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GFS2: Use an IS_ERR test rather than a NULL test 

In case of error, the function gfs2_inode_lookup returns an
ERR pointer, but never returns a NULL pointer. So a NULL test that
necessarily comes after an IS_ERR test should be deleted, and a NULL
test that may come after a call to this function should be
strengthened by an IS_ERR test.

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 = gfs2_inode_lookup(...)
... when != x = E
* if (x != NULL)
S1 else S2
// </smpl>

Signed-off-by:  Julien Brunel <brunel@diku.dk>
Signed-off-by:  Julia Lawall <julia@diku.dk>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Julien Brunel 2008-09-01 10:51:22 +02:00 committed by Steven Whitehouse
parent dff5257473
commit bd1eb8818c
1 changed files with 1 additions and 3 deletions
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4
fs/gfs2/inode.c
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@ -1033,13 +1033,11 @@ struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
if (bh)
brelse(bh);
if (!inode)
return ERR_PTR(-ENOMEM);
return inode;
fail_gunlock2:
gfs2_glock_dq_uninit(ghs + 1);
if (inode)
if (inode && !IS_ERR(inode))
iput(inode);
fail_gunlock:
gfs2_glock_dq(ghs);