linux-kernel - [ 48/53] MD: Add del_timer_sync to mddev

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Message-Id: <20120518023300.840403606@decadent.org.uk>
Date:	Fri, 18 May 2012 03:33:42 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Jonathan Brassow <jbrassow@...hat.com>,
	NeilBrown <neilb@...e.de>
Subject: [ 48/53] MD: Add del_timer_sync to mddev_suspend (fix nasty panic)

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

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

From: Jonathan Brassow <jbrassow@...hat.com>

commit 0d9f4f135eb6dea06bdcb7065b1e4ff78274a5e9 upstream.

Use del_timer_sync to remove timer before mddev_suspend finishes.

We don't want a timer going off after an mddev_suspend is called.  This is
especially true with device-mapper, since it can call the destructor function
immediately following a suspend.  This results in the removal (kfree) of the
structures upon which the timer depends - resulting in a very ugly panic.
Therefore, we add a del_timer_sync to mddev_suspend to prevent this.

Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/md/md.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 477eb2e..01233d8 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -391,6 +391,8 @@ void mddev_suspend(struct mddev *mddev)
 	synchronize_rcu();
 	wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0);
 	mddev->pers->quiesce(mddev, 1);
+
+	del_timer_sync(&mddev->safemode_timer);
 }
 EXPORT_SYMBOL_GPL(mddev_suspend);
 
-- 
1.7.10



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