linux-kernel - Re: [RESEND PATCH v6 6/6] leds: Add a multicolor LED driver to group monochromatic LEDs

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Date:   Wed, 28 Dec 2022 02:44:11 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:     lee@...nel.org, pavel@....cz, robh+dt@...nel.org,
        sven.schwermer@...ruptive-technologies.com,
        krzysztof.kozlowski+dt@...aro.org, johan+linaro@...nel.org,
        marijn.suijten@...ainline.org, jacek.anaszewski@...il.com,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v6 6/6] leds: Add a multicolor LED driver to group
 monochromatic LEDs

On Wed, Dec 28, 2022 at 2:41 AM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Tue, Dec 27, 2022 at 12:07 PM Jean-Jacques Hiblot
> <jjhiblot@...phandler.com> wrote:
> >
> > By allowing to group multiple monochrome LED into multicolor LEDs,
> > all involved LEDs can be controlled in-sync. This enables using effects
> > using triggers, etc.
>
> ...
>
> > +       count = 0;
> > +       max_brightness = 0;
> > +       for (;;) {
> > +               struct led_classdev *led_cdev;
> > +
> > +               led_cdev = devm_of_led_get_optional(dev, count);
>
> > +
>
> Redundant blank line.
>
> > +               if (IS_ERR(led_cdev))
> > +                       return dev_err_probe(dev, PTR_ERR(led_cdev),
> > +                                            "Unable to get led #%d", count);
> > +
> > +               /* Reached the end of the list ?*/
> > +               if (!led_cdev)
> > +                       break;
>
> > +               count++;
>
> If I understand the flow correctly, this can be moved...
>
> > +               priv->monochromatics = devm_krealloc_array(dev, priv->monochromatics,
> > +                                       count, sizeof(*priv->monochromatics),

Yes, here the + 1 will be needed instead. But I think it would be
better from the reader perspective, as we try to allocate memory for
existing amount + 1 as it would be clearly written.

> > +                                       GFP_KERNEL);
> > +               if (!priv->monochromatics)
> > +                       return -ENOMEM;
>
> > +               priv->monochromatics[count - 1] = led_cdev;
>
> ...here either as a separate line or a part of the above assignment,
> in either case the -1 wouldn't be needed.
>
>
> > +               max_brightness = max(max_brightness, led_cdev->max_brightness);
> > +       }

P.S. Bjorn's address is wrong.

-- 
With Best Regards,
Andy Shevchenko