netdev - Re: [PATCH] ucc_geth: Fix full TX queue processing

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Date:	Tue, 19 Jan 2010 02:00:38 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	avorontsov@...mvista.com
Cc:	B06378@...escale.com, leoli@...escale.com,
	lsorense@...lub.uwaterloo.ca, netdev@...r.kernel.org,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH] ucc_geth: Fix full TX queue processing

From: Anton Vorontsov <avorontsov@...mvista.com>
Date: Mon, 18 Jan 2010 18:47:50 +0300

> From: Jiajun Wu <b06378@...escale.com>
> 
> commit 7583605b6d29f1f7f6fc505b883328089f3485ad ("ucc_geth: Fix empty
> TX queue processing") fixed empty TX queue mishandling, but didn't
> account another corner case: when TX queue becomes full.
> 
> Without this patch the driver will stop transmiting when TX queue
> becomes full since 'bd == ugeth->txBd[txQ]' actually checks for
> two things: queue empty or full.
> 
> Let's better check for NULL skb, which unambiguously signals an empty
> queue.
> 
> Signed-off-by: Jiajun Wu <b06378@...escale.com>
> Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>

Applied.
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