gfs2: remove IS_ERR_VALUE abuse

Picked from commit 287980e49ffc0f6d911601e7e352a812ed27768e ("remove lots
of IS_ERR_VALUE abuses") upstream.

The original fix that was backported to 3.18 already addressed the warning
in some configurations, but not in others, leaving us with the same output:

../fs/gfs2/dir.c: In function 'get_first_leaf':
../fs/gfs2/dir.c:768:9: warning: 'leaf_no' may be used uninitialized in this function [-Wmaybe-uninitialized]
   error = get_leaf(dip, leaf_no, bh_out);
         ^
../fs/gfs2/dir.c: In function 'dir_split_leaf.isra.20':
../fs/gfs2/dir.c:987:8: warning: 'leaf_no' may be used uninitialized in this function [-Wmaybe-uninitialized]

This takes the approach that we took in later versions in mainline,
but does not backport the entire patch, as that would be too large
for stable and IIRC caused regressions in other drivers.

Fixes: 9d46d31e9aea ("gfs2: avoid uninitialized variable warning")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index 9291cf5e7439f1410ad44944f5c8aaf68e0cdd2d..f3508f4583d5a42ad2592529f358de1858ff7b40 100644 (file)
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -749,12 +749,15 @@ static int get_leaf_nr(struct gfs2_inode *dip, u32 index,
                       u64 *leaf_out)
 {
        __be64 *hash;
+       int error;
 
        hash = gfs2_dir_get_hash_table(dip);
-       if (IS_ERR(hash))
-               return PTR_ERR(hash);
-       *leaf_out = be64_to_cpu(*(hash + index));
-       return 0;
+       error = PTR_ERR_OR_ZERO(hash);
+
+       if (!error)
+               *leaf_out = be64_to_cpu(*(hash + index));
+
+       return error;
 }
 
 static int get_first_leaf(struct gfs2_inode *dip, u32 index,
@@ -764,7 +767,7 @@ static int get_first_leaf(struct gfs2_inode *dip, u32 index,
        int error;
 
        error = get_leaf_nr(dip, index, &leaf_no);
-       if (!IS_ERR_VALUE(error))
+       if (!error)
                error = get_leaf(dip, leaf_no, bh_out);
 
        return error;
@@ -980,7 +983,7 @@ static int dir_split_leaf(struct inode *inode, const struct qstr *name)
 
        index = name->hash >> (32 - dip->i_depth);
        error = get_leaf_nr(dip, index, &leaf_no);
-       if (IS_ERR_VALUE(error))
+       if (error)
                return error;
 
        /*  Get the old leaf block  */