Tejun Heo 57b30ae77b
workqueue: reimplement cancel_delayed_work() using try_to_grab_pending() ...
cancel_delayed_work() can't be called from IRQ handlers due to its use
of del_timer_sync() and can't cancel work items which are already
transferred from timer to worklist.
Also, unlike other flush and cancel functions, a canceled delayed_work
would still point to the last associated cpu_workqueue. If the
workqueue is destroyed afterwards and the work item is re-used on a
different workqueue, the queueing code can oops trying to dereference
already freed cpu_workqueue.
This patch reimplements cancel_delayed_work() using
try_to_grab_pending() and set_work_cpu_and_clear_pending(). This
allows the function to be called from IRQ handlers and makes its
behavior consistent with other flush / cancel functions.
Signed-off-by: Tejun Heo <tj@kernel.org >
Cc: Linus Torvalds <torvalds@linux-foundation.org >
Cc: Ingo Molnar <mingo@redhat.com >
Cc: Andrew Morton <akpm@linux-foundation.org >
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57b30ae77b