linux-kernel - Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver

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Message-ID: <YNr5ZRhT3qn+e9/m@ninjato>
Date:   Tue, 29 Jun 2021 12:43:49 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Jie Deng <jie.deng@...el.com>, linux-i2c@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, mst@...hat.com, jasowang@...hat.com,
        andriy.shevchenko@...ux.intel.com, conghui.chen@...el.com,
        arnd@...db.de, kblaiech@...lanox.com,
        jarkko.nikula@...ux.intel.com, Sergey.Semin@...kalelectronics.ru,
        rppt@...nel.org, loic.poulain@...aro.org, tali.perry1@...il.com,
        u.kleine-koenig@...gutronix.de, bjorn.andersson@...aro.org,
        yu1.wang@...el.com, shuo.a.liu@...el.com, stefanha@...hat.com,
        pbonzini@...hat.com
Subject: Re: [PATCH v10] i2c: virtio: add a virtio i2c frontend driver


> From the spec:
> 
> The case when ``length of \field{write_buf}''=0, and at the same time,
> ``length of \field{read_buf}''=0 doesn't make any sense.
> 
> I mentioned this in my first reply and to my understanding I did not get
> a reply that this has changed meanwhile.
> 

Also, this code as mentioned before:

> +             if (!msgs[i].len)
> +                     break;

I hope this can extended in the future to allow zero-length messages. If
this is impossible we need to set an adapter quirk instead.


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