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| author | Jiri Kosina <jkosina@suse.cz> | 2007-11-28 16:22:03 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-11-29 09:24:54 -0800 |
| commit | 8853c202b4a91713dbfb4d9b6e1c87cc2aa12392 (patch) | |
| tree | a6c9621d3067eebc17c2ce53fa45e7513ee832a6 /drivers/rtc/interface.c | |
| parent | 08b633070ad5fa17a837428a601c32cf3db6aafd (diff) | |
| download | linux-8853c202b4a91713dbfb4d9b6e1c87cc2aa12392.tar.gz linux-8853c202b4a91713dbfb4d9b6e1c87cc2aa12392.tar.bz2 linux-8853c202b4a91713dbfb4d9b6e1c87cc2aa12392.zip | |
RTC: convert mutex to bitfield
RTC code is using mutex to assure exclusive access to /dev/rtc. This is
however wrong usage, as it leaves the mutex locked when returning into
userspace, which is unacceptable.
Convert rtc->char_lock into bit operation.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc/interface.c')
| -rw-r--r-- | drivers/rtc/interface.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index de0da545c7a1..a4f56e95cf96 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -293,7 +293,7 @@ int rtc_irq_register(struct rtc_device *rtc, struct rtc_task *task) return -EINVAL; /* Cannot register while the char dev is in use */ - if (!(mutex_trylock(&rtc->char_lock))) + if (test_and_set_bit(RTC_DEV_BUSY, &rtc->flags)) return -EBUSY; spin_lock_irq(&rtc->irq_task_lock); @@ -303,7 +303,7 @@ int rtc_irq_register(struct rtc_device *rtc, struct rtc_task *task) } spin_unlock_irq(&rtc->irq_task_lock); - mutex_unlock(&rtc->char_lock); + clear_bit(RTC_DEV_BUSY, &rtc->flags); return retval; } |