Patch "raid10: include bio_end_io_list in nr_queued to prevent freeze_array hang" has been added to the 4.4-stable tree

Patch "raid10: include bio_end_io_list in nr_queued to prevent freeze_array hang" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    raid10: include bio_end_io_list in nr_queued to prevent freeze_array hang

to the 4.4-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:
     raid10-include-bio_end_io_list-in-nr_queued-to-prevent-freeze_array-hang.patch
and it can be found in the queue-4.4 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 23ddba80ebe836476bb2fa1f5ef305dd1c63dc0b Mon Sep 17 00:00:00 2001
From: Shaohua Li <shli@fb.com>
Date: Mon, 14 Mar 2016 11:49:32 -0700
Subject: raid10: include bio_end_io_list in nr_queued to prevent freeze_array hang

From: Shaohua Li <shli@fb.com>

commit 23ddba80ebe836476bb2fa1f5ef305dd1c63dc0b upstream.

This is the raid10 counterpart of the bug fixed by Nate
(raid1: include bio_end_io_list in nr_queued to prevent freeze_array hang)

Fixes: 95af587e95(md/raid10: ensure device failure recorded before write request returns)
Cc: Nate Dailey <nate.dailey@stratus.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/raid10.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2664,6 +2664,7 @@ static void handle_write_completed(struc
 		if (fail) {
 			spin_lock_irq(&conf->device_lock);
 			list_add(&r10_bio->retry_list, &conf->bio_end_io_list);
+			conf->nr_queued++;
 			spin_unlock_irq(&conf->device_lock);
 			md_wakeup_thread(conf->mddev->thread);
 		} else {
@@ -2691,8 +2692,10 @@ static void raid10d(struct md_thread *th
 		LIST_HEAD(tmp);
 		spin_lock_irqsave(&conf->device_lock, flags);
 		if (!test_bit(MD_CHANGE_PENDING, &mddev->flags)) {
-			list_add(&tmp, &conf->bio_end_io_list);
-			list_del_init(&conf->bio_end_io_list);
+			while (!list_empty(&conf->bio_end_io_list)) {
+				list_move(conf->bio_end_io_list.prev, &tmp);
+				conf->nr_queued--;
+			}
 		}
 		spin_unlock_irqrestore(&conf->device_lock, flags);
 		while (!list_empty(&tmp)) {


Patches currently in stable-queue which might be from shli@fb.com are

queue-4.4/raid10-include-bio_end_io_list-in-nr_queued-to-prevent-freeze_array-hang.patch
queue-4.4/md-multipath-don-t-hardcopy-bio-in-.make_request-path.patch
queue-4.4/raid5-revert-e9e4c377e2f563-to-fix-a-livelock.patch
queue-4.4/raid1-include-bio_end_io_list-in-nr_queued-to-prevent-freeze_array-hang.patch
queue-4.4/raid5-check_reshape-shouldn-t-call-mddev_suspend.patch
queue-4.4/md-raid5-compare-apples-to-apples-or-sectors-to-sectors.patch
queue-4.4/md-raid5-preserve-stripe_preread_active-in-break_stripe_batch_list.patch