The patch below does not apply to the 4.5-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 092398dce8c2406bfb0c9eebc3e764ff2ddb62a8 Mon Sep 17 00:00:00 2001
From: Heinz Mauelshagen <heinzm@xxxxxxxxxx>
Date: Tue, 3 May 2016 19:43:57 +0200
Subject: [PATCH] md: md.c: fix oops in mddev_suspend for raid0
Introduced by upstream commit 70d9798b95562abac005d4ba71d28820f9a201eb
The raid0 personality does not create mddev->thread as oposed to
other personalities leading to its unconditional access in
mddev_suspend() causing an oops.
Patch checks for mddev->thread in order to keep the
intention of aforementioned commit.
Fixes: 70d9798b9556 ("MD: warn for potential deadlock")
Cc: stable@xxxxxxxxxxxxxxx (4.5+)
Signed-off-by: Heinz Mauelshagen <heinzm@xxxxxxxxxx>
Signed-off-by: Shaohua Li <shli@xxxxxx>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 06f6e81f1516..23c6d732a374 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -307,7 +307,7 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
*/
void mddev_suspend(struct mddev *mddev)
{
- WARN_ON_ONCE(current == mddev->thread->tsk);
+ WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk);
if (mddev->suspended++)
return;
synchronize_rcu();
--
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