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

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Message-ID: <20130517082321.GA17056@katana>
Date:	Fri, 17 May 2013 10:23:40 +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 Wed, May 08, 2013 at 02:34:36PM +0100, Josef Ahmad wrote:
> From 8a4773d0c0df6fe2e816ad37fde30a2d90a1ad31 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>

Applied to for-current, thanks!

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