From: David Howells dhowells@redhat.com
commit e0339f036ef4beb9b20f0b6532a1e0ece7f594c6 upstream.
Since __post_watch_notification() walks wlist->watchers with only the RCU read lock held, we need to use RCU methods to add to the list (we already use RCU methods to remove from the list).
Fix add_watch_to_object() to use hlist_add_head_rcu() instead of hlist_add_head() for that list.
Fixes: c73be61cede5 ("pipe: Add general notification queue support") Signed-off-by: David Howells dhowells@redhat.com Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- kernel/watch_queue.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/watch_queue.c +++ b/kernel/watch_queue.c @@ -494,7 +494,7 @@ int add_watch_to_object(struct watch *wa unlock_wqueue(wqueue); }
- hlist_add_head(&watch->list_node, &wlist->watchers); + hlist_add_head_rcu(&watch->list_node, &wlist->watchers); return 0; } EXPORT_SYMBOL(add_watch_to_object);