netdev - Re: dst_ifdown breaks infiniband?

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Message-ID: <20070318201826.GB27004@ms2.inr.ac.ru>
Date:	Sun, 18 Mar 2007 23:18:26 +0300
From:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
To:	"Michael S. Tsirkin" <mst@....mellanox.co.il>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, general@...ts.openfabrics.org,
	Roland Dreier <rolandd@...co.com>
Subject: Re: dst_ifdown breaks infiniband?

Hello!

> > 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.

Alexey
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