From 702f2d1e3b33617a8d9a9424f08a69b7c51642a7 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Fri, 5 Nov 2021 13:37:01 -0700
Subject: [PATCH] mm: don't automatically unregister bdis

All BDI users now unregister explicitly.

Link: https://lkml.kernel.org/r/20211021124441.668816-5-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/backing-dev.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 8a46a0a..768e9ae 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -965,8 +965,7 @@ static void release_bdi(struct kref *ref)
 	struct backing_dev_info *bdi =
 			container_of(ref, struct backing_dev_info, refcnt);
 
-	if (test_bit(WB_registered, &bdi->wb.state))
-		bdi_unregister(bdi);
+	WARN_ON_ONCE(test_bit(WB_registered, &bdi->wb.state));
 	WARN_ON_ONCE(bdi->dev);
 	wb_exit(&bdi->wb);
 	kfree(bdi);
-- 
2.7.4