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workqueue: use irqsafe timer for delayed_work

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Up to now, for delayed_works, try_to_grab_pending() couldn't be used
from IRQ handlers because IRQs may happen while
delayed_work_timer_fn() is in progress leading to indefinite -EAGAIN.

This patch makes delayed_work use the new TIMER_IRQSAFE flag for
delayed_work->timer.  This makes try_to_grab_pending() and thus
mod_delayed_work_on() safe to call from IRQ handlers.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo
2012-08-21 13:18:24 -07:00
parent f991b318cc
commit e0aecdd874
2 changed files with 16 additions and 12 deletions
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8
include/linux/workqueue.h
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@@ -136,7 +136,8 @@ struct execute_work {
#define __DELAYED_WORK_INITIALIZER(n, f, tflags) { \
.work = __WORK_INITIALIZER((n).work, (f)), \
.timer = __TIMER_INITIALIZER(delayed_work_timer_fn, \
0, (unsigned long)&(n), (tflags)), \
0, (unsigned long)&(n), \
(tflags) | TIMER_IRQSAFE), \
}
#define DECLARE_WORK(n, f) \
@@ -214,7 +215,8 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
do { \
INIT_WORK(&(_work)->work, (_func)); \
__setup_timer(&(_work)->timer, delayed_work_timer_fn, \
(unsigned long)(_work), (_tflags)); \
(unsigned long)(_work), \
(_tflags) | TIMER_IRQSAFE); \
} while (0)
#define __INIT_DELAYED_WORK_ONSTACK(_work, _func, _tflags) \
@@ -223,7 +225,7 @@ static inline unsigned int work_static(struct work_struct *work) { return 0; }
__setup_timer_on_stack(&(_work)->timer, \
delayed_work_timer_fn, \
(unsigned long)(_work), \
(_tflags)); \
(_tflags) | TIMER_IRQSAFE); \
} while (0)
#define INIT_DELAYED_WORK(_work, _func) \