Commit 1dd63814 authored Feb 13, 2013 by Tejun Heo

workqueue: fix is_chained_work() regression



c9e7cf27 ("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>

parent 8594fade

kernel/workqueue.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1167,7 +1167,7 @@ static bool is_chained_work(struct workqueue_struct *wq)
		unsigned long flags;
		unsigned int cpu;

		for_each_wq_cpu(cpu) {
		for_each_cwq_cpu(cpu, wq) {
		struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
		struct worker_pool *pool = cwq->pool;
		struct worker *worker;