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Subject[ 03/23] [Suspend2] Allow a notifier to remove itself from the notifier list.
Date

This is Christoph Lameter's original patch, posted to LKML some time ago,
but as yet unmerged.

Allow a notifier to remove itself from the notifier list.

If the next pointer is retrieved before notifier_call then the notifier can
remove itself from the chain.

Signed-off-by: Christoph Lameter <christoph@lameter.com>
Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

kernel/sys.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/kernel/sys.c b/kernel/sys.c
index d09cac2..46455fa 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -174,15 +174,18 @@ int __kprobes notifier_call_chain(struct
{
int ret=NOTIFY_DONE;
struct notifier_block *nb = *n;
+ struct notifier_block *next;

while(nb)
{
- ret=nb->notifier_call(nb,val,v);
+ /* Determining next here allows the notifier to unregister itself */
+ next = nb->next;
+ ret = nb->notifier_call(nb,val,v);
if(ret&NOTIFY_STOP_MASK)
{
return ret;
}
- nb=nb->next;
+ nb = next;
}
return ret;
}
--
Nigel Cunningham nigel at suspend2 dot net
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