From 1dd638149f1f9d7d7dbb32591d5c7c2a0ea36264 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Wed, 13 Feb 2013 19:29:07 -0800
Subject: [PATCH] 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>
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