Messages in this thread Patch in this message | | | Date | Thu, 28 Jul 2005 12:54:24 -0700 (PDT) | From | Christoph Lameter <> | Subject | [PATCH 1/4] Task notifier: Allow the removal of a notifier from the notifier handler |
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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 <christoph@lameter.com>
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; } - 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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