netdev - Re: [0/8] netpoll/bridge fixes

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Date:	Fri, 11 Jun 2010 07:56:43 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Qianfeng Zhang <frzhang@...hat.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	WANG Cong <amwang@...hat.com>, Matt Mackall <mpm@...enic.com>
Subject: Re: [0/8] netpoll/bridge fixes

On Thu, Jun 10, 2010 at 07:49:12AM -0700, Stephen Hemminger wrote:
> 
> Thanks for looking at this, and yes the original code does
> look buggy. Not sure if I like the use of in_irq() to handle the netpoll
> packets as special case. Is in_irq() really reliable for this?

Yes because netpoll always calls ndo_start_xmit with IRQs disabled,
while on the normal TX path IRQs must be enabled (as otherwise
enabling BH would warn).

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