[dm-devel] Patch "dm: remove flush_scheduled_work() during local_exit()" has been added to the 5.4-stable tree

[Sasha Levin]

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

    dm: remove flush_scheduled_work() during local_exit()

to the 5.4-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:
     dm-remove-flush_scheduled_work-during-local_exit.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.



commit 95dc6055f8abcf48472cb59bbb50a277f5345fa9
Author: Mike Snitzer <snitzer at kernel.org>
Date:   Tue Feb 14 13:06:05 2023 -0500

    dm: remove flush_scheduled_work() during local_exit()
    
    [ Upstream commit 0b22ff5360f5c4e11050b89206370fdf7dc0a226 ]
    
    Commit acfe0ad74d2e1 ("dm: allocate a special workqueue for deferred
    device removal") switched from using system workqueue to a single
    workqueue local to DM.  But it didn't eliminate the call to
    flush_scheduled_work() that was introduced purely for the benefit of
    deferred device removal with commit 2c140a246dc ("dm: allow remove to
    be deferred").
    
    Since DM core uses its own workqueue (and queue_work) there is no need
    to call flush_scheduled_work() from local_exit().  local_exit()'s
    destroy_workqueue(deferred_remove_workqueue) handles flushing work
    started with queue_work().
    
    Fixes: acfe0ad74d2e1 ("dm: allocate a special workqueue for deferred device removal")
    Signed-off-by: Mike Snitzer <snitzer at kernel.org>
    Signed-off-by: Sasha Levin <sashal at kernel.org>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index d4cebb38709bd..b58ff1a0fda7d 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -263,7 +263,6 @@ static int __init local_init(void)
 
 static void local_exit(void)
 {
-	flush_scheduled_work();
 	destroy_workqueue(deferred_remove_workqueue);
 
 	unregister_blkdev(_major, _name);