linux-kernel - Re: [PATCH 2/4] i2c: xlp9xx: Fix issue seen when updating receive length

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Message-ID: <20180522120835.okaho5xuahtozhoc@ninjato>
Date:   Tue, 22 May 2018 14:08:35 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     George Cherian <george.cherian@...ium.com>
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        jglauber@...ium.com, kamlakant.patel@...ium.com,
        mchehab+samsung@...nel.org, davem@...emloft.net,
        gregkh@...uxfoundation.org, akpm@...ux-foundation.org,
        linus.walleij@...aro.org, rdunlap@...radead.org,
        Jayachandran C <jnair@...iumnetworks.com>
Subject: Re: [PATCH 2/4] i2c: xlp9xx: Fix issue seen when updating receive
 length

On Wed, May 16, 2018 at 12:00:17AM -0700, George Cherian wrote:
> The hardware does not handle updates to the length register gracefully
> if the new value is less than the number of bytes received so far. If
> this happens, the i2c controller will not stop the receive transaction
> properly.
> 
> Fix this by ensuring that the updated length is ok. This is done by
> making sure that the new length written to hardware is at least few
> bytes more than the bytes received so far.
> 
> While at that refactor the length updation to a new function.
> 
> Signed-off-by: Jayachandran C <jnair@...iumnetworks.com>
> Signed-off-by: George Cherian <george.cherian@...ium.com>

Applied to for-next, thanks!


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