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

[Wolfram Sang <wsa@the-dreams.de>]

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@linux.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@linux.intel.com>
> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Applied to for-current, thanks!