linux-kernel - [PATCH v2] ceph: remove unnecessary check for NULL in parse

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Message-Id: <20230908112020.27090-1-lhenriques@suse.de>
Date:   Fri,  8 Sep 2023 12:20:20 +0100
From:   Luís Henriques <lhenriques@...e.de>
To:     Xiubo Li <xiubli@...hat.com>, Ilya Dryomov <idryomov@...il.com>,
        Jeff Layton <jlayton@...nel.org>,
        Milind Changire <mchangir@...hat.com>
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luís Henriques <lhenriques@...e.de>,
        Dan Carpenter <dan.carpenter@...aro.org>
Subject: [PATCH v2] ceph: remove unnecessary check for NULL in parse_longname()

Function ceph_get_inode() never returns NULL; instead it returns an
ERR_PTR() if something fails.  Thus, the check for NULL in parse_longname()
is useless and can be dropped.  Instead, move there the debug code that
does the error checking so that it's only executed if ceph_get_inode() is
called.

Fixes: dd66df0053ef ("ceph: add support for encrypted snapshot names")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Signed-off-by: Luís Henriques <lhenriques@...e.de>
---
Changes since v2:
As suggested by Xiubo, moved the error checking into the 'if (!dir)'
block.

 fs/ceph/crypto.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c
index e4d5cd56a80b..e1f31b86fd48 100644
--- a/fs/ceph/crypto.c
+++ b/fs/ceph/crypto.c
@@ -249,11 +249,9 @@ static struct inode *parse_longname(const struct inode *parent,
 	if (!dir) {
 		/* This can happen if we're not mounting cephfs on the root */
 		dir = ceph_get_inode(parent->i_sb, vino, NULL);
-		if (!dir)
-			dir = ERR_PTR(-ENOENT);
+		if (IS_ERR(dir))
+			dout("Can't find inode %s (%s)\n", inode_number, name);
 	}
-	if (IS_ERR(dir))
-		dout("Can't find inode %s (%s)\n", inode_number, name);
 
 out:
 	kfree(inode_number);