Merge branch 'for-3.7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

Pull workqueue fixes from Tejun Heo:
 "So, safe fixes my ass.

  Commit 8852aac25e79 ("workqueue: mod_delayed_work_on() shouldn't queue
  timer on 0 delay") had the side-effect of performing delayed_work
  sanity checks even when @delay is 0, which should be fine for any sane
  use cases.

  Unfortunately, megaraid was being overly ingenious.  It seemingly
  wanted to use cancel_delayed_work_sync() before cancel_work_sync() was
  introduced, but didn't want to waste the space for full delayed_work
  as it was only going to use 0 @delay.  So, it only allocated space for
  struct work_struct and then cast it to struct delayed_work and passed
  it into delayed_work functions - truly awesome engineering tradeoff to
  save some bytes.

  Xiaotian fixed it by making megraid allocate full delayed_work for
  now.  It should be converted to use work_struct and cancel_work_sync()
  but I think we better do that after 3.7.

  I added another commit to change BUG_ON()s in __queue_delayed_work()
  to WARN_ON_ONCE()s so that the kernel doesn't crash even if there are
  more such abuses."

* 'for-3.7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
  workqueue: convert BUG_ON()s in __queue_delayed_work() to WARN_ON_ONCE()s
  megaraid: fix BUG_ON() from incorrect use of delayed work

1 files changed, 2 insertions, 2 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 084aa47..1dae900 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1361,8 +1361,8 @@ static void __queue_delayed_work(int cpu, struct workqueue_struct *wq,
 
 	WARN_ON_ONCE(timer->function != delayed_work_timer_fn ||
 		     timer->data != (unsigned long)dwork);
-	BUG_ON(timer_pending(timer));
-	BUG_ON(!list_empty(&work->entry));
+	WARN_ON_ONCE(timer_pending(timer));
+	WARN_ON_ONCE(!list_empty(&work->entry));
 
 	/*
 	 * If @delay is 0, queue @dwork->work immediately.  This is for