* Patch "dm mpath: do not lock up a CPU with requeuing activity" has been added to the 4.12-stable tree
@ 2017-09-04 10:52 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2017-09-04 10:52 UTC (permalink / raw)
To: bart.vanassche, gregkh, hch, loberman, snitzer; +Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
dm mpath: do not lock up a CPU with requeuing activity
to the 4.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-mpath-do-not-lock-up-a-cpu-with-requeuing-activity.patch
and it can be found in the queue-4.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 1c23484c355ec360ca2f37914f8a4802c6baeead Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@wdc.com>
Date: Wed, 9 Aug 2017 11:32:12 -0700
Subject: dm mpath: do not lock up a CPU with requeuing activity
From: Bart Van Assche <bart.vanassche@wdc.com>
commit 1c23484c355ec360ca2f37914f8a4802c6baeead upstream.
When using the block layer in single queue mode, get_request()
returns ERR_PTR(-EAGAIN) if the queue is dying and the REQ_NOWAIT
flag has been passed to get_request(). Avoid that the kernel
reports soft lockup complaints in this case due to continuous
requeuing activity.
Fixes: 7083abbbf ("dm mpath: avoid that path removal can trigger an infinite loop")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Tested-by: Laurence Oberman <loberman@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/md/dm-mpath.c | 1 -
1 file changed, 1 deletion(-)
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -504,7 +504,6 @@ static int multipath_clone_and_map(struc
if (queue_dying) {
atomic_inc(&m->pg_init_in_progress);
activate_or_offline_path(pgpath);
- return DM_MAPIO_REQUEUE;
}
return DM_MAPIO_DELAY_REQUEUE;
}
Patches currently in stable-queue which might be from bart.vanassche@wdc.com are
queue-4.12/dm-mpath-do-not-lock-up-a-cpu-with-requeuing-activity.patch
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2017-09-04 10:52 Patch "dm mpath: do not lock up a CPU with requeuing activity" has been added to the 4.12-stable tree gregkh
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