Re: [PATCH] i2c-designware: fix RX FIFO overrun
From: Wolfram Sang
Date: Thu Apr 25 2013 - 13:44:16 EST
On Wed, Apr 24, 2013 at 11:11:38AM +0100, Josef Ahmad wrote:
> From 8a4773d0c0df6fe2e816ad37fde30a2d90a1ad31 Mon Sep 17 00:00:00 2001
> From: Josef Ahmad <josef.ahmad@xxxxxxxxxxxxxxx>
> 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@xxxxxxxxxxxxxxx>
> Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Still can't apply :( Whitespace problems in the patch context :(
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