linux-kernel - [PATCH] fs/dcache: prevent repeated locking

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Message-Id: <20211207101646.401982-1-lv.ruyi@zte.com.cn>
Date:   Tue,  7 Dec 2021 10:16:46 +0000
From:   cgel.zte@...il.com
To:     viro@...iv.linux.org.uk
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lv Ruyi <lv.ruyi@....com.cn>, Zeal Robot <zealci@....com.cn>
Subject: [PATCH] fs/dcache: prevent repeated locking

From: Lv Ruyi <lv.ruyi@....com.cn>

Move the spin_lock above the restart to prevent to lock twice 
when the code goto restart.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
 fs/dcache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index c84269c6e8bf..8580d51b397a 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1102,8 +1102,8 @@ struct dentry *d_find_alias_rcu(struct inode *inode)
 void d_prune_aliases(struct inode *inode)
 {
 	struct dentry *dentry;
-restart:
 	spin_lock(&inode->i_lock);
+restart:
 	hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
 		spin_lock(&dentry->d_lock);
 		if (!dentry->d_lockref.count) {
-- 
2.25.1