netdev - Re: [ofa-general] NetEffect, iw

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Message-ID: <20090130065721.GA4886@gondor.apana.org.au>
Date:	Fri, 30 Jan 2009 17:57:21 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Roland Dreier <rdreier@...co.com>
Cc:	davem@...emloft.net, aluno3@...zta.onet.pl,
	general@...ts.openfabrics.org, netdev@...r.kernel.org
Subject: Re: [ofa-general] NetEffect, iw_nes and kernel warning

Roland Dreier <rdreier@...co.com> wrote:
> 
> OK, thanks... what confused me is that several other drivers also do
> skb_linearize() in their hard_start_xmit method... eg bnx2x,
> via-velocity, mv643xx_eth.  So there are several other lurking bugs to
> deal with here I guess.

I don't know about the rest but bnx2x is certainly OK since it
only does so with IRQ enabled.  It is legal to call skb_linearize
as long as you're sure that IRQs are enabled, which is always the
case for hard_start_xmit upon entry.

So the only time you can't call it in hard_start_xmit is if you've
just disabled IRQs yourself.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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