linux-kernel - [PATCH 5.9 49/75] dm: fix double RCU unlock in dm_dax_zero_page

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Message-Id: <20201210142608.478512719@linuxfoundation.org>
Date:   Thu, 10 Dec 2020 15:27:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 5.9 49/75] dm: fix double RCU unlock in dm_dax_zero_page_range() error path

From: Mike Snitzer <snitzer@...hat.com>

commit f05c4403db5bba881d4964e731f6da35be46aabd upstream.

Remove redundant dm_put_live_table() in dm_dax_zero_page_range() error
path to fix sparse warning:
drivers/md/dm.c:1208:9: warning: context imbalance in 'dm_dax_zero_page_range' - unexpected unlock

Fixes: cdf6cdcd3b99a ("dm,dax: Add dax zero_page_range operation")
Cc: stable@...r.kernel.org
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm.c |    2 --
 1 file changed, 2 deletions(-)

--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1219,11 +1219,9 @@ static int dm_dax_zero_page_range(struct
 		 * ->zero_page_range() is mandatory dax operation. If we are
 		 *  here, something is wrong.
 		 */
-		dm_put_live_table(md, srcu_idx);
 		goto out;
 	}
 	ret = ti->type->dax_zero_page_range(ti, pgoff, nr_pages);
-
  out:
 	dm_put_live_table(md, srcu_idx);