This is a note to let you know that I've just added the patch titled
md/raid1: intialise start_next_window for READ case to avoid hang
to the 3.16-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:
md-raid1-intialise-start_next_window-for-read-case-to-avoid-hang.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f0cc9a057151892b885be21a1d19b0185568281d Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@xxxxxxx>
Date: Mon, 22 Sep 2014 10:06:23 +1000
Subject: md/raid1: intialise start_next_window for READ case to avoid hang
From: NeilBrown <neilb@xxxxxxx>
commit f0cc9a057151892b885be21a1d19b0185568281d upstream.
r1_bio->start_next_window is not initialised in the READ
case, so allow_barrier may incorrectly decrement
conf->current_window_requests
which can cause raise_barrier() to block forever.
Fixes: 79ef3a8aa1cb1523cc231c9a90a278333c21f761
Reported-by: Brassow Jonathan <jbrassow@xxxxxxxxxx>
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/raid1.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1185,6 +1185,7 @@ read_again:
atomic_read(&bitmap->behind_writes) == 0);
}
r1_bio->read_disk = rdisk;
+ r1_bio->start_next_window = 0;
read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev);
bio_trim(read_bio, r1_bio->sector - bio->bi_iter.bi_sector,
Patches currently in stable-queue which might be from neilb@xxxxxxx are
queue-3.16/md-raid1-fix_read_error-should-act-on-all-non-faulty-devices.patch
queue-3.16/md-raid1-count-resync-requests-in-nr_pending.patch
queue-3.16/md-raid1-update-next_resync-under-resync_lock.patch
queue-3.16/md-raid1-intialise-start_next_window-for-read-case-to-avoid-hang.patch
queue-3.16/md-raid1-don-t-use-next_resync-to-determine-how-far-resync-has-progressed.patch
queue-3.16/md-raid1-be-more-cautious-where-we-read-balance-during-resync.patch
queue-3.16/md-raid1-make-sure-resync-waits-for-conflicting-writes-to-complete.patch
queue-3.16/md-raid1-clean-up-request-counts-properly-in-close_sync.patch
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