Hi,
If you ever have to resend, the file is now named rtc/dev.c so you could adjust the subject.
On 09/10/2019 21:10:10+0200, Arnd Bergmann wrote:
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