linux-kernel - Re: [PATCH] i2c-designware: fix RX FIFO overrun

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Message-ID: <20130423163543.GB3228@the-dreams.de>
Date:	Tue, 23 Apr 2013 18:35:43 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Josef Ahmad <josef.ahmad@...ux.intel.com>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Jean Delvare <khali@...ux-fr.org>, Stefan Roese <sr@...x.de>,
	Axel Lin <axel.lin@...il.com>, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Dirk Brandewie <dirk.brandewie@...il.com>
Subject: Re: [PATCH] i2c-designware: fix RX FIFO overrun

On Mon, Apr 22, 2013 at 03:08:59PM +0100, Josef Ahmad wrote:
> From a969728248c3b439dc97a69e7dac133b5efa34e7 Mon Sep 17 00:00:00 2001
> From: Josef Ahmad <josef.ahmad@...ux.intel.com>
> Date: Fri, 19 Apr 2013 17:28:10 +0100
> Subject: [PATCH] i2c-designware: fix RX FIFO overrun
> 
> i2c_dw_xfer_msg() pushes a number of bytes to transmit/receive
> to/from the bus into the TX FIFO.
> For master-rx transactions, the maximum amount of data that can be
> received is calculated depending solely on TX and RX FIFO load.
> 
> This is racy - TX FIFO may contain master-rx data yet to be
> processed, which will eventually land into the RX FIFO. This
> data is not taken into account and the function may request more
> data than the controller is actually capable of storing.
> 
> This patch ensures the driver takes into account the outstanding
> master-rx data in TX FIFO to prevent RX FIFO overrun.
> 
> Signed-off-by: Josef Ahmad <josef.ahmad@...ux.intel.com>
> Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

This driver had a major cleanup meanwhile. Could you rebase your patch
on top of my for-next branch? I guess this version should make it into
stable?

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