[PATCH] NFS: Fix error handling in nfs_direct_write_result()

If the RPC call tanked, we should not be checking the return value
of data->res.verf->committed, since it is unlikely to even be
initialised.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfs/direct.c

@@ -532,10 +532,12 @@ static void nfs_direct_write_result(struct rpc_task *task, void *calldata)
 
 	spin_lock(&dreq->lock);
 
-	if (likely(status >= 0))
+	if (unlikely(status < 0)) {
+		dreq->error = status;
+		goto out_unlock;
+	}
+
 	dreq->count += data->res.count;
-	else
-		dreq->error = task->tk_status;
 
 	if (data->res.verf->committed != NFS_FILE_SYNC) {
 		switch (dreq->flags) {
@@ -550,7 +552,7 @@ static void nfs_direct_write_result(struct rpc_task *task, void *calldata)
 				}
 		}
 	}
-
+out_unlock:
 	spin_unlock(&dreq->lock);
 }