device *dev, bool may_sleep)
 {
 	u16 status;
 	int i;
@@ -2107,7 +2110,7 @@ static void airo_end_xmit(struct net_device *dev)
 
 	clear_bit(JOB_XMIT, &priv->jobs);
 	clear_bit(FLAG_PENDING_XMIT, &priv->flags);
-	status = transmit_802_3_packet (priv, fids[fid], skb->data);
+	status = transmit_802_3_packet(priv, fids[fid], skb->data, may_sleep);
 	up(&priv->sem);
 
 	i = 0;
@@ -2164,11 +2167,11 @@ static netdev_tx_t airo_start_xmit(struct sk_buff *skb,
 		set_bit(JOB_XMIT, &priv->jobs);
 		wake_up_interruptible(&priv->thr_wait);
 	} else
-		airo_end_xmit(dev);
+		airo_end_xmit(dev, false);
 	return NETDEV_TX_OK;
 }
 
-static void airo_end_xmit11(struct net_device *dev)
+static void airo_end_xmit11(struct net_device *dev, bool may_sleep)
 {
 	u16 status;
 	int i;
@@ -2179,7 +2182,7 @@ static void airo_end_xmit11(struct net_device *dev)
 
 	clear_bit(JOB_XMIT11, &priv->jobs);
 	clear_bit(FLAG_PENDING_XMIT11, &priv->flags);
-	status = transmit_802_11_packet (priv, fids[fid], skb->data);
+	status = transmit_802_11_packet(priv, fids[fid], skb->data, may_sleep);
 	up(&priv->sem);
 
 	i = MAX_FIDS / 2;
@@ -2243,7 +2246,7 @@ static netdev_tx_t airo_start_xmit11(struct sk_buff *skb,
 		set_bit(JOB_XMIT11, &priv->jobs);
 		wake_up_interruptible(&priv->thr_wait);
 	} else
-		airo_end_xmit11(dev);
+		airo_end_xmit11(dev, false);
 	return NETDEV_TX_OK;
 }
 
@@ -2293,7 +2296,7 @@ static struct net_device_stats *airo_get_stats(struct net_device *dev)
 	return &dev->stats;
 }
 
-static void airo_set_promisc(struct airo_info *ai)
+static void airo_set_promisc(struct airo_info *ai, bool may_sleep)
 {
 	Cmd cmd;
 	Resp rsp;
@@ -2302,7 +2305,7 @@ static void airo_set_promisc(struct airo_info *ai)
 	cmd.cmd = CMD_SETMODE;
 	clear_bit(JOB_PROMISC, &ai->jobs);
 	cmd.parm0=(ai->flags&IFF_PROMISC) ? PROMISC : NOPROMISC;
-	issuecommand(ai, &cmd, &rsp);
+	issuecommand(ai, &cmd, &rsp, may_sleep);
 	up(&ai->sem);
 }
 
@@ -2316,7 +2319,7 @@ static void airo_set_multicast_list(struct net_device *dev)
 			set_bit(JOB_PROMISC, &ai->jobs);
 			wake_up_interruptible(&ai->thr_wait);
 		} else
-			airo_set_promisc(ai);
+			airo_set_promisc(ai, false);
 	}
 
 	if ((dev->flags&IFF_ALLMULTI) || !netdev_mc_empty(dev)) {
@@ -2476,7 +2479,7 @@ static int mpi_init_descriptors (struct airo_info *ai)
 	cmd.parm0 = FID_RX;
 	cmd.parm1 = (ai->rxfids[0].card_ram_off - ai->pciaux);
 	cmd.parm2 = MPI_MAX_FIDS;
-	rc = issuecommand(ai, &cmd, &rsp);
+	rc = issuecommand(ai, &cmd, &rsp, true);
 	if (rc != SUCCESS) {
 		airo_print_err(ai->dev->name, "Couldn't allocate RX FID");
 		return rc;
@@ -2504,7 +2507,7 @@ static int mpi_init_descriptors (struct airo_info *ai)
 	}
 	ai->txfids[i-1].tx_desc.eoc = 1; /* Last descriptor has EOC set */
 
-	rc = issuecommand(ai, &cmd, &rsp);
+	rc = issuecommand(ai, &cmd, &rsp, true);
 	if (rc != SUCCESS) {
 		airo_print_err(ai->dev->name, "Couldn't allocate TX FID");
 		return rc;
@@ -2518,7 +2521,7 @@ static int mpi_init_descriptors (struct airo_info *ai)
 	cmd.parm0 = RID_RW;
 	cmd.parm1 = (ai->config_desc.card_ram_off - ai->pciaux);
 	cmd.parm2 = 1; /* Magic number... */
-	rc = issuecommand(ai, &cmd, &rsp);
+	rc = issuecommand(ai, &cmd, &rsp, true);
 	if (rc != SUCCESS) {
 		airo_print_err(ai->dev->name, "Couldn't allocate RID");
 		return rc;
@@ -3144,13 +3147,13 @@ static int airo_thread(void *data)
 		}
 
 		if (test_bit(JOB_XMIT, &ai->jobs))
-			airo_end_xmit(dev);
+			airo_end_xmit(dev, true);
 		else if (test_bit(JOB_XMIT11, &ai->jobs))
-			airo_end_xmit11(dev);
+			airo_end_xmit11(dev, true);
 		else if (test_bit(JOB_STATS, &ai->jobs))
 			airo_read_stats(dev);
 		else if (test_bit(JOB_PROMISC, &ai->jobs))
-			airo_set_promisc(ai);
+			airo_set_promisc(ai, true);
 		else if (test_bit(JOB_MIC, &ai->jobs))
 			micinit(ai);
 		else if (test_bit(JOB_EVENT, &ai->jobs))
@@ -3599,7 +3602,7 @@ static int enable_MAC(struct airo_info *ai, int lock)
 	if (!test_bit(FLAG_ENABLED, &ai->flags)) {
 		memset(&cmd, 0, sizeof(cmd));
 		cmd.cmd = MAC_ENABLE;
-		rc = issuecommand(ai, &cmd, &rsp);
+		rc = issuecommand(ai, &cmd, &rsp, true);
 		if (rc == SUCCESS)
 			set_bit(FLAG_ENABLED, &ai->flags);
 	} else
@@ -3631,7 +3634,7 @@ static void disable_MAC(struct airo_info *ai, int lock)
 			netif_carrier_off(ai->dev);
 		memset(&cmd, 0, sizeof(cmd));
 		cmd.cmd = MAC_DISABLE; // disable in case already enabled
-		issuecommand(ai, &cmd, &rsp);
+		issuecommand(ai, &cmd, &rsp, true);
 		clear_bit(FLAG_ENABLED, &ai->flags);
 	}
 	if (lock == 1)
@@ -3834,7 +3837,7 @@ static u16 setup_card(struct airo_info *ai, u8 *mac, int lock)
 	cmd.parm0 = cmd.parm1 = cmd.parm2 = 0;
 	if (lock && down_interruptible(&ai->sem))
 		return ERROR;
-	if (issuecommand(ai, &cmd, &rsp) != SUCCESS) {
+	if (issuecommand(ai, &cmd, &rsp, true) != SUCCESS) {
 		if (lock)
 			up(&ai->sem);
 		return ERROR;
@@ -3844,7 +3847,7 @@ static u16 setup_card(struct airo_info *ai, u8 *mac, int lock)
 	// Let's figure out if we need to use the AUX port
 	if (!test_bit(FLAG_MPI,&ai->flags)) {
 		cmd.cmd = CMD_ENABLEAUX;
-		if (issuecommand(ai, &cmd, &rsp) != SUCCESS) {
+		if (issuecommand(ai, &cmd, &rsp, true) != SUCCESS) {
 			if (lock)
 				up(&ai->sem);
 			airo_print_err(ai->dev->name, "Error checking for AUX port");
@@ -3956,7 +3959,8 @@ static u16 setup_card(struct airo_info *ai, u8 *mac, int lock)
 	return SUCCESS;
 }
 
-static u16 issuecommand(struct airo_info *ai, Cmd *pCmd, Resp *pRsp)
+static u16 issuecommand(struct airo_info *ai, Cmd *pCmd, Resp *pRsp,
+			bool may_sleep)
 {
         // Im really paranoid about letting it run forever!
 	int max_tries = 600000;
@@ -3973,8 +3977,8 @@ static u16 issuecommand(struct airo_info *ai, Cmd *pCmd, Resp *pRsp)
 		if ((IN4500(ai, COMMAND)) == pCmd->cmd)
 			// PC4500 didn't notice command, try again
 			OUT4500(ai, COMMAND, pCmd->cmd);
-		if (!in_atomic() && (max_tries & 255) == 0)
-			schedule();
+		if (may_sleep && (max_tries & 255) == 0)
+			cond_resched();
 	}
 
 	if (max_tries == -1) {
@@ -4131,7 +4135,7 @@ static int PC4500_accessrid(struct airo_info *ai, u16 rid, u16 accmd)
 	memset(&cmd, 0, sizeof(cmd));
 	cmd.cmd = accmd;
 	cmd.parm0 = rid;
-	status = issuecommand(ai, &cmd, &rsp);
+	status = issuecommand(ai, &cmd, &rsp, true);
 	if (status != 0) return status;
 	if ((rsp.status & 0x7F00) != 0) {
 		return (accmd << 8) + (rsp.rsp0 & 0xFF);
@@ -4167,7 +4171,7 @@ static int PC4500_readrid(struct airo_info *ai, u16 rid, void *pBuf, int len, in
 		memcpy_toio(ai->config_desc.card_ram_off,
 			&ai->config_desc.rid_desc, sizeof(Rid));
 
-		rc = issuecommand(ai, &cmd, &rsp);
+		rc = issuecommand(ai, &cmd, &rsp, true);
 
 		if (rsp.status & 0x7f00)
 			rc = rsp.rsp0;
@@ -4246,7 +4250,7 @@ static int PC4500_writerid(struct airo_info *ai, u16 rid,
 			memcpy(ai->config_desc.virtual_host_addr,
 				pBuf, len);
 
-			rc = issuecommand(ai, &cmd, &rsp);
+			rc = issuecommand(ai, &cmd, &rsp, true);
 			if ((rc & 0xff00) != 0) {
 				airo_print_err(ai->dev->name, "%s: Write rid Error %d",
 						__func__, rc);
@@ -4292,7 +4296,7 @@ static u16 transmit_allocate(struct airo_info *ai, int lenPayload, int raw)
 	cmd.parm0 = lenPayload;
 	if (down_interruptible(&ai->sem))
 		return ERROR;
-	if (issuecommand(ai, &cmd, &rsp) != SUCCESS) {
+	if (issuecommand(ai, &cmd, &rsp, true) != SUCCESS) {
 		txFid = ERROR;
 		goto done;
 	}
@@ -4338,7 +4342,8 @@ static u16 transmit_allocate(struct airo_info *ai, int lenPayload, int raw)
 /* In general BAP1 is dedicated to transmiting packets.  However,
    since we need a BAP when accessing RIDs, we also use BAP1 for that.
    Make sure the BAP1 spinlock is held when this is called. */
-static int transmit_802_3_packet(struct airo_info *ai, int len, char *pPacket)
+static int transmit_802_3_packet(struct airo_info *ai, int len, char *pPacket,
+				 bool may_sleep)
 {
 	__le16 payloadLen;
 	Cmd cmd;
@@ -4376,12 +4381,14 @@ static int transmit_802_3_packet(struct airo_info *ai, int len, char *pPacket)
 	memset(&cmd, 0, sizeof(cmd));
 	cmd.cmd = CMD_TRANSMIT;
 	cmd.parm0 = txFid;
-	if (issuecommand(ai, &cmd, &rsp) != SUCCESS) return ERROR;
+	if (issuecommand(ai, &cmd, &rsp, may_sleep) != SUCCESS)
+		return ERROR;
 	if ((rsp.status & 0xFF00) != 0) return ERROR;
 	return SUCCESS;
 }
 
-static int transmit_802_11_packet(struct airo_info *ai, int len, char *pPacket)
+static int transmit_802_11_packet(struct airo_info *ai, int len, char *pPacket,
+				  bool may_sleep)
 {
 	__le16 fc, payloadLen;
 	Cmd cmd;
@@ -4416,7 +4423,8 @@ static int transmit_802_11_packet(struct airo_info *ai, int len, char *pPacket)
 	memset(&cmd, 0, sizeof(cmd));
 	cmd.cmd = CMD_TRANSMIT;
 	cmd.parm0 = txFid;
-	if (issuecommand(ai, &cmd, &rsp) != SUCCESS) return ERROR;
+	if (issuecommand(ai, &cmd, &rsp, may_sleep) != SUCCESS)
+		return ERROR;
 	if ((rsp.status & 0xFF00) != 0) return ERROR;
 	return SUCCESS;
 }
@@ -5480,7 +5488,7 @@ static int proc_BSSList_open(struct inode *inode, struct file *file)
 				kfree(file->private_data);
 				return -ERESTARTSYS;
 			}
-			issuecommand(ai, &cmd, &rsp);
+			issuecommand(ai, &cmd, &rsp, true);
 			up(&ai->sem);
 			data->readlen = 0;
 			return 0;
@@ -5617,7 +5625,7 @@ static int __maybe_unused airo_pci_suspend(struct device *dev_d)
 	netif_device_detach(dev);
 	ai->power = PMSG_SUSPEND;
 	cmd.cmd = HOSTSLEEP;
-	issuecommand(ai, &cmd, &rsp);
+	issuecommand(ai, &cmd, &rsp, true);
 
 	device_wakeup_enable(dev_d);
 	return 0;
@@ -5960,7 +5968,7 @@ static int airo_set_wap(struct net_device *dev,
 		cmd.cmd = CMD_LOSE_SYNC;
 		if (down_interruptible(&local->sem))
 			return -ERESTARTSYS;
-		issuecommand(local, &cmd, &rsp);
+		issuecommand(local, &cmd, &rsp, true);
 		up(&local->sem);
 	} else {
 		memset(APList_rid, 0, sizeof(*APList_rid));
@@ -7258,7 +7266,7 @@ static int airo_set_scan(struct net_device *dev,
 	ai->scan_timeout = RUN_AT(3*HZ);
 	memset(&cmd, 0, sizeof(cmd));
 	cmd.cmd = CMD_LISTBSS;
-	issuecommand(ai, &cmd, &rsp);
+	issuecommand(ai, &cmd, &rsp, true);
 	wake = 1;
 
 out:
@@ -7525,7 +7533,7 @@ static int airo_config_commit(struct net_device *dev,
 	writeConfigRid(local, 0);
 	enable_MAC(local, 0);
 	if (test_bit (FLAG_RESET, &local->flags))
-		airo_set_promisc(local);
+		airo_set_promisc(local, true);
 	else
 		up(&local->sem);
 
-- 
2.28.0

[PATCH net-next 09/15] net: hostap: Remove in_atomic() check.

[Sebastian Andrzej Siewior]

hostap_get_wireless_stats() is the iw_handler_if::get_wireless_stats()
callback of this driver. This callback was not allowed to sleep until
commit a160ee69c6a46 ("wext: let get_wireless_stats() sleep") in v2.6.32.

Remove the therefore pointless in_atomic() check.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Jouni Malinen <j@w1.fi>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
---
 drivers/net/wireless/intersil/hostap/hostap_ioctl.c | 13 +------------
 1 file changed, 1 insertion(+), 12 deletions(-)

diff --git a/drivers/net/wireless/intersil/hostap/hostap_ioctl.c b/drivers/net/wireless/intersil/hostap/hostap_ioctl.c
index 514c7b01dbf6f..49766b285230c 100644
--- a/drivers/net/wireless/intersil/hostap/hostap_ioctl.c
+++ b/drivers/net/wireless/intersil/hostap/hostap_ioctl.c
@@ -44,19 +44,8 @@ static struct iw_statistics *hostap_get_wireless_stats(struct net_device *dev)
 
 	if (local->iw_mode != IW_MODE_MASTER &&
 	    local->iw_mode != IW_MODE_REPEAT) {
-		int update = 1;
-#ifdef in_atomic
-		/* RID reading might sleep and it must not be called in
-		 * interrupt context or while atomic. However, this
-		 * function seems to be called while atomic (at least in Linux
-		 * 2.5.59). Update signal quality values only if in suitable
-		 * context. Otherwise, previous values read from tick timer
-		 * will be used. */
-		if (in_atomic())
-			update = 0;
-#endif /* in_atomic */
 
-		if (update && prism2_update_comms_qual(dev) == 0)
+		if (prism2_update_comms_qual(dev) == 0)
 			wstats->qual.updated = IW_QUAL_ALL_UPDATED |
 				IW_QUAL_DBM;
 
-- 
2.28.0

[PATCH net-next 10/15] net: zd1211rw: Remove in_atomic() usage.

[Sebastian Andrzej Siewior]

The usage of in_atomic() in driver code is deprecated as it can not
always detect all states where it is not allowed to sleep.

All callers are in premptible thread context and all functions invoke core
functions which have checks for invalid calling contexts already.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Daniel Drake <dsd@gentoo.org>
Cc: Ulrich Kunitz <kune@deine-taler.de>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
---
 drivers/net/wireless/zydas/zd1211rw/zd_usb.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/drivers/net/wireless/zydas/zd1211rw/zd_usb.c b/drivers/net/wireless/zydas/zd1211rw/zd_usb.c
index 66367ab7e4c1e..5c4cd0e1adebb 100644
--- a/drivers/net/wireless/zydas/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zydas/zd1211rw/zd_usb.c
@@ -1711,11 +1711,6 @@ int zd_usb_ioread16v(struct zd_usb *usb, u16 *values,
 			 count, USB_MAX_IOREAD16_COUNT);
 		return -EINVAL;
 	}
-	if (in_atomic()) {
-		dev_dbg_f(zd_usb_dev(usb),
-			 "error: io in atomic context not supported\n");
-		return -EWOULDBLOCK;
-	}
 	if (!usb_int_enabled(usb)) {
 		dev_dbg_f(zd_usb_dev(usb),
 			  "error: usb interrupt not enabled\n");
@@ -1882,11 +1877,6 @@ int zd_usb_iowrite16v_async(struct zd_usb *usb, const struct zd_ioreq16 *ioreqs,
 			count, USB_MAX_IOWRITE16_COUNT);
 		return -EINVAL;
 	}
-	if (in_atomic()) {
-		dev_dbg_f(zd_usb_dev(usb),
-			"error: io in atomic context not supported\n");
-		return -EWOULDBLOCK;
-	}
 
 	udev = zd_usb_to_usbdev(usb);
 
@@ -1966,11 +1956,6 @@ int zd_usb_rfwrite(struct zd_usb *usb, u32 value, u8 bits)
 	int i, req_len, actual_req_len;
 	u16 bit_value_template;
 
-	if (in_atomic()) {
-		dev_dbg_f(zd_usb_dev(usb),
-			"error: io in atomic context not supported\n");
-		return -EWOULDBLOCK;
-	}
 	if (bits < USB_MIN_RFWRITE_BIT_COUNT) {
 		dev_dbg_f(zd_usb_dev(usb),
 			"error: bits %d are smaller than"
-- 
2.28.0

[PATCH net-next 11/15] net: rtlwifi: Remove in_interrupt() usage in is_any_client_connect_to_ap().

[Sebastian Andrzej Siewior]

is_any_client_connect_to_ap() is using in_interrupt() to determine whether
it should acquire the lock prior accessing the list.

The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be separated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

The function is called from:

    - halbtc_get()

    - halbtc_get()
        halbtc_get_wifi_link_status()

    - halbtc_display_dbg_msg()
	halbtc_display_wifi_status()
          halbtc_get_wifi_link_status()

All top level callers are part of the btc_coexist callback inferface and
are never invoked from a context which can hold the lock already.

The contexts which hold the lock are either protecting list add/del
operations or list walks which never call into any of the btc_coexist
interfaces.

In fact the conditional is outright dangerous because if this function
would be invoked from a BH disabled context the check would avoid taking
the lock while on another CPU the list could be manipulated under the lock.

Remove the in_interrupt() check and always acquire the lock.

To simplify the code further use list_empty() instead of walking the list
and counting the entries just to check the count for > 0 at the end.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Ping-Ke Shih <pkshih@realtek.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
---
 .../realtek/rtlwifi/btcoexist/halbtcoutsrc.c  | 25 +++++--------------
 1 file changed, 6 insertions(+), 19 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c
index 2c05369b79e4d..2155a6699ef8d 100644
--- a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c
+++ b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c
@@ -47,30 +47,17 @@ static bool is_any_client_connect_to_ap(struct btc_coexist *btcoexist)
 {
 	struct rtl_priv *rtlpriv = btcoexist->adapter;
 	struct rtl_mac *mac = rtl_mac(rtlpriv);
-	struct rtl_sta_info *drv_priv;
-	u8 cnt = 0;
+	bool ret = false;
 
 	if (mac->opmode == NL80211_IFTYPE_ADHOC ||
 	    mac->opmode == NL80211_IFTYPE_MESH_POINT ||
 	    mac->opmode == NL80211_IFTYPE_AP) {
-		if (in_interrupt() > 0) {
-			list_for_each_entry(drv_priv, &rtlpriv->entry_list,
-					    list) {
-				cnt++;
-			}
-		} else {
-			spin_lock_bh(&rtlpriv->locks.entry_list_lock);
-			list_for_each_entry(drv_priv, &rtlpriv->entry_list,
-					    list) {
-				cnt++;
-			}
-			spin_unlock_bh(&rtlpriv->locks.entry_list_lock);
-		}
+		spin_lock_bh(&rtlpriv->locks.entry_list_lock);
+		if (!list_empty(&rtlpriv->entry_list))
+			ret = true;
+		spin_unlock_bh(&rtlpriv->locks.entry_list_lock);
 	}
-	if (cnt > 0)
-		return true;
-	else
-		return false;
+	return ret;
 }
 
 static bool halbtc_legacy(struct rtl_priv *adapter)
-- 
2.28.0

[PATCH net-next 12/15] net: rtlwifi: Remove in_interrupt() usage in halbtc_send_bt_mp_operation()

[Sebastian Andrzej Siewior]

halbtc_send_bt_mp_operation() uses in_interrupt() to determine if it is
safe to invoke wait_for_completion().

The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be separated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

Aside of that in_interrupt() is not correct as it does not catch preempt
disabled regions which neither can sleep.

halbtc_send_bt_mp_operation() is called from:

 rtl_watchdog_wq_callback()
   rtl_btc_periodical()
     halbtc_get()
       case BTC_GET_U4_BT_PATCH_VER:
         halbtc_get_bt_patch_version()

 which is preemtible context.

   rtl_c2h_content_parsing()
     btc_ops->btc_btinfo_notify()
       rtl_btc_btinfo_notify()
         exhalbtc_bt_info_notify()
           ex_btc8723b1ant_bt_info_notify()
	   ex_btc8821a1ant_bt_info_notify()
	   ex_btc8821a2ant_bt_info_notify()
             btcoexist->btc_set_bt_reg()
               halbtc_set_bt_reg()

   rtl_c2h_content_parsing() is in turn called from:

   rtl_c2hcmd_wq_callback()
     rtl_c2hcmd_launcher()

   which is preemptible context and from:

   _rtl_pci_rx_interrupt
     rtl_c2hcmd_enqueue()

   which is obviously not preemptible but limited to C2H_BT_MP commands
   which does invoke rtl_c2h_content_parsing().

Aside of that it can be reached from:

     halbtc_get()
       case BTC_GET_U4_SUPPORTED_FEATURE:
         halbtc_get_bt_coex_supported_feature()
       case BTC_GET_U4_BT_FORBIDDEN_SLOT_VAL:
         halbtc_get_bt_forbidden_slot_val()
       case BTC_GET_U4_BT_DEVICE_INFO:
         halbtc_get_bt_device_info()
       case BTC_GET_U4_SUPPORTED_VERSION:
         halbtc_get_bt_coex_supported_version()
       case BTC_GET_U4_SUPPORTED_FEATURE:
         halbtc_get_bt_coex_supported_feature()

   btcoexist->btc_get_bt_afh_map_from_bt()
     halbtc_get_bt_afh_map_from_bt()

   btcoexist->btc_get_ble_scan_para_from_bt()
     halbtc_get_ble_scan_para_from_bt()

   btcoexist->btc_get_ble_scan_type_from_bt()
     halbtc_get_ble_scan_type_from_bt()

   btcoexist->btc_get_ant_det_val_from_bt()
     halbtc_get_ant_det_val_from_bt()

   btcoexist->btc_get_bt_coex_supported_version()
     halbtc_get_bt_coex_supported_version()

   btcoexist->btc_get_bt_coex_supported_feature()
     halbtc_get_bt_coex_supported_feature()

None of these have a caller. Welcome to the wonderful world of HALs and
onion layers.

Remove in_interrupt() check.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Ping-Ke Shih <pkshih@realtek.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
---
 drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c
index 2155a6699ef8d..be4c0e60d44d1 100644
--- a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c
+++ b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c
@@ -240,9 +240,6 @@ bool halbtc_send_bt_mp_operation(struct btc_coexist *btcoexist, u8 op_code,
 	rtl_dbg(rtlpriv, COMP_BT_COEXIST, DBG_LOUD,
 		"btmpinfo wait req_num=%d wait=%ld\n", req_num, wait_ms);
 
-	if (in_interrupt())
-		return false;
-
 	if (wait_for_completion_timeout(&btcoexist->bt_mp_comp,
 					msecs_to_jiffies(wait_ms)) == 0) {
 		rtl_dbg(rtlpriv, COMP_BT_COEXIST, DBG_DMESG,
-- 
2.28.0

[PATCH net-next 13/15] soc/fsl/qbman: Add an argument to signal if NAPI processing is required.

[Sebastian Andrzej Siewior]

dpaa_eth_napi_schedule() and caam_qi_napi_schedule() schedule NAPI if
invoked from:

 - Hard interrupt context
 - Any context which is not serving soft interrupts

Any context which is not serving soft interrupts includes hard interrupts
so the in_irq() check is redundant. caam_qi_napi_schedule() has a comment
about this:

        /*
         * In case of threaded ISR, for RT kernels in_irq() does not return
         * appropriate value, so use in_serving_softirq to distinguish between
         * softirq and irq contexts.
         */
         if (in_irq() || !in_serving_softirq())

This has nothing to do with RT. Even on a non RT kernel force threaded
interrupts run obviously in thread context and therefore in_irq() returns
false when invoked from the handler.

The extension of the in_irq() check with !in_serving_softirq() was there
when the drivers were added, but in the out of tree FSL BSP the original
condition was in_irq() which got extended due to failures on RT.

The usage of in_xxx() in drivers is phased out and Linus clearly requested
that code which changes behaviour depending on context should either be
seperated or the context be conveyed in an argument passed by the caller,
which usually knows the context. Right he is, the above construct is
clearly showing why.

The following callchains have been analyzed to end up in
dpaa_eth_napi_schedule():

qman_p_poll_dqrr()
  __poll_portal_fast()
    fq->cb.dqrr()
       dpaa_eth_napi_schedule()

portal_isr()
  __poll_portal_fast()
    fq->cb.dqrr()
       dpaa_eth_napi_schedule()

Both need to schedule NAPI.
The crypto part has another code path leading up to this:
  kill_fq()
     empty_retired_fq()
       qman_p_poll_dqrr()
         __poll_portal_fast()
            fq->cb.dqrr()
               dpaa_eth_napi_schedule()

kill_fq() is called from task context and ends up scheduling NAPI, but
that's pointless and an unintended side effect of the !in_serving_softirq()
check.

The code path:
  caam_qi_poll() -> qman_p_poll_dqrr()

is invoked from NAPI and I *assume* from crypto's NAPI device and not
from qbman's NAPI device. I *guess* it is okay to skip scheduling NAPI
(because this is what happens now) but could be changed if it is wrong
due to `budget' handling.

Add an argument to __poll_portal_fast() which is true if NAPI needs to be
scheduled. This requires propagating the value to the caller including
`qman_cb_dqrr' typedef which is used by the dpaa and the crypto driver.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: "Horia Geantă" <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Madalin Bucur <madalin.bucur@nxp.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Li Yang <leoyang.li@nxp.com>
Cc: linux-crypto@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/crypto/caam/qi.c                       |  3 ++-
 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 12 ++++++++----
 drivers/soc/fsl/qbman/qman.c                   | 12 ++++++------
 drivers/soc/fsl/qbman/qman_test_api.c          |  6 ++++--
 drivers/soc/fsl/qbman/qman_test_stash.c        |  6 ++++--
 include/soc/fsl/qman.h                         |  3 ++-
 6 files changed, 26 insertions(+), 16 deletions(-)

diff --git a/drivers/crypto/caam/qi.c b/drivers/crypto/caam/qi.c
index ec53528d82058..09ea398304c8b 100644
--- a/drivers/crypto/caam/qi.c
+++ b/drivers/crypto/caam/qi.c
@@ -564,7 +564,8 @@ static int caam_qi_napi_schedule(struct qman_portal *p, struct caam_napi *np)
 
 static enum qman_cb_dqrr_result caam_rsp_fq_dqrr_cb(struct qman_portal *p,
 						    struct qman_fq *rsp_fq,
-						    const struct qm_dqrr_entry *dqrr)
+						    const struct qm_dqrr_entry *dqrr,
+						    bool napi)
 {
 	struct caam_napi *caam_napi = raw_cpu_ptr(&pcpu_qipriv.caam_napi);
 	struct caam_drv_req *drv_req;
diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index 06cc863f4dd63..27835310b718e 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -2316,7 +2316,8 @@ static inline int dpaa_eth_napi_schedule(struct dpaa_percpu_priv *percpu_priv,
 
 static enum qman_cb_dqrr_result rx_error_dqrr(struct qman_portal *portal,
 					      struct qman_fq *fq,
-					      const struct qm_dqrr_entry *dq)
+					      const struct qm_dqrr_entry *dq,
+					      bool napi)
 {
 	struct dpaa_fq *dpaa_fq = container_of(fq, struct dpaa_fq, fq_base);
 	struct dpaa_percpu_priv *percpu_priv;
@@ -2343,7 +2344,8 @@ static enum qman_cb_dqrr_result rx_error_dqrr(struct qman_portal *portal,
 
 static enum qman_cb_dqrr_result rx_default_dqrr(struct qman_portal *portal,
 						struct qman_fq *fq,
-						const struct qm_dqrr_entry *dq)
+						const struct qm_dqrr_entry *dq,
+						bool napi)
 {
 	struct skb_shared_hwtstamps *shhwtstamps;
 	struct rtnl_link_stats64 *percpu_stats;
@@ -2460,7 +2462,8 @@ static enum qman_cb_dqrr_result rx_default_dqrr(struct qman_portal *portal,
 
 static enum qman_cb_dqrr_result conf_error_dqrr(struct qman_portal *portal,
 						struct qman_fq *fq,
-						const struct qm_dqrr_entry *dq)
+						const struct qm_dqrr_entry *dq,
+						bool napi)
 {
 	struct dpaa_percpu_priv *percpu_priv;
 	struct net_device *net_dev;
@@ -2481,7 +2484,8 @@ static enum qman_cb_dqrr_result conf_error_dqrr(struct qman_portal *portal,
 
 static enum qman_cb_dqrr_result conf_dflt_dqrr(struct qman_portal *portal,
 					       struct qman_fq *fq,
-					       const struct qm_dqrr_entry *dq)
+					       const struct qm_dqrr_entry *dq,
+					       bool napi)
 {
 	struct dpaa_percpu_priv *percpu_priv;
 	struct net_device *net_dev;
diff --git a/drivers/soc/fsl/qbman/qman.c b/drivers/soc/fsl/qbman/qman.c
index 9888a70618730..a92bd032fc36a 100644
--- a/drivers/soc/fsl/qbman/qman.c
+++ b/drivers/soc/fsl/qbman/qman.c
@@ -1159,7 +1159,7 @@ static u32 fq_to_tag(struct qman_fq *fq)
 
 static u32 __poll_portal_slow(struct qman_portal *p, u32 is);
 static inline unsigned int __poll_portal_fast(struct qman_portal *p,
-					unsigned int poll_limit);
+					unsigned int poll_limit, bool napi);
 static void qm_congestion_task(struct work_struct *work);
 static void qm_mr_process_task(struct work_struct *work);
 
@@ -1174,7 +1174,7 @@ static irqreturn_t portal_isr(int irq, void *ptr)
 
 	/* DQRR-handling if it's interrupt-driven */
 	if (is & QM_PIRQ_DQRI) {
-		__poll_portal_fast(p, QMAN_POLL_LIMIT);
+		__poll_portal_fast(p, QMAN_POLL_LIMIT, true);
 		clear = QM_DQAVAIL_MASK | QM_PIRQ_DQRI;
 	}
 	/* Handling of anything else that's interrupt-driven */
@@ -1602,7 +1602,7 @@ static noinline void clear_vdqcr(struct qman_portal *p, struct qman_fq *fq)
  * user callbacks to call into any QMan API.
  */
 static inline unsigned int __poll_portal_fast(struct qman_portal *p,
-					unsigned int poll_limit)
+					unsigned int poll_limit, bool napi)
 {
 	const struct qm_dqrr_entry *dq;
 	struct qman_fq *fq;
@@ -1636,7 +1636,7 @@ static inline unsigned int __poll_portal_fast(struct qman_portal *p,
 			 * and we don't want multiple if()s in the critical
 			 * path (SDQCR).
 			 */
-			res = fq->cb.dqrr(p, fq, dq);
+			res = fq->cb.dqrr(p, fq, dq, napi);
 			if (res == qman_cb_dqrr_stop)
 				break;
 			/* Check for VDQCR completion */
@@ -1646,7 +1646,7 @@ static inline unsigned int __poll_portal_fast(struct qman_portal *p,
 			/* SDQCR: context_b points to the FQ */
 			fq = tag_to_fq(be32_to_cpu(dq->context_b));
 			/* Now let the callback do its stuff */
-			res = fq->cb.dqrr(p, fq, dq);
+			res = fq->cb.dqrr(p, fq, dq, napi);
 			/*
 			 * The callback can request that we exit without
 			 * consuming this entry nor advancing;
@@ -1753,7 +1753,7 @@ EXPORT_SYMBOL(qman_start_using_portal);
 
 int qman_p_poll_dqrr(struct qman_portal *p, unsigned int limit)
 {
-	return __poll_portal_fast(p, limit);
+	return __poll_portal_fast(p, limit, false);
 }
 EXPORT_SYMBOL(qman_p_poll_dqrr);
 
diff --git a/drivers/soc/fsl/qbman/qman_test_api.c b/drivers/soc/fsl/qbman/qman_test_api.c
index 7066b2f1467cc..93eb86923e44f 100644
--- a/drivers/soc/fsl/qbman/qman_test_api.c
+++ b/drivers/soc/fsl/qbman/qman_test_api.c
@@ -45,7 +45,8 @@
 
 static enum qman_cb_dqrr_result cb_dqrr(struct qman_portal *,
 					struct qman_fq *,
-					const struct qm_dqrr_entry *);
+					const struct qm_dqrr_entry *,
+					bool napi);
 static void cb_ern(struct qman_portal *, struct qman_fq *,
 		   const union qm_mr_entry *);
 static void cb_fqs(struct qman_portal *, struct qman_fq *,
@@ -208,7 +209,8 @@ int qman_test_api(void)
 
 static enum qman_cb_dqrr_result cb_dqrr(struct qman_portal *p,
 					struct qman_fq *fq,
-					const struct qm_dqrr_entry *dq)
+					const struct qm_dqrr_entry *dq,
+					bool napi)
 {
 	if (WARN_ON(fd_neq(&fd_dq, &dq->fd))) {
 		pr_err("BADNESS: dequeued frame doesn't match;\n");
diff --git a/drivers/soc/fsl/qbman/qman_test_stash.c b/drivers/soc/fsl/qbman/qman_test_stash.c
index e87b65403b672..9b8caceedf7f3 100644
--- a/drivers/soc/fsl/qbman/qman_test_stash.c
+++ b/drivers/soc/fsl/qbman/qman_test_stash.c
@@ -275,7 +275,8 @@ static inline int process_frame_data(struct hp_handler *handler,
 
 static enum qman_cb_dqrr_result normal_dqrr(struct qman_portal *portal,
 					    struct qman_fq *fq,
-					    const struct qm_dqrr_entry *dqrr)
+					    const struct qm_dqrr_entry *dqrr,
+					    bool napi)
 {
 	struct hp_handler *handler = (struct hp_handler *)fq;
 
@@ -293,7 +294,8 @@ static enum qman_cb_dqrr_result normal_dqrr(struct qman_portal *portal,
 
 static enum qman_cb_dqrr_result special_dqrr(struct qman_portal *portal,
 					     struct qman_fq *fq,
-					     const struct qm_dqrr_entry *dqrr)
+					     const struct qm_dqrr_entry *dqrr,
+					     bool napi)
 {
 	struct hp_handler *handler = (struct hp_handler *)fq;
 
diff --git a/include/soc/fsl/qman.h b/include/soc/fsl/qman.h
index 9f484113cfda7..fe3faa2d64f16 100644
--- a/include/soc/fsl/qman.h
+++ b/include/soc/fsl/qman.h
@@ -689,7 +689,8 @@ enum qman_cb_dqrr_result {
 };
 typedef enum qman_cb_dqrr_result (*qman_cb_dqrr)(struct qman_portal *qm,
 					struct qman_fq *fq,
-					const struct qm_dqrr_entry *dqrr);
+					const struct qm_dqrr_entry *dqrr,
+					bool napi);
 
 /*
  * This callback type is used when handling ERNs, FQRNs and FQRLs via MR. They
-- 
2.28.0

[PATCH net-next 14/15] net: dpaa: Replace in_irq() usage.

[Sebastian Andrzej Siewior]

The driver uses in_irq() + in_serving_softirq() magic to decide if NAPI
scheduling is required or packet processing.

The usage of in_*() in drivers is phased out and Linus clearly requested
that code which changes behaviour depending on context should either be
seperated or the context be conveyed in an argument passed by the caller,
which usually knows the context.

Use the `napi' argument passed by the callback. It is set true if
called from the interrupt handler and NAPI should be scheduled.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: "Horia Geantă" <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Madalin Bucur <madalin.bucur@nxp.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Li Yang <leoyang.li@nxp.com>
Cc: linux-crypto@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
index 27835310b718e..2c949acd74c67 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
@@ -2300,9 +2300,9 @@ static void dpaa_tx_conf(struct net_device *net_dev,
 }
 
 static inline int dpaa_eth_napi_schedule(struct dpaa_percpu_priv *percpu_priv,
-					 struct qman_portal *portal)
+					 struct qman_portal *portal, bool napi)
 {
-	if (unlikely(in_irq() || !in_serving_softirq())) {
+	if (napi) {
 		/* Disable QMan IRQ and invoke NAPI */
 		qman_p_irqsource_remove(portal, QM_PIRQ_DQRI);
 
@@ -2333,7 +2333,7 @@ static enum qman_cb_dqrr_result rx_error_dqrr(struct qman_portal *portal,
 
 	percpu_priv = this_cpu_ptr(priv->percpu_priv);
 
-	if (dpaa_eth_napi_schedule(percpu_priv, portal))
+	if (dpaa_eth_napi_schedule(percpu_priv, portal, napi))
 		return qman_cb_dqrr_stop;
 
 	dpaa_eth_refill_bpools(priv);
@@ -2377,7 +2377,7 @@ static enum qman_cb_dqrr_result rx_default_dqrr(struct qman_portal *portal,
 	percpu_priv = this_cpu_ptr(priv->percpu_priv);
 	percpu_stats = &percpu_priv->stats;
 
-	if (unlikely(dpaa_eth_napi_schedule(percpu_priv, portal)))
+	if (unlikely(dpaa_eth_napi_schedule(percpu_priv, portal, napi)))
 		return qman_cb_dqrr_stop;
 
 	/* Make sure we didn't run out of buffers */
@@ -2474,7 +2474,7 @@ static enum qman_cb_dqrr_result conf_error_dqrr(struct qman_portal *portal,
 
 	percpu_priv = this_cpu_ptr(priv->percpu_priv);
 
-	if (dpaa_eth_napi_schedule(percpu_priv, portal))
+	if (dpaa_eth_napi_schedule(percpu_priv, portal, napi))
 		return qman_cb_dqrr_stop;
 
 	dpaa_tx_error(net_dev, priv, percpu_priv, &dq->fd, fq->fqid);
@@ -2499,7 +2499,7 @@ static enum qman_cb_dqrr_result conf_dflt_dqrr(struct qman_portal *portal,
 
 	percpu_priv = this_cpu_ptr(priv->percpu_priv);
 
-	if (dpaa_eth_napi_schedule(percpu_priv, portal))
+	if (dpaa_eth_napi_schedule(percpu_priv, portal, napi))
 		return qman_cb_dqrr_stop;
 
 	dpaa_tx_conf(net_dev, priv, percpu_priv, &dq->fd, fq->fqid);
-- 
2.28.0

Re: [PATCH net-next 14/15] net: dpaa: Replace in_irq() usage.

[Jakub Kicinski]

On Tue, 27 Oct 2020 23:54:53 +0100 Sebastian Andrzej Siewior wrote:
> The driver uses in_irq() + in_serving_softirq() magic to decide if NAPI
> scheduling is required or packet processing.
> 
> The usage of in_*() in drivers is phased out and Linus clearly requested
> that code which changes behaviour depending on context should either be
> seperated or the context be conveyed in an argument passed by the caller,
> which usually knows the context.
> 
> Use the `napi' argument passed by the callback. It is set true if
> called from the interrupt handler and NAPI should be scheduled.
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Cc: "Horia Geantă" <horia.geanta@nxp.com>
> Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Madalin Bucur <madalin.bucur@nxp.com>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: Li Yang <leoyang.li@nxp.com>
> Cc: linux-crypto@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-arm-kernel@lists.infradead.org
> ---
>  drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> index 27835310b718e..2c949acd74c67 100644
> --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> @@ -2300,9 +2300,9 @@ static void dpaa_tx_conf(struct net_device *net_dev,
>  }
>  
>  static inline int dpaa_eth_napi_schedule(struct dpaa_percpu_priv *percpu_priv,
> -					 struct qman_portal *portal)
> +					 struct qman_portal *portal, bool napi)
>  {
> -	if (unlikely(in_irq() || !in_serving_softirq())) {
> +	if (napi) {
>  		/* Disable QMan IRQ and invoke NAPI */
>  		qman_p_irqsource_remove(portal, QM_PIRQ_DQRI);
>  

Nit: some networking drivers have a bool napi which means "are we
running in napi context", the semantics here feel a little backwards,
at least to me. But if I'm the only one thinking this, so be it.

Re: [PATCH net-next 14/15] net: dpaa: Replace in_irq() usage.

[Sebastian Andrzej Siewior]

On 2020-10-31 10:12:15 [-0700], Jakub Kicinski wrote:
> Nit: some networking drivers have a bool napi which means "are we
> running in napi context", the semantics here feel a little backwards,
> at least to me. But if I'm the only one thinking this, so be it.

I renamed it to `sched_napi'.

Sebastian

[PATCH net-next 15/15] crypto: caam: Replace in_irq() usage.

[Sebastian Andrzej Siewior]

The driver uses in_irq() + in_serving_softirq() magic to decide if NAPI
scheduling is required or packet processing.

The usage of in_*() in drivers is phased out and Linus clearly requested
that code which changes behaviour depending on context should either be
seperated or the context be conveyed in an argument passed by the caller,
which usually knows the context.

Use the `napi' argument passed by the callback. It is set true if
called from the interrupt handler and NAPI should be scheduled.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: "Horia Geantă" <horia.geanta@nxp.com>
Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Madalin Bucur <madalin.bucur@nxp.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Li Yang <leoyang.li@nxp.com>
Cc: linux-crypto@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/crypto/caam/qi.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/crypto/caam/qi.c b/drivers/crypto/caam/qi.c
index 09ea398304c8b..79dbd90887f8a 100644
--- a/drivers/crypto/caam/qi.c
+++ b/drivers/crypto/caam/qi.c
@@ -545,14 +545,10 @@ static void cgr_cb(struct qman_portal *qm, struct qman_cgr *cgr, int congested)
 	}
 }
 
-static int caam_qi_napi_schedule(struct qman_portal *p, struct caam_napi *np)
+static int caam_qi_napi_schedule(struct qman_portal *p, struct caam_napi *np,
+				 bool napi)
 {
-	/*
-	 * In case of threaded ISR, for RT kernels in_irq() does not return
-	 * appropriate value, so use in_serving_softirq to distinguish between
-	 * softirq and irq contexts.
-	 */
-	if (unlikely(in_irq() || !in_serving_softirq())) {
+	if (napi) {
 		/* Disable QMan IRQ source and invoke NAPI */
 		qman_p_irqsource_remove(p, QM_PIRQ_DQRI);
 		np->p = p;
@@ -574,7 +570,7 @@ static enum qman_cb_dqrr_result caam_rsp_fq_dqrr_cb(struct qman_portal *p,
 	struct caam_drv_private *priv = dev_get_drvdata(qidev);
 	u32 status;
 
-	if (caam_qi_napi_schedule(p, caam_napi))
+	if (caam_qi_napi_schedule(p, caam_napi, napi))
 		return qman_cb_dqrr_stop;
 
 	fd = &dqrr->fd;
-- 
2.28.0

Re: [PATCH net-next 00/15] in_interrupt() cleanup, part 2

[Jakub Kicinski]

On Tue, 27 Oct 2020 23:54:39 +0100 Sebastian Andrzej Siewior wrote:
> Folks,
> 
> in the discussion about preempt count consistency across kernel configurations:
> 
>   https://lore.kernel.org/r/20200914204209.256266093@linutronix.de/
> 
> Linus clearly requested that code in drivers and libraries which changes
> behaviour based on execution context should either be split up so that
> e.g. task context invocations and BH invocations have different interfaces
> or if that's not possible the context information has to be provided by the
> caller which knows in which context it is executing.
> 
> This includes conditional locking, allocation mode (GFP_*) decisions and
> avoidance of code paths which might sleep.
> 
> In the long run, usage of 'preemptible, in_*irq etc.' should be banned from
> driver code completely.
> 
> This is part two addressing remaining drivers except for orinoco-usb.

Freescale folks - can I get an ack for merging the last three patches
into net-next?

Re: [PATCH net-next 00/15] in_interrupt() cleanup, part 2

[Jakub Kicinski]

On Tue, 27 Oct 2020 23:54:39 +0100 Sebastian Andrzej Siewior wrote:
> Folks,
> 
> in the discussion about preempt count consistency across kernel configurations:
> 
>   https://lore.kernel.org/r/20200914204209.256266093@linutronix.de/
> 
> Linus clearly requested that code in drivers and libraries which changes
> behaviour based on execution context should either be split up so that
> e.g. task context invocations and BH invocations have different interfaces
> or if that's not possible the context information has to be provided by the
> caller which knows in which context it is executing.
> 
> This includes conditional locking, allocation mode (GFP_*) decisions and
> avoidance of code paths which might sleep.
> 
> In the long run, usage of 'preemptible, in_*irq etc.' should be banned from
> driver code completely.
> 
> This is part two addressing remaining drivers except for orinoco-usb.

Sebastian, thanks for there, I picked up only the Ethernet patches:

5ce7f3f46f6b net: neterion: s2io: Replace in_interrupt() for context detection
dc5e8bfcd12e net: forcedeth: Replace context and lock check with a lockdep_assert()
beca92820dc4 net: tlan: Replace in_irq() usage

Please repost the wireless stuff for Kalle to linux-wireless@vger, 
and repost the fsl stuff separately (our patchwork queue is huge, 
I can't keep this waiting for an ack any longer).