linux-kernel - [PATCH] ceph: remove unnecessary IS_ERR() check in ceph_fname_to

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Date:   Fri, 29 Sep 2023 10:12:06 +0100
From:   Luis Henriques <lhenriques@...e.de>
To:     Xiubo Li <xiubli@...hat.com>, Ilya Dryomov <idryomov@...il.com>,
        Jeff Layton <jlayton@...nel.org>
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luis Henriques <lhenriques@...e.de>,
        kernel test robot <lkp@...el.com>,
        Dan Carpenter <dan.carpenter@...aro.org>
Subject: [PATCH] ceph: remove unnecessary IS_ERR() check in ceph_fname_to_usr()

Before returning, function ceph_fname_to_usr() does a final IS_ERR() check
in 'dir':

	if ((dir != fname->dir) && !IS_ERR(dir)) {...}

This check is unnecessary because, if the 'dir' variable has changed to
something other than 'fname->dir' (it's initial value), that error check has
been performed already and, if there was indeed an error, it would have
been returned immediately.

Besides, this useless IS_ERR() is also confusing static analysis tools.

Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/r/202309282202.xZxGdvS3-lkp@intel.com/
Signed-off-by: Luis Henriques <lhenriques@...e.de>
---
 fs/ceph/crypto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c
index e4d5cd56a80b..e19019209cf0 100644
--- a/fs/ceph/crypto.c
+++ b/fs/ceph/crypto.c
@@ -462,7 +462,7 @@ int ceph_fname_to_usr(const struct ceph_fname *fname, struct fscrypt_str *tname,
 out:
 	fscrypt_fname_free_buffer(&_tname);
 out_inode:
-	if ((dir != fname->dir) && !IS_ERR(dir)) {
+	if (dir != fname->dir) {
 		if ((dir->i_state & I_NEW))
 			discard_new_inode(dir);
 		else