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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2008-08-20 14:09:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-20 15:40:31 -0700
commit1d96469a34781340b2cc9bdf97d5913eecdaa038 (patch)
treea1ffd32c3119714a1a4e242417f9b3f8e9388930
parentff9bc512f198eb47204f55b24c6fe3d36ed89592 (diff)
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.c5
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;

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