From: Peter Zijlstra Date: Thu, 3 Feb 2011 14:09:41 +0000 (+0100) Subject: lockdep, timer: Fix del_timer_sync() annotation X-Git-Tag: v2.6.38-rc4~10^2^2 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=f266a5110d453b7987194460ac7edd31f1a5426c;p=~emulex%2Finfiniband.git 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 Signed-off-by: Peter Zijlstra Reviewed-by: Yong Zhang LKML-Reference: <20110203141548.039540914@chello.nl> Signed-off-by: Thomas Gleixner --- diff --git a/kernel/timer.c b/kernel/timer.c index 43ca9936f2d..d53ce66daea 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