netdev - Re: IPv4/IPv6 sysctl unregistration deadlock

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Message-ID: <20090226062257.GA11511@gondor.apana.org.au>
Date:	Thu, 26 Feb 2009 14:22:57 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: IPv4/IPv6 sysctl unregistration deadlock

On Wed, Feb 25, 2009 at 10:10:33PM -0800, Eric W. Biederman wrote:
>
> How does adding a rename operation to sysctl sound?

Yes that would definitely help.  Of course for the unregister case
we'd still need either an async removal or a no-op as Patrick
suggested.

> I am a little concerned that if we have this issue with sysctl
> we also have it with proc and sysfs as well.

Indeed.  /proc should be OK because it's all read-only so we don't
take the RTNL anywhere.  But sysfs may well have the same issue.

I think we should watch out for any more attempts at adding
netdev name-based sysfs nodes and nip them in the bud.

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