linux-kernel - [PATCH] workqueue: cancel_delayed_work() should return %NULL if work item is idle

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Date:	Thu, 18 Oct 2012 16:39:28 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	linux-kernel@...r.kernel.org, Konrad Wilk <konrad.wilk@...cle.com>
Subject: [PATCH] workqueue: cancel_delayed_work() should return %NULL if
 work item is idle

>From e65120fcfc1cb9697655d29ecd7982451c05d3c2 Mon Sep 17 00:00:00 2001
From: Dan Magenheimer <dan.magenheimer@...cle.com>
Date: Thu, 18 Oct 2012 16:31:37 -0700

57b30ae77b ("workqueue: reimplement cancel_delayed_work() using
try_to_grab_pending()") made cancel_delayed_work() always return %true
unless someone else is also trying to cancel the work item, which is
broken - if the target work item is idle, the return value should be
%false.

try_to_grab_pending() indicates that the target work item was idle by
zero return value.  Use it for return.  Note that this brings
cancel_delayed_work() in line with __cancel_work_timer() in return
value handling.

Signed-off-by: Dan Magenheimer <dan.magenheimer@...cle.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
LKML-Reference: <444a6439-b1a4-4740-9e7e-bc37267cfe73@...ault>
---
 kernel/workqueue.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index d951daa..042d221 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -2982,7 +2982,7 @@ bool cancel_delayed_work(struct delayed_work *dwork)
 
 	set_work_cpu_and_clear_pending(&dwork->work, work_cpu(&dwork->work));
 	local_irq_restore(flags);
-	return true;
+	return ret;
 }
 EXPORT_SYMBOL(cancel_delayed_work);
 
-- 
1.7.7.3

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