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authorTejun Heo <tj@kernel.org>2012-08-21 20:18:24 (GMT)
committerTejun Heo <tj@kernel.org>2012-08-21 20:18:24 (GMT)
commit57b30ae77bf00d2318df711ef9a4d2a9be0a3a2a (patch)
treed6e084bf0e2b82bb39302ee0e94e6f3f04762dbc /drivers/infiniband/core
parente7c2f967445dd2041f0f8e3179cca22bb8bb7f79 (diff)
downloadlinux-fsl-qoriq-57b30ae77bf00d2318df711ef9a4d2a9be0a3a2a.tar.xz
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>
Diffstat (limited to 'drivers/infiniband/core')
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