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-rw-r--r--fs/notify/mark.c25
1 files changed, 11 insertions, 14 deletions
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 7ecd15add6a7..f3a32ea15b49 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -255,23 +255,20 @@ void fsnotify_put_mark(struct fsnotify_mark *mark)
*/
static bool fsnotify_get_mark_safe(struct fsnotify_mark *mark)
{
- struct fsnotify_group *group;
-
if (!mark)
return true;
- group = mark->group;
- /*
- * Since acquisition of mark reference is an atomic op as well, we can
- * be sure this inc is seen before any effect of refcount increment.
- */
- atomic_inc(&group->user_waits);
- if (atomic_inc_not_zero(&mark->refcnt))
- return true;
-
- if (atomic_dec_and_test(&group->user_waits) && group->shutdown)
- wake_up(&group->notification_waitq);
-
+ if (atomic_inc_not_zero(&mark->refcnt)) {
+ spin_lock(&mark->lock);
+ if (mark->flags & FSNOTIFY_MARK_FLAG_ATTACHED) {
+ /* mark is attached, group is still alive then */
+ atomic_inc(&mark->group->user_waits);
+ spin_unlock(&mark->lock);
+ return true;
+ }
+ spin_unlock(&mark->lock);
+ fsnotify_put_mark(mark);
+ }
return false;
}