reverse_path_check_proc(): don't bother with cookies

We know there's no loops by the time we call it; the
only thing we care about is too deep reverse paths.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 3e6f1f9..0f540e9 100644 (file)
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1311,7 +1311,7 @@ static int reverse_path_check_proc(struct file *file, int depth)
        int error = 0;
        struct epitem *epi;
 
-       if (!ep_push_nested(file)) /* limits recursion */
+       if (depth > EP_MAX_NESTS) /* too deep nesting */
                return -1;
 
        /* CTL_DEL can remove links here, but that can't increase our count */
@@ -1336,7 +1336,6 @@ static int reverse_path_check_proc(struct file *file, int depth)
                }
        }
        rcu_read_unlock();
-       nesting--; /* pop */
        return error;
 }