From: Liang Chen <liangchen.linux@gmail.com>
Date: Thu, 23 Jan 2020 17:01:26 +0000 (+0800)
Subject: bcache: cached_dev_free needs to put the sb page
X-Git-Tag: v5.4.22~59
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f7d8ebf26d239ed7f9cc4b940ff240d78c4b61d1;p=thirdparty%2Fkernel%2Fstable.git

bcache: cached_dev_free needs to put the sb page

[ Upstream commit e8547d42095e58bee658f00fef8e33d2a185c927 ]

Same as cache device, the buffer page needs to be put while
freeing cached_dev.  Otherwise a page would be leaked every
time a cached_dev is stopped.

Signed-off-by: Liang Chen <liangchen.linux@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 64999c7a8033f..b86cf72033401 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1274,6 +1274,9 @@ static void cached_dev_free(struct closure *cl)
 
 	mutex_unlock(&bch_register_lock);
 
+	if (dc->sb_bio.bi_inline_vecs[0].bv_page)
+		put_page(bio_first_page_all(&dc->sb_bio));
+
 	if (!IS_ERR_OR_NULL(dc->bdev))
 		blkdev_put(dc->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);