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

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Message-Id: <20130228.153942.1205752844713252540.davem@davemloft.net>
Date:	Thu, 28 Feb 2013 15:39:42 -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 1/1 net-next] fec: net: put tx to napi poll function to
 fix dead lock

From: Frank Li <Frank.Li@...escale.com>
Date: Thu, 28 Feb 2013 11:44:20 +0800

> +	int tx_pkts = fec_enet_tx(ndev);
> +
> +	if (tx_pkts)
> +		return budget;

This isn't right, you don't want to finish the NAPI poll because
TX work was done.

Ignore the TX work for poll completion purposes, see
drivers/net/ethernet/broadcom/tg3.c:tg3_poll_work() for
example.
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