netdev - Re: IPv4/IPv6 sysctl unregistration deadlock

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Message-ID: <20090225061902.GA32430@gondor.apana.org.au>
Date:	Wed, 25 Feb 2009 14:19:03 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: IPv4/IPv6 sysctl unregistration deadlock

On Wed, Feb 25, 2009 at 06:23:33AM +0100, Patrick McHardy wrote:
>
> An easy fix would be to keep track of whether sysctl unregistration
> is in progress in IPv4/IPv6 and ignore new requests from that point
> on. Its not very elegant though, so I was wondering whether anyone
> has a better suggestion.

We could make the unregistration asynchronous and invoke a callback
when it's done.  Then we can simply hold a net_device refcount and
relinquish it in the callback.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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