On Tue, Nov 27, 2007 at 07:21:08PM +0300, Pavel Emelyanov wrote:
> This hook is protected with the RCU, so simple
>
> if (br_should_route_hook)
> br_should_route_hook(...)
>
> is not enough on some architectures.
>
> Use the rcu_dereference/rcu_assign_pointer in this case.
>
> Fixed Stephen's comment concerning using the typeof().
>
> Signed-off-by: Pavel Emelyanov <xemul@xxxxxxxxxx>
Applied to net-2.6. Thanks Pavel!
> static void __exit ebtable_broute_fini(void)
> {
> - br_should_route_hook = NULL;
> + rcu_assign_pointer(br_should_route_hook, NULL);
Just for the record, rcu_assign_pointer is never necessary when
you're assigning NULL. The reason is that rcu_assign_pointer serves
as a barrier between the initialisation of the content of what you're
assigning and the actual assignment. Since NULL does not need to be
initialised you don't need the barrier :)
Hmm, perhaps we could even build this logic into rcu_assign_pointer.
Then again, who still uses an Alpha? Mine died years ago :)
Cheers,
--
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