linux-kernel - [ 011/173] workqueue: convert BUG_ON()s in __queue_delayed_work() to WARN_ON

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Message-Id: <20121228190332.337998711@decadent.org.uk>
Date:	Fri, 28 Dec 2012 20:03:41 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Tejun Heo <tj@...nel.org>, Xiaotian Feng <xtfeng@...il.com>,
	Shuah Khan <shuah.khan@...com>
Subject: [ 011/173] workqueue: convert BUG_ON()s in __queue_delayed_work() to
 WARN_ON_ONCE()s

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tejun Heo <tj@...nel.org>

commit fc4b514f2727f74a4587c31db87e0e93465518c3 upstream.

8852aac25e ("workqueue: mod_delayed_work_on() shouldn't queue timer on
0 delay") unexpectedly uncovered a very nasty abuse of delayed_work in
megaraid - it allocated work_struct, casted it to delayed_work and
then pass that into queue_delayed_work().

Previously, this was okay because 0 @delay short-circuited to
queue_work() before doing anything with delayed_work.  8852aac25e
moved 0 @delay test into __queue_delayed_work() after sanity check on
delayed_work making megaraid trigger BUG_ON().

Although megaraid is already fixed by c1d390d8e6 ("megaraid: fix
BUG_ON() from incorrect use of delayed work"), this patch converts
BUG_ON()s in __queue_delayed_work() to WARN_ON_ONCE()s so that such
abusers, if there are more, trigger warning but don't crash the
machine.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Xiaotian Feng <xtfeng@...il.com>
[Shuah Khan: This change is back-ported from upstream change that
 converted BUG_ON()s in __queue_delayed_work() to WARN_ON_ONCE()s.]
Tested on Stable Trees: 3.0.x, 3.4.x, 3.6.x
Signed-off-by: Shuah Khan <shuah.khan@...com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/workqueue.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1146,8 +1146,8 @@ int queue_delayed_work_on(int cpu, struc
 	if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
 		unsigned int lcpu;

-		BUG_ON(timer_pending(timer));
-		BUG_ON(!list_empty(&work->entry));
+		WARN_ON_ONCE(timer_pending(timer));
+		WARN_ON_ONCE(!list_empty(&work->entry));

 		timer_stats_timer_set_start_info(&dwork->timer);

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