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 <[email protected]>
---
Index: linux-2.6.17-rc3/kernel/sys.c
===================================================================
--- linux-2.6.17-rc3.orig/kernel/sys.c
+++ linux-2.6.17-rc3/kernel/sys.c
@@ -132,14 +132,15 @@ static int __kprobes notifier_call_chain
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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