netdev - Re: [PATCH 4/4] dm9601: work around tx fifo sync issue on dm962x

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Message-Id: <20131218.174801.1302082781180839324.davem@davemloft.net>
Date:	Wed, 18 Dec 2013 17:48:01 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	peter@...sgaard.com
Cc:	netdev@...r.kernel.org, joseph_chang@...icom.com.tw,
	stable@...r.kernel.org
Subject: Re: [PATCH 4/4] dm9601: work around tx fifo sync issue on dm962x

From: Peter Korsgaard <peter@...sgaard.com>
Date: Mon, 16 Dec 2013 11:35:35 +0100

> Certain dm962x revisions contain an bug, where if a USB bulk transfer retry
> (E.G. if bulk crc mismatch) happens right after a transfer with odd or
> maxpacket length, the internal tx hardware fifo gets out of sync causing
> the interface to stop working.
> 
> Work around it by adding up to 3 bytes of padding to ensure this situation
> cannot trigger.
> 
> This workaround also means we never pass multiple-of-maxpacket size skb's
> to usbnet, so the length adjustment to handle usbnet's padding of those can
> be removed.
> 
> Cc: <stable@...r.kernel.org>
> Reported-by: Joseph Chang <joseph_chang@...icom.com.tw>
> Signed-off-by: Peter Korsgaard <peter@...sgaard.com>

Applied.
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