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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-02-03 15:09:41 +0100
committerThomas Gleixner <tglx@linutronix.de>2011-02-04 10:31:22 +0100
commitf266a5110d453b7987194460ac7edd31f1a5426c (patch)
treec616ed6d9f59c94e6c16116c8d656dd9862f353f /kernel
parent831d52bc153971b70e64eccfbed2b232394f22f8 (diff)
downloadlinux-linaro-stable-f266a5110d453b7987194460ac7edd31f1a5426c.tar.gz
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')
-rw-r--r--kernel/timer.c6
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