From 1a06c911c0d31cf6a1c3e61e2bdf163b123d4608 Mon Sep 17 00:00:00 2001
From: Sedat Dilek <sedat.dilek@gmail.com>
Date: Mon, 14 Sep 2015 14:44:55 +0200
Subject: [PATCH] workqueue: Add might_sleep() on the top of
 __cancel_work_timer()

For more details see [1].

[1] http://marc.info/?t=144179442100006&r=1&w=2

Suggested-by: Lai Jiangshan <jiangshanlai@gmail.com>
CC: Tejun Heo <tj@kernel.org>
---
 kernel/workqueue.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 4c4f06176f74..adf2a0c33341 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2768,6 +2768,8 @@ static bool __cancel_work_timer(struct work_struct *work, bool is_dwork)
 	unsigned long flags;
 	int ret;
 
+	might_sleep();
+
 	do {
 		ret = try_to_grab_pending(work, is_dwork, &flags);
 		/*
-- 
2.5.2