Patch "md/raid5: add thread_group worker async_tx_issue_pending_all" has been added to the 4.9-stable tree

Patch "md/raid5: add thread_group worker async_tx_issue_pending_all" has been added to the 4.9-stable tree

[gregkh]

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

    md/raid5: add thread_group worker async_tx_issue_pending_all

to the 4.9-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-raid5-add-thread_group-worker-async_tx_issue_pending_all.patch
and it can be found in the queue-4.9 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 7e96d559634b73a8158ee99a7abece2eacec2668 Mon Sep 17 00:00:00 2001
From: Ofer Heifetz <oferh@marvell.com>
Date: Mon, 24 Jul 2017 09:17:40 +0300
Subject: md/raid5: add thread_group worker async_tx_issue_pending_all

From: Ofer Heifetz <oferh@marvell.com>

commit 7e96d559634b73a8158ee99a7abece2eacec2668 upstream.

Since thread_group worker and raid5d kthread are not in sync, if
worker writes stripe before raid5d then requests will be waiting
for issue_pendig.

Issue observed when building raid5 with ext4, in some build runs
jbd2 would get hung and requests were waiting in the HW engine
waiting to be issued.

Fix this by adding a call to async_tx_issue_pending_all in the
raid5_do_work.

Signed-off-by: Ofer Heifetz <oferh@marvell.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/raid5.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5843,6 +5843,8 @@ static void raid5_do_work(struct work_st
 	pr_debug("%d stripes handled\n", handled);
 
 	spin_unlock_irq(&conf->device_lock);
+
+	async_tx_issue_pending_all();
 	blk_finish_plug(&plug);
 
 	pr_debug("--- raid5worker inactive\n");


Patches currently in stable-queue which might be from oferh@marvell.com are

queue-4.9/md-raid5-add-thread_group-worker-async_tx_issue_pending_all.patch