diff options
| author | Tejun Heo <tj@kernel.org> | 2012-12-04 07:40:39 -0800 |
|---|---|---|
| committer | Jason Liu <r64343@freescale.com> | 2013-11-22 10:54:44 +0800 |
| commit | ce7e0e7b6be6b749041ae81a7bd9ecc23b78ca18 (patch) | |
| tree | 598fd7a2c8b038ca9d52a2687ba36cef130b7a2e | |
| parent | 087544a6e322c247b1f5be3dd873e7c5b1ef3723 (diff) | |
workqueue: convert BUG_ON()s in __queue_delayed_work() to WARN_ON_ONCE()s
commit fc4b514f2727f74a4587c31db87e0e93465518c3 upstream.
8852aac25e ("workqueue: mod_delayed_work_on() shouldn't queue timer on
0 delay") unexpectedly uncovered a very nasty abuse of delayed_work in
megaraid - it allocated work_struct, casted it to delayed_work and
then pass that into queue_delayed_work().
Previously, this was okay because 0 @delay short-circuited to
queue_work() before doing anything with delayed_work. 8852aac25e
moved 0 @delay test into __queue_delayed_work() after sanity check on
delayed_work making megaraid trigger BUG_ON().
Although megaraid is already fixed by c1d390d8e6 ("megaraid: fix
BUG_ON() from incorrect use of delayed work"), this patch converts
BUG_ON()s in __queue_delayed_work() to WARN_ON_ONCE()s so that such
abusers, if there are more, trigger warning but don't crash the
machine.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Xiaotian Feng <xtfeng@gmail.com>
Signed-off-by: Shuah Khan <shuah.khan@hp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 3ff0aeceb49aca3f99c37189e949bf43bfd393a0)
(cherry picked from commit 5721c2db080cd0f9f7370a5eee6704ea71a5c7a4)
| -rw-r--r-- | kernel/workqueue.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index ee1845b8d690..877055bc452f 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1145,8 +1145,8 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq, if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) { unsigned int lcpu; - BUG_ON(timer_pending(timer)); - BUG_ON(!list_empty(&work->entry)); + WARN_ON_ONCE(timer_pending(timer)); + WARN_ON_ONCE(!list_empty(&work->entry)); timer_stats_timer_set_start_info(&dwork->timer); |