netdev - Re: [PATCH v3 1/1 net-next] net: fec: put tx to napi poll function to fix dead lock

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Message-Id: <20130304.141507.1100300683952317840.davem@davemloft.net>
Date:	Mon, 04 Mar 2013 14:15:07 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	Frank.Li@...escale.com
Cc:	lznuaa@...il.com, shawn.guo@...aro.org, B38611@...escale.com,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	s.hauer@...gutronix.de
Subject: Re: [PATCH v3 1/1 net-next] net: fec: put tx to napi poll function
 to fix dead lock

From: Frank Li <Frank.Li@...escale.com>
Date: Mon, 4 Mar 2013 11:34:25 +0800

> up stack ndo_start_xmit already hold lock.
> fec_enet_start_xmit needn't spin lock.
> stat_xmit just update fep->cur_tx
> fec_enet_tx just update fep->dirty_tx
> 
> Reserve a empty bdb to check full or empty
> cur_tx == dirty_tx    means full
> cur_tx == dirty_tx +1 means empty
> 
> So needn't is_full variable.
 ...
> Signed-off-by: Frank Li <Frank.Li@...escale.com>

Applied.
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