linux-kernel - [PATCH AUTOSEL 5.1 05/70] staging: erofs: set sb->s_root to NULL when failing from _

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Message-Id: <20190608113950.8033-5-sashal@kernel.org>
Date:   Sat,  8 Jun 2019 07:38:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Chengguang Xu <cgxu519@...il.com>, Chao Yu <yuchao0@...wei.com>,
        Gao Xiang <gaoxiang25@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, devel@...verdev.osuosl.org
Subject: [PATCH AUTOSEL 5.1 05/70] staging: erofs: set sb->s_root to NULL when failing from __getname()

From: Chengguang Xu <cgxu519@...il.com>

[ Upstream commit f2dcb8841e6b155da098edae09125859ef7e853d ]

Set sb->s_root to NULL when failing from __getname(),
so that we can avoid double dput and unnecessary operations
in generic_shutdown_super().

Signed-off-by: Chengguang Xu <cgxu519@...il.com>
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Reviewed-by: Gao Xiang <gaoxiang25@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/erofs/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/erofs/super.c b/drivers/staging/erofs/super.c
index 15c784fba879..c8981662a49b 100644
--- a/drivers/staging/erofs/super.c
+++ b/drivers/staging/erofs/super.c
@@ -459,6 +459,7 @@ static int erofs_read_super(struct super_block *sb,
 	 */
 err_devname:
 	dput(sb->s_root);
+	sb->s_root = NULL;
 err_iget:
 #ifdef EROFS_FS_HAS_MANAGED_CACHE
 	iput(sbi->managed_cache);
-- 
2.20.1