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authorRabin Vincent <rabin@rab.in>2012-01-29 13:17:33 -0500
committerWu Fengguang <fengguang.wu@intel.com>2012-02-01 03:52:49 -0500
commit2673b4cf5d59c3ee5e0c12f6d734d38770324dc4 (patch)
treeabef3ab4517f06b629f5dc4c516c135165cf7d81 /include
parent62aa2b537c6f5957afd98e29f96897419ed5ebab (diff)
backing-dev: fix wakeup timer races with bdi_unregister()
While 7a401a972df8e18 ("backing-dev: ensure wakeup_timer is deleted") addressed the problem of the bdi being freed with a queued wakeup timer, there are other races that could happen if the wakeup timer expires after/during bdi_unregister(), before bdi_destroy() is called. wakeup_timer_fn() could attempt to wakeup a task which has already has been freed, or could access a NULL bdi->dev via the wake_forker_thread tracepoint. Cc: <stable@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Reported-by: Chanho Min <chanho.min@lge.com> Reviewed-by: Namjae Jeon <linkinjeon@gmail.com> Signed-off-by: Rabin Vincent <rabin@rab.in> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
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