diff options
| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2008-08-21 01:09:11 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-08-21 02:40:31 +0400 |
| commit | 1d96469a34781340b2cc9bdf97d5913eecdaa038 (patch) | |
| tree | a1ffd32c3119714a1a4e242417f9b3f8e9388930 | |
| parent | ff9bc512f198eb47204f55b24c6fe3d36ed89592 (diff) | |
| download | linux-1d96469a34781340b2cc9bdf97d5913eecdaa038.tar.xz | |
rtc: fix double lock on UIE emulation
With commit 5ad31a575157147b43fa84ef1e21471661653878 ("rtc: remove BKL
for ioctl()"), RTC_UIE_ON ioctl cause double lock on rtc->ops_lock.
The ops_lock must not be held while set_uie() calls rtc_read_time()
which takes the lock. Also clear_uie() does not need ops_lock. This
patch fixes return value of RTC_UIE_OFF ioctl too.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: David Brownell <david-b@pacbell.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/rtc/rtc-dev.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c index 35dcc06eb3e2..f118252f3a9f 100644 --- a/drivers/rtc/rtc-dev.c +++ b/drivers/rtc/rtc-dev.c @@ -403,11 +403,14 @@ static long rtc_dev_ioctl(struct file *file, #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL case RTC_UIE_OFF: + mutex_unlock(&rtc->ops_lock); clear_uie(rtc); - break; + return 0; case RTC_UIE_ON: + mutex_unlock(&rtc->ops_lock); err = set_uie(rtc); + return err; #endif default: err = -ENOTTY; |