Allow a notifier to remove itself from the notifier list.
This is done by retrieving the pointer to the next notifier from the list before the
notifier call. If a notifier removes itself in the current kernel then the
pointer to the current notifier is invalid and notifier_call_chain
will fail.
Signed-off-by: Christoph Lameter <[email protected]>
Index: linux-2.6.13-rc3/kernel/sys.c
===================================================================
--- linux-2.6.13-rc3.orig/kernel/sys.c 2005-07-12 21:46:46.000000000 -0700
+++ linux-2.6.13-rc3/kernel/sys.c 2005-07-28 11:26:00.000000000 -0700
@@ -171,15 +171,18 @@
{
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;
}
-
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