linux-kernel - Re: [PATCH v2 3/5] spi: Add support for Renesas CSI

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Message-ID: <ZKVE-AVDhvZyrJmj@surfacebook>
Date:   Wed, 5 Jul 2023 13:24:56 +0300
From:   andy.shevchenko@...il.com
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        Mark Brown <broonie@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Magnus Damm <magnus.damm@...il.com>,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>
Subject: Re: [PATCH v2 3/5] spi: Add support for Renesas CSI

Mon, Jul 03, 2023 at 12:19:26PM +0200, Geert Uytterhoeven kirjoitti:
> On Thu, Jun 22, 2023 at 1:34 PM Fabrizio Castro
> <fabrizio.castro.jz@...esas.com> wrote:

...

> > +       if (csi->txbuf)
> > +               /*
> > +                * Leaving a little bit of headroom in the FIFOs makes it very
> > +                * hard to raise an overflow error (which is only possible
> > +                * when IP transmits and receives at the same time).
> > +                */
> > +               to_transfer = min_t(int, CSI_FIFO_HALF_SIZE, bytes_remaining);
> > +       else
> > +               to_transfer = min_t(int, CSI_FIFO_SIZE_BYTES, bytes_remaining);
> 
> Why min_t(int, ...)? Both values are int.

min_t() should be used with a great care.

> It would be better to make both unsigned, though.

I believe you are assuming 3 (three) values and not 2 (two) under "both"
(one variable and two definitions).

-- 
With Best Regards,
Andy Shevchenko