linux-kernel - [PATCH] kernfs: checking for IS

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Date:   Wed, 30 Aug 2017 17:04:56 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Shaohua Li <shli@...com>, linux-block@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>
Cc:     Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] kernfs: checking for IS_ERR() instead of NULL

The kernfs_get_inode() returns NULL on error, it never returns error
pointers.

Fixes: aa8188253474 ("kernfs: add exportfs operations")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 7c452f4d83e9..95a7c88baed9 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -99,8 +99,8 @@ static struct inode *kernfs_fh_get_inode(struct super_block *sb,
 		return ERR_PTR(-ESTALE);
 	inode = kernfs_get_inode(sb, kn);
 	kernfs_put(kn);
-	if (IS_ERR(inode))
-		return ERR_CAST(inode);
+	if (!inode)
+		return ERR_PTR(-ESTALE);
 
 	if (generation && inode->i_generation != generation) {
 		/* we didn't find the right inode.. */