Commit bbb1747d authored by Alan Stern's avatar Alan Stern Committed by Linus Torvalds

[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: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent bfe5d834
......@@ -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;
}
......
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