Commit bbb1747d authored Jun 25, 2006 by Alan Stern Committed by Linus Torvalds Jun 25, 2006

[PATCH] Allow raw_notifier callouts to unregister themselves



Since raw_notifier chains don't benefit from any centralized locking
protections, they shouldn't suffer from the associated limitations.  Under
some circumstances it might make sense for a raw_notifier callout routine
to unregister itself from the notifier chain.  This patch (as678) changes
the notifier core to allow for such things.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent bfe5d834

kernel/sys.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -137,14 +137,15 @@ static int __kprobes notifier_call_chain(struct notifier_block **nl,
		unsigned long val, void *v)
		{
		int ret = NOTIFY_DONE;
		struct notifier_block *nb;
		struct notifier_block nb, next_nb;

		nb = rcu_dereference(*nl);
		while (nb) {
		next_nb = rcu_dereference(nb->next);
		ret = nb->notifier_call(nb, val, v);
		if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK)
		break;
		nb = rcu_dereference(nb->next);
		nb = next_nb;
		}
		return ret;
		}