{
int status = -ENOENT;
- /*
- * If fl_blocker is NULL, it won't be set again as this thread
- * "owns" the lock and is the only one that might try to claim
- * the lock. So it is safe to test fl_blocker locklessly.
- * Also if fl_blocker is NULL, this waiter is not listed on
- * fl_blocked_requests for some lock, so no other request can
- * be added to the list of fl_blocked_requests for this
- * request. So if fl_blocker is NULL, it is safe to
- * locklessly check if fl_blocked_requests is empty. If both
- * of these checks succeed, there is no need to take the lock.
- */
- if (waiter->fl_blocker == NULL &&
- list_empty(&waiter->fl_blocked_requests))
- return status;
spin_lock(&blocked_lock_lock);
if (waiter->fl_blocker)
status = 0;