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[PATCH] Allow raw_notifier callouts to unregister themselves

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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>
This commit is contained in:
Alan Stern 2006-06-25 05:47:15 -07:00 committed by Linus Torvalds
parent bfe5d83419
commit bbb1747d4e
1 changed files with 3 additions and 2 deletions
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5
kernel/sys.c
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@ -137,14 +137,15 @@ static int __kprobes notifier_call_chain(struct notifier_block **nl,
unsigned long val, void *v) unsigned long val, void *v)
{ {
int ret = NOTIFY_DONE; int ret = NOTIFY_DONE;
struct notifier_block *nb; struct notifier_block *nb, *next_nb;
nb = rcu_dereference(*nl); nb = rcu_dereference(*nl);
while (nb) { while (nb) {
next_nb = rcu_dereference(nb->next);
ret = nb->notifier_call(nb, val, v); ret = nb->notifier_call(nb, val, v);
if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK) if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK)
break; break;
nb = rcu_dereference(nb->next); nb = next_nb;
} }
return ret; return ret;
} }