netdev - Re: [PATCH 3/3] stmmac: fix Transmit Underflow error

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Date:	Mon, 11 Apr 2011 12:56:39 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	peppe.cavallaro@...com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 3/3] stmmac: fix Transmit Underflow error

From: Giuseppe CAVALLARO <peppe.cavallaro@...com>
Date: Mon, 11 Apr 2011 11:16:46 +0200

> On some old MAC chips without COE sometime the
> Transmit Underflow error is issued.
> 
> The driver aborted all the transmission process
> and initialized it from scratch.
> This breaks the network activity as raised by Nachiketa
> on a SPEAr board.
> 
> The patch is to fix this rare underflow event.
> The driver will only clear the interrupt and the Tx
> DMA will go out the Suspend state as soon as the
> descriptor is fetched again.
> The driver will continue to bump-up the DMA FIFO threshold
> that, indeed, helped somebody to prevent this kind of error
> in the past as well.
> 
> Reported-by: Nachiketa Prachanda <nprachanda@...mputing.com>
> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>

Applied.
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