linux-kernel - Re: [PATCH] i2c: cadence: Handle transfer

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Message-ID: <20200130080307.GA2208@ninjato>
Date:   Thu, 30 Jan 2020 09:03:07 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     alex.williams@...us.com
Cc:     mical.simek@...inx.com, linux-arm-kernel@...ts.infradead.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alex Williams <alex.williams@...com>
Subject: Re: [PATCH] i2c: cadence: Handle transfer_size rollover

On Thu, Jan 31, 2019 at 01:39:57PM -0800, alex.williams@...us.com wrote:
> From: Alex Williams <alex.williams@...com>
> 
> Under certain conditions, Cadence's I2C controller's transfer_size
> register will roll over and generate invalid read transactions. Before
> this change, the ISR relied solely on the RXDV bit to determine when to
> write more data to the user's buffer. The invalid read data would cause
> overruns, smashing stacks and worse.
> 
> This change stops the buffer writes to the requested boundary and
> reports the error. The controller will be reset so normal transactions
> may resume.
> 
> Signed-off-by: Alex Williams <alex.williams@...com>

Applied to for-next with another Rev-by from Michal given in another
thread, thanks!


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