diff options
author | Alan Stern <stern@rowland.harvard.edu> | 2006-06-25 08:47:15 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-25 13:01:01 -0400 |
commit | bbb1747d4e44ce49acc73daa8d66e5f6bd546f1b (patch) | |
tree | 28e9192804d3335e7585dd34bd4d5d9f236afc27 /kernel | |
parent | bfe5d834195b3089b8846577311340376cc0f450 (diff) |
[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>
Diffstat (limited to 'kernel')
-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, | |||
137 | unsigned long val, void *v) | 137 | unsigned long val, void *v) |
138 | { | 138 | { |
139 | int ret = NOTIFY_DONE; | 139 | int ret = NOTIFY_DONE; |
140 | struct notifier_block *nb; | 140 | struct notifier_block *nb, *next_nb; |
141 | 141 | ||
142 | nb = rcu_dereference(*nl); | 142 | nb = rcu_dereference(*nl); |
143 | while (nb) { | 143 | while (nb) { |
144 | next_nb = rcu_dereference(nb->next); | ||
144 | ret = nb->notifier_call(nb, val, v); | 145 | ret = nb->notifier_call(nb, val, v); |
145 | if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK) | 146 | if ((ret & NOTIFY_STOP_MASK) == NOTIFY_STOP_MASK) |
146 | break; | 147 | break; |
147 | nb = rcu_dereference(nb->next); | 148 | nb = next_nb; |
148 | } | 149 | } |
149 | return ret; | 150 | return ret; |
150 | } | 151 | } |