Patch "md: factor out a mddev_find_locked helper from mddev_find" has been added to the 5.12-stable tree

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

    md: factor out a mddev_find_locked helper from mddev_find

to the 5.12-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-factor-out-a-mddev_find_locked-helper-from-mddev_find.patch
and it can be found in the queue-5.12 subdirectory.

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


>From 8b57251f9a91f5e5a599de7549915d2d226cc3af Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@xxxxxx>
Date: Sat, 3 Apr 2021 18:15:28 +0200
Subject: md: factor out a mddev_find_locked helper from mddev_find

From: Christoph Hellwig <hch@xxxxxx>

commit 8b57251f9a91f5e5a599de7549915d2d226cc3af upstream.

Factor out a self-contained helper to just lookup a mddev by the dev_t
"unit".

Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Heming Zhao <heming.zhao@xxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Song Liu <song@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/md/md.c |   32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -734,6 +734,17 @@ void mddev_init(struct mddev *mddev)
 }
 EXPORT_SYMBOL_GPL(mddev_init);
 
+static struct mddev *mddev_find_locked(dev_t unit)
+{
+	struct mddev *mddev;
+
+	list_for_each_entry(mddev, &all_mddevs, all_mddevs)
+		if (mddev->unit == unit)
+			return mddev;
+
+	return NULL;
+}
+
 static struct mddev *mddev_find(dev_t unit)
 {
 	struct mddev *mddev;
@@ -761,13 +772,13 @@ static struct mddev *mddev_find_or_alloc
 	spin_lock(&all_mddevs_lock);
 
 	if (unit) {
-		list_for_each_entry(mddev, &all_mddevs, all_mddevs)
-			if (mddev->unit == unit) {
-				mddev_get(mddev);
-				spin_unlock(&all_mddevs_lock);
-				kfree(new);
-				return mddev;
-			}
+		mddev = mddev_find_locked(unit);
+		if (mddev) {
+			mddev_get(mddev);
+			spin_unlock(&all_mddevs_lock);
+			kfree(new);
+			return mddev;
+		}
 
 		if (new) {
 			list_add(&new->all_mddevs, &all_mddevs);
@@ -793,12 +804,7 @@ static struct mddev *mddev_find_or_alloc
 				return NULL;
 			}
 
-			is_free = 1;
-			list_for_each_entry(mddev, &all_mddevs, all_mddevs)
-				if (mddev->unit == dev) {
-					is_free = 0;
-					break;
-				}
+			is_free = !mddev_find_locked(dev);
 		}
 		new->unit = dev;
 		new->md_minor = MINOR(dev);


Patches currently in stable-queue which might be from hch@xxxxxx are

queue-5.12/md-factor-out-a-mddev_find_locked-helper-from-mddev_find.patch
queue-5.12/md-split-mddev_find.patch



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