linux-kernel - [PATCH 3.12 145/212] raid5: Use slow_path to release stripe when mddev->thread is null

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Message-Id: <20131202191303.386631971@linuxfoundation.org>
Date:	Mon,  2 Dec 2013 11:15:36 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jianpeng Ma <majianpeng@...il.com>,
	NeilBrown <neilb@...e.de>
Subject: [PATCH 3.12 145/212] raid5: Use slow_path to release stripe when mddev->thread is null

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

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

From: majianpeng <majianpeng@...il.com>

commit ad4068de49862b083ac2a15bc50689bb30ce3e44 upstream.

When release_stripe() is called in grow_one_stripe(), the
mddev->thread is null. So it will omit one wakeup this thread to
release stripe.
For this condition, use slow_path to release stripe.

Bug was introduced in 3.12

Fixes: 773ca82fa1ee58dd1bf88b
Signed-off-by: Jianpeng Ma <majianpeng@...il.com>
Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/raid5.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -340,7 +340,8 @@ static void release_stripe(struct stripe
 	unsigned long flags;
 	bool wakeup;
 
-	if (test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state))
+	if (unlikely(!conf->mddev->thread) ||
+		test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state))
 		goto slow_path;
 	wakeup = llist_add(&sh->release_list, &conf->released_stripes);
 	if (wakeup)


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