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Date:	Sun, 18 Mar 2007 23:18:26 +0300
From:	Alexey Kuznetsov <>
To:	"Michael S. Tsirkin" <>
Cc:	Linux Kernel Mailing List <>,,,
	Roland Dreier <>
Subject: Re: dst_ifdown breaks infiniband?


> > It should be cleared and we should be sure it will not be destroyed
> > before quiescent state.
> I'm confused. didn't you say dst_ifdown is called after quiescent state?

Quiescent state should happen after dst->neighbour is invalidated.
And this implies that all the users of dst->neighbour check validity
after dereference and do not use it after quiescent state.

> This does not sound like something that's likely to be accepted in 2.6.21, right?
> Any simpler ideas?

Well, if inifiniband destructor really needs to take that lock... no.
Right now I do not see.

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