diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2007-05-15 01:41:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-15 08:54:00 -0700 |
| commit | 8f89441b37536fea92b1ed7004e5e2dda011473d (patch) | |
| tree | 7587c859ea62fb3905613fc4265a8120b5384516 /kernel | |
| parent | 3c46bdcaec53eda069a8a9cd60621c7431aa7842 (diff) | |
| download | lwn-8f89441b37536fea92b1ed7004e5e2dda011473d.tar.gz lwn-8f89441b37536fea92b1ed7004e5e2dda011473d.zip | |
clocksource: fix lock order in the resume path
lockdep complains about the lock nesting of clocksource and watchdog lock
in the resume path.
Change the resume marker to a bit operation and remove the lock from this
path.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/time/clocksource.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index 3db5c3c460d7..51b6a6a6158c 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -74,7 +74,7 @@ static struct clocksource *watchdog; static struct timer_list watchdog_timer; static DEFINE_SPINLOCK(watchdog_lock); static cycle_t watchdog_last; -static int watchdog_resumed; +static unsigned long watchdog_resumed; /* * Interval: 0.5sec Threshold: 0.0625s @@ -104,9 +104,7 @@ static void clocksource_watchdog(unsigned long data) spin_lock(&watchdog_lock); - resumed = watchdog_resumed; - if (unlikely(resumed)) - watchdog_resumed = 0; + resumed = test_and_clear_bit(0, &watchdog_resumed); wdnow = watchdog->read(); wd_nsec = cyc2ns(watchdog, (wdnow - watchdog_last) & watchdog->mask); @@ -151,9 +149,7 @@ static void clocksource_watchdog(unsigned long data) } static void clocksource_resume_watchdog(void) { - spin_lock(&watchdog_lock); - watchdog_resumed = 1; - spin_unlock(&watchdog_lock); + set_bit(0, &watchdog_resumed); } static void clocksource_check_watchdog(struct clocksource *cs) |