Messages in this thread Patch in this message | | | Date | Thu, 11 May 2006 14:00:33 -0400 (EDT) | From | Alan Stern <> | Subject | [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>
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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; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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