Messages in this thread |  | | Date | Mon, 19 Feb 2007 17:56:13 +0300 | From | Oleg Nesterov <> | Subject | Re: [PATCH 1/3] net/bridge/br_if.c: don't use _WORK_NAR |
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On 02/19, David Howells wrote: > > Hmmm... You've got a work_struct (well, a delayed_work actually) - can you > just punt the destruction of the object over to keventd to perform, I wonder?
Yes, this is close (I think) to what I suggested, see below,
> The big problem with that that I see is that the workqueue facility has no > guards in place against a work_struct's handler function running on several > CPUs at once in response to the same work_struct.
Yes. And for this problem WORK_STRUCT_NOAUTOREL does help, but not so much. It can prevent re-scheduling of the same work, but only if work->func() did not do work_release() yet.
> > I think the fix should be so that port_carrier_check() does get/put on > > "struct net_bridge_port" (container), but not on "struct net_device", and > > I'm not sure how this helps. You still have to get rid of the net_device at > some point.
Yes, destroy_nbp() does dev_put(dev). del_nbp() sets dev->br_port = NULL, port_carrier_check() goes to "done" in that case. So everething looks safe to me (but again, I do not even know what the "bridge" is :), so we should only take care about container, nothing more.
I'll try to make a patch for illustration on evening.
Oleg.
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