From: Julien Brunel <brunel@diku.dk>
Date: Thu, 16 Oct 2008 05:04:12 +0000 (-0700)
Subject: fs/reiserfs: use an IS_ERR test rather than a NULL test
X-Git-Tag: v2.6.28-rc1~359
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=67b172c097177835fbf5b0666885c4059a4f67ff;p=platform%2Fkernel%2Flinux-3.10.git

fs/reiserfs: use an IS_ERR test rather than a NULL test

In case of error, the function open_xa_dir returns an ERR pointer, but
never returns a NULL pointer.  So a NULL test that comes after an IS_ERR
test should be deleted.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@match_bad_null_test@
expression x, E;
statement S1,S2;
@@
x = open_xa_dir(...)
... when != x = E
(
*  if (x == NULL && ...) S1 else S2
|
*  if (x == NULL || ...) S1 else S2
)
// </smpl>

Signed-off-by: Julien Brunel <brunel@diku.dk>
Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Jan Kara <jack@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index bb3cb5b..ad92461 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -155,7 +155,7 @@ static struct dentry *get_xa_file_dentry(const struct inode *inode,
 	xadir = open_xa_dir(inode, flags);
 	if (IS_ERR(xadir)) {
 		return ERR_CAST(xadir);
-	} else if (xadir && !xadir->d_inode) {
+	} else if (!xadir->d_inode) {
 		dput(xadir);
 		return ERR_PTR(-ENODATA);
 	}