netdev - Re: netpoll + xmit

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Message-ID: <20090731013017.GB25895@gondor.apana.org.au>
Date:	Fri, 31 Jul 2009 09:30:17 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Matt Mackall <mpm@...enic.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Matt Carlson <mcarlson@...adcom.com>
Subject: Re: netpoll + xmit_lock == deadlock

On Wed, Jul 29, 2009 at 09:06:39PM -0400, Neil Horman wrote:
>
> but nothing in that path takes the xmit_lock.  The poll_lock is taken in that
> patch, but thats for recieve_side syncronization, not transmit side.  Nothing in
> the tg3 driver (to use your example), that I can see takes the xmit_lock in the
> rx path either, so I'm not really sure where you comming from here.

tg3_poll => tg3_poll_work => tg3_tx => netif_tx_lock
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