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| author | Alan Stern <stern@rowland.harvard.edu> | 2006-06-25 05:47:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-25 10:01:01 -0700 |
| commit | bbb1747d4e44ce49acc73daa8d66e5f6bd546f1b (patch) | |
| tree | 28e9192804d3335e7585dd34bd4d5d9f236afc27 | |
| parent | bfe5d834195b3089b8846577311340376cc0f450 (diff) | |
| download | lwn-bbb1747d4e44ce49acc73daa8d66e5f6bd546f1b.tar.gz lwn-bbb1747d4e44ce49acc73daa8d66e5f6bd546f1b.zip | |
[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>
| -rw-r--r-- | kernel/sys.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index 90930b28d2ca..7e0927bad713 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -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; } |