[GIT PULL] workqueue changes for v4.11-rc2

[Tejun Heo]

Hello,

* If a delayed work is queued with NULL @wq, workqueue code explodes
  after the timer expires at which point it's difficult to tell who
  the culprit was.  This actually happened and the offender was
  net/smc this time.  Add an explicit sanity check for it in the
  queueing path.

Thanks.

The following changes since commit c1ae3cfa0e89fa1a7ecc4c99031f5e9ae99d9201:

  Linux 4.11-rc1 (2017-03-05 12:59:56 -0800)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-4.11-fixes

for you to fetch changes up to 637fdbae60d6cb9f6e963c1079d7e0445c86ff7d:

  workqueue: trigger WARN if queue_delayed_work() is called with NULL @wq (2017-03-06 15:33:42 -0500)

----------------------------------------------------------------
Tejun Heo (1):
      workqueue: trigger WARN if queue_delayed_work() is called with NULL @wq

 kernel/workqueue.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 072cbc9..c0168b7 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1507,6 +1507,7 @@ static void __queue_delayed_work(int cpu, struct workqueue_struct *wq,
 	struct timer_list *timer = &dwork->timer;
 	struct work_struct *work = &dwork->work;
 
+	WARN_ON_ONCE(!wq);
 	WARN_ON_ONCE(timer->function != delayed_work_timer_fn ||
 		     timer->data != (unsigned long)dwork);
 	WARN_ON_ONCE(timer_pending(timer));

-- 
tejun