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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-02-03 15:09:41 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-02-04 10:31:22 +0100 |
| commit | f266a5110d453b7987194460ac7edd31f1a5426c (patch) | |
| tree | c616ed6d9f59c94e6c16116c8d656dd9862f353f /kernel/timer.c | |
| parent | 831d52bc153971b70e64eccfbed2b232394f22f8 (diff) | |
| download | lwn-f266a5110d453b7987194460ac7edd31f1a5426c.tar.gz lwn-f266a5110d453b7987194460ac7edd31f1a5426c.zip | |
lockdep, timer: Fix del_timer_sync() annotation
Calling local_bh_enable() will want to actually start processing
softirqs, which isn't a good idea since this can get called with IRQs
disabled.
Cure this by using _local_bh_enable() which doesn't start processing
softirqs, and use raw_local_irq_save() to avoid any softirqs from
happening without letting lockdep think IRQs are in fact disabled.
Reported-by: Nick Bowler <nbowler@elliptictech.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Yong Zhang <yong.zhang0@gmail.com>
LKML-Reference: <20110203141548.039540914@chello.nl>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/timer.c')
| -rw-r--r-- | kernel/timer.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/timer.c b/kernel/timer.c index 43ca9936f2d0..d53ce66daea0 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -969,10 +969,14 @@ EXPORT_SYMBOL(try_to_del_timer_sync); int del_timer_sync(struct timer_list *timer) { #ifdef CONFIG_LOCKDEP + unsigned long flags; + + raw_local_irq_save(flags); local_bh_disable(); lock_map_acquire(&timer->lockdep_map); lock_map_release(&timer->lockdep_map); - local_bh_enable(); + _local_bh_enable(); + raw_local_irq_restore(flags); #endif /* * don't use it in hardirq context, because it |