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

[Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>]

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-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> 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-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> Acked-by: Mika Westerberg <mika.westerberg-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

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?