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>

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 8a46a0a..768e9ae 100644 (file)
--- 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);