From: Arnd Bergmann <arnd@arndb.de>
To: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
Arnd Bergmann <arnd@arndb.de>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Alessandro Zummo <a.zummo@towertech.it>,
linux-rtc@vger.kernel.org
Subject: [PATCH v5 11/29] compat_ioctl: move rtc handling into rtc-dev.c
Date: Tue, 30 Jul 2019 21:25:22 +0200 [thread overview]
Message-ID: <20190730192552.4014288-12-arnd@arndb.de> (raw)
In-Reply-To: <20190730192552.4014288-1-arnd@arndb.de>
We no longer need the rtc compat handling to be in common code, now that
all drivers are either moved to the rtc-class framework, or (rarely)
exist in drivers/char for architectures without compat mode (m68k,
alpha and ia64, respectively).
I checked the list of ioctl commands in drivers, and the ones that are
not already handled are all compatible, again with the one exception of
m68k driver, which implements RTC_PLL_GET and RTC_PLL_SET, but has no
compat mode.
Since the ioctl commands are either compatible or differ in both structure
and command code between 32-bit and 64-bit, we can merge the compat
handler into the native one and just implement the two common compat
commands (RTC_IRQP_READ, RTC_IRQP_SET) there. The result is a slight
change in behavior, as a native 64-bit process will now also handle the
32-bit commands (RTC_IRQP_SET32/RTC_IRQP_SET).
The old conversion handler also deals with RTC_EPOCH_READ and
RTC_EPOCH_SET, which are not handled in rtc-dev.c but only in a single
device driver (rtc-vr41xx), so I'm adding the compat version in the same
place. I don't expect other drivers to need those commands in the future.
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v2: merge compat handler into ioctl function to avoid the
compat_alloc_user_space() roundtrip, based on feedback
from Al Viro.
---
drivers/rtc/dev.c | 13 +++++++++-
drivers/rtc/rtc-vr41xx.c | 10 ++++++++
fs/compat_ioctl.c | 53 ----------------------------------------
3 files changed, 22 insertions(+), 54 deletions(-)
diff --git a/drivers/rtc/dev.c b/drivers/rtc/dev.c
index 84feb2565abd..1dc5063f78c9 100644
--- a/drivers/rtc/dev.c
+++ b/drivers/rtc/dev.c
@@ -10,6 +10,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/compat.h>
#include <linux/module.h>
#include <linux/rtc.h>
#include <linux/sched/signal.h>
@@ -357,10 +358,19 @@ static long rtc_dev_ioctl(struct file *file,
mutex_unlock(&rtc->ops_lock);
return rtc_update_irq_enable(rtc, 0);
+#ifdef CONFIG_64BIT
+#define RTC_IRQP_SET32 _IOW('p', 0x0c, __u32)
+#define RTC_IRQP_READ32 _IOR('p', 0x0b, __u32)
+ case RTC_IRQP_SET32:
+ err = rtc_irq_set_freq(rtc, arg);
+ break;
+ case RTC_IRQP_READ32:
+ err = put_user(rtc->irq_freq, (unsigned int __user *)uarg);
+ break;
+#endif
case RTC_IRQP_SET:
err = rtc_irq_set_freq(rtc, arg);
break;
-
case RTC_IRQP_READ:
err = put_user(rtc->irq_freq, (unsigned long __user *)uarg);
break;
@@ -434,6 +444,7 @@ static const struct file_operations rtc_dev_fops = {
.read = rtc_dev_read,
.poll = rtc_dev_poll,
.unlocked_ioctl = rtc_dev_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
.open = rtc_dev_open,
.release = rtc_dev_release,
.fasync = rtc_dev_fasync,
diff --git a/drivers/rtc/rtc-vr41xx.c b/drivers/rtc/rtc-vr41xx.c
index c75230562c0d..79f27de545af 100644
--- a/drivers/rtc/rtc-vr41xx.c
+++ b/drivers/rtc/rtc-vr41xx.c
@@ -4,6 +4,7 @@
*
* Copyright (C) 2003-2008 Yoichi Yuasa <yuasa@linux-mips.org>
*/
+#include <linux/compat.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/init.h>
@@ -66,6 +67,10 @@ static void __iomem *rtc2_base;
#define rtc2_read(offset) readw(rtc2_base + (offset))
#define rtc2_write(offset, value) writew((value), rtc2_base + (offset))
+/* 32-bit compat for ioctls that nobody else uses */
+#define RTC_EPOCH_READ32 _IOR('p', 0x0d, __u32)
+#define RTC_EPOCH_SET32 _IOW('p', 0x0e, __u32)
+
static unsigned long epoch = 1970; /* Jan 1 1970 00:00:00 */
static DEFINE_SPINLOCK(rtc_lock);
@@ -179,6 +184,11 @@ static int vr41xx_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long
switch (cmd) {
case RTC_EPOCH_READ:
return put_user(epoch, (unsigned long __user *)arg);
+#ifdef CONFIG_64BIT
+ case RTC_EPOCH_READ32:
+ return put_user(epoch, (unsigned int __user *)arg);
+ case RTC_EPOCH_SET32:
+#endif
case RTC_EPOCH_SET:
/* Doesn't support before 1900 */
if (arg < 1900)
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index cec3ec0a1727..47da220f95b1 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -32,7 +32,6 @@
#include <linux/vt_kern.h>
#include <linux/raw.h>
#include <linux/blkdev.h>
-#include <linux/rtc.h>
#include <linux/pci.h>
#include <linux/serial.h>
#include <linux/ctype.h>
@@ -436,37 +435,6 @@ static int mt_ioctl_trans(struct file *file,
#define HCIUARTSETFLAGS _IOW('U', 203, int)
#define HCIUARTGETFLAGS _IOR('U', 204, int)
-#define RTC_IRQP_READ32 _IOR('p', 0x0b, compat_ulong_t)
-#define RTC_IRQP_SET32 _IOW('p', 0x0c, compat_ulong_t)
-#define RTC_EPOCH_READ32 _IOR('p', 0x0d, compat_ulong_t)
-#define RTC_EPOCH_SET32 _IOW('p', 0x0e, compat_ulong_t)
-
-static int rtc_ioctl(struct file *file,
- unsigned cmd, void __user *argp)
-{
- unsigned long __user *valp = compat_alloc_user_space(sizeof(*valp));
- int ret;
-
- if (valp == NULL)
- return -EFAULT;
- switch (cmd) {
- case RTC_IRQP_READ32:
- case RTC_EPOCH_READ32:
- ret = do_ioctl(file, (cmd == RTC_IRQP_READ32) ?
- RTC_IRQP_READ : RTC_EPOCH_READ,
- (unsigned long)valp);
- if (ret)
- return ret;
- return convert_in_user(valp, (unsigned int __user *)argp);
- case RTC_IRQP_SET32:
- return do_ioctl(file, RTC_IRQP_SET, (unsigned long)argp);
- case RTC_EPOCH_SET32:
- return do_ioctl(file, RTC_EPOCH_SET, (unsigned long)argp);
- }
-
- return -ENOIOCTLCMD;
-}
-
/*
* simple reversible transform to make our table more evenly
* distributed after sorting.
@@ -503,21 +471,6 @@ COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI)
/* Big V (don't complain on serial console) */
IGNORE_IOCTL(VT_OPENQRY)
IGNORE_IOCTL(VT_GETMODE)
-/* Little p (/dev/rtc, /dev/envctrl, etc.) */
-COMPATIBLE_IOCTL(RTC_AIE_ON)
-COMPATIBLE_IOCTL(RTC_AIE_OFF)
-COMPATIBLE_IOCTL(RTC_UIE_ON)
-COMPATIBLE_IOCTL(RTC_UIE_OFF)
-COMPATIBLE_IOCTL(RTC_PIE_ON)
-COMPATIBLE_IOCTL(RTC_PIE_OFF)
-COMPATIBLE_IOCTL(RTC_WIE_ON)
-COMPATIBLE_IOCTL(RTC_WIE_OFF)
-COMPATIBLE_IOCTL(RTC_ALM_SET)
-COMPATIBLE_IOCTL(RTC_ALM_READ)
-COMPATIBLE_IOCTL(RTC_RD_TIME)
-COMPATIBLE_IOCTL(RTC_SET_TIME)
-COMPATIBLE_IOCTL(RTC_WKALM_SET)
-COMPATIBLE_IOCTL(RTC_WKALM_RD)
/*
* These two are only for the sbus rtc driver, but
* hwclock tries them on every rtc device first when
@@ -897,12 +850,6 @@ static long do_ioctl_trans(unsigned int cmd,
case MTIOCPOS32:
return mt_ioctl_trans(file, cmd, argp);
#endif
- /* Not implemented in the native kernel */
- case RTC_IRQP_READ32:
- case RTC_IRQP_SET32:
- case RTC_EPOCH_READ32:
- case RTC_EPOCH_SET32:
- return rtc_ioctl(file, cmd, argp);
}
/*
--
2.20.0
next prev parent reply other threads:[~2019-07-30 19:30 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-30 19:25 [PATCH v5 00/29] compat_ioctl.c removal, part 1/3 Arnd Bergmann
2019-07-30 19:25 ` [PATCH v5 01/29] fix compat handling of FICLONERANGE, FIDEDUPERANGE and FS_IOC_FIEMAP Arnd Bergmann
2019-07-30 19:25 ` [PATCH v5 02/29] FIGETBSZ: fix compat Arnd Bergmann
2019-07-30 19:25 ` [PATCH v5 03/29] compat: itanic doesn't have one Arnd Bergmann
2019-07-30 19:25 ` [PATCH v5 04/29] do_vfs_ioctl(): use saner types Arnd Bergmann
2019-07-30 19:25 ` [PATCH v5 05/29] compat: move FS_IOC_RESVSP_32 handling to fs/ioctl.c Arnd Bergmann
2019-07-30 19:25 ` [PATCH v5 06/29] compat_sys_ioctl(): make parallel to do_vfs_ioctl() Arnd Bergmann
2019-07-30 19:25 ` [PATCH v5 07/29] ceph: fix compat_ioctl for ceph_dir_operations Arnd Bergmann
2019-07-30 19:25 ` [PATCH v5 08/29] compat_ioctl: drop FIOQSIZE table entry Arnd Bergmann
2019-07-30 19:25 ` [PATCH v5 09/29] compat_ioctl: pppoe: fix PPPOEIOCSFWD handling Arnd Bergmann
2019-07-30 21:42 ` David Miller
2019-07-30 19:25 ` [PATCH v5 10/29] compat_ioctl: add compat_ptr_ioctl() Arnd Bergmann
2019-07-30 19:25 ` Arnd Bergmann [this message]
2019-07-30 19:50 ` [PATCH v5 12/29] compat_ioctl: move drivers to compat_ptr_ioctl Arnd Bergmann
2019-07-30 21:43 ` David Miller
2019-07-31 8:37 ` Cornelia Huck
2019-07-30 19:55 ` [PATCH v5 13/29] compat_ioctl: move more " Arnd Bergmann
2019-07-30 19:55 ` [PATCH v5 14/29] compat_ioctl: use correct compat_ptr() translation in drivers Arnd Bergmann
2019-07-30 19:55 ` [PATCH v5 15/29] compat_ioctl: move tape handling into drivers Arnd Bergmann
2019-07-31 10:50 ` Heiko Carstens
2019-07-31 15:47 ` Arnd Bergmann
2019-07-30 19:55 ` [PATCH v5 16/29] compat_ioctl: move ATYFB_CLK handling to atyfb driver Arnd Bergmann
2019-07-30 19:55 ` [PATCH v5 17/29] compat_ioctl: move isdn/capi ioctl translation into driver Arnd Bergmann
2019-07-30 19:55 ` [PATCH v5 18/29] compat_ioctl: move rfcomm handlers " Arnd Bergmann
2019-08-12 16:29 ` Marcel Holtmann
2019-07-30 19:55 ` [PATCH v5 19/29] compat_ioctl: move hci_sock " Arnd Bergmann
2019-08-12 16:29 ` Marcel Holtmann
2019-07-30 20:14 ` [PATCH v5 13/29] compat_ioctl: move more drivers to compat_ptr_ioctl Dan Williams
2019-07-30 20:01 ` [PATCH v5 20/29] compat_ioctl: remove HCIUART handling Arnd Bergmann
2019-07-30 20:01 ` [PATCH v5 21/29] compat_ioctl: remove HIDIO translation Arnd Bergmann
2019-07-30 20:01 ` [PATCH v5 22/29] compat_ioctl: remove translation for sound ioctls Arnd Bergmann
2019-07-30 20:01 ` [PATCH v5 23/29] compat_ioctl: remove IGNORE_IOCTL() Arnd Bergmann
2019-07-30 20:01 ` [PATCH v5 24/29] compat_ioctl: remove /dev/random commands Arnd Bergmann
2019-07-30 20:01 ` [PATCH v5 25/29] compat_ioctl: remove joystick ioctl translation Arnd Bergmann
2019-07-30 20:01 ` [PATCH v5 26/29] compat_ioctl: remove PCI " Arnd Bergmann
2019-07-30 20:01 ` [PATCH v5 27/29] compat_ioctl: remove /dev/raw " Arnd Bergmann
2019-07-30 20:01 ` [PATCH v5 28/29] compat_ioctl: remove last RAID handling code Arnd Bergmann
2019-07-30 20:01 ` [PATCH v5 29/29] compat_ioctl: remove unused convert_in_user macro Arnd Bergmann
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