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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>
This commit is contained in:
Tejun Heo 2012-12-04 07:40:39 -08:00 committed by Greg Kroah-Hartman
parent a11bf0aa14
commit 4afca924c0
1 changed files with 2 additions and 2 deletions
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4
kernel/workqueue.c
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@ -1141,8 +1141,8 @@ 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);