Patch "md: restore 'noio_flag' for the last mddev_resume()" has been added to the 6.4-stable tree

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

    md: restore 'noio_flag' for the last mddev_resume()

to the 6.4-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:
     md-restore-noio_flag-for-the-last-mddev_resume.patch
and it can be found in the queue-6.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 6e9911e3fb7ca7d15719ac6fe7d513afb9678613
Author: Yu Kuai <yukuai3@xxxxxxxxxx>
Date:   Wed Jun 28 09:29:31 2023 +0800

    md: restore 'noio_flag' for the last mddev_resume()
    
    [ Upstream commit e24ed04389f9619e0aaef615a8948633c182a8b0 ]
    
    memalloc_noio_save() is called for the first mddev_suspend(), and
    repeated mddev_suspend() only increase 'suspended'. However,
    memalloc_noio_restore() is also called for the first mddev_resume(),
    which means that memory reclaim will be enabled before the last
    mddev_resume() is called, while the array is still suspended.
    
    Fix this problem by restore 'noio_flag' for the last mddev_resume().
    
    Fixes: 78f57ef9d50a ("md: use memalloc scope APIs in mddev_suspend()/mddev_resume()")
    Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230628012931.88911-3-yukuai1@xxxxxxxxxxxxxxx
    Signed-off-by: Song Liu <song@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 32d7ba8069aef..a2904e10ae35e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -477,11 +477,13 @@ EXPORT_SYMBOL_GPL(mddev_suspend);
 
 void mddev_resume(struct mddev *mddev)
 {
-	/* entred the memalloc scope from mddev_suspend() */
-	memalloc_noio_restore(mddev->noio_flag);
 	lockdep_assert_held(&mddev->reconfig_mutex);
 	if (--mddev->suspended)
 		return;
+
+	/* entred the memalloc scope from mddev_suspend() */
+	memalloc_noio_restore(mddev->noio_flag);
+
 	percpu_ref_resurrect(&mddev->active_io);
 	wake_up(&mddev->sb_wait);
 	mddev->pers->quiesce(mddev, 0);



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