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watch_queue: Fix missing rcu annotation

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commit e0339f036e 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: c73be61ced ("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>
This commit is contained in:
David Howells
2022-07-28 10:31:06 +01:00
committed by Greg Kroah-Hartman
parent b38a8802c5
commit 45a84f04a9
1 changed files with 1 additions and 1 deletions
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kernel/watch_queue.c
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@@ -497,7 +497,7 @@ 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);