cifs: handle reconnect of tcon when there is no cached dfs referral

When there is no cached DFS referral of tcon->dfs_path, then reconnect
to same share.
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/connect.c

@@ -4144,7 +4144,8 @@ int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const stru
 	if (!tree)
 		return -ENOMEM;
 
-	if (!tcon->dfs_path) {
+	/* If it is not dfs or there was no cached dfs referral, then reconnect to same share */
+	if (!tcon->dfs_path || dfs_cache_noreq_find(tcon->dfs_path + 1, &ref, &tl)) {
 		if (tcon->ipc) {
 			scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
 			rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
@@ -4154,9 +4155,6 @@ int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const stru
 		goto out;
 	}
 
-	rc = dfs_cache_noreq_find(tcon->dfs_path + 1, &ref, &tl);
-	if (rc)
-		goto out;
 	isroot = ref.server_type == DFS_TYPE_ROOT;
 	free_dfs_info_param(&ref);