tree 6ed3c6c8fc2ad4c824c7d2c942fe7d3ece924dc7
parent 4baf8c9201e88546918cbfa61ea8062c38bc1644
author Julia Lawall <julia@diku.dk> 1249667493 -0400
committer Chris Mason <chris.mason@oracle.com> 1249667493 -0400

Btrfs: correct error-handling zlib error handling

find_zlib_workspace returns an ERR_PTR value in an error case instead of NULL.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@match exists@
expression x, E;
statement S1, S2;
@@

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

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Chris Mason <chris.mason@oracle.com>