workqueue: fix is_chained_work() regression
authorTejun Heo <tj@kernel.org>
Thu, 14 Feb 2013 03:29:07 +0000 (19:29 -0800)
committerTejun Heo <tj@kernel.org>
Thu, 14 Feb 2013 03:29:07 +0000 (19:29 -0800)
commit1dd638149f1f9d7d7dbb32591d5c7c2a0ea36264
tree454399689b5d5016eefbd9f12e39b2674a8ebb33
parent8594fade39d3ad02ef856b8c53b5d7cc538a55f5
workqueue: fix is_chained_work() regression

c9e7cf273f ("workqueue: move busy_hash from global_cwq to
worker_pool") incorrectly converted is_chained_work() to use
get_gcwq() inside for_each_gcwq_cpu() while removing get_gcwq().

As cwq might not exist for all possible workqueue CPUs, @cwq can be
NULL and the following cwq deferences can lead to oops.

Fix it by using for_each_cwq_cpu() instead, which is the better one to
use anyway as we only need to check pools that the wq is associated
with.

Signed-off-by: Tejun Heo <tj@kernel.org>
kernel/workqueue.c