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watch_queue: Fix missing rcu annotation 

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: c73be61ced ("pipe: Add general notification queue support")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2022-07-28 10:31:06 +01:00 committed by Linus Torvalds
parent 6e7765cb47
commit e0339f036e
1 changed files with 1 additions and 1 deletions
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2
kernel/watch_queue.c
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@ -494,7 +494,7 @@ int add_watch_to_object(struct watch *watch, struct watch_list *wlist)
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);