linux-kernel - Re: [RFC PATCH] gpio: consumer: new virtual driver

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Message-ID: <ZM1YW025tD6S/y+Q@smile.fi.intel.com>
Date:   Fri, 4 Aug 2023 22:58:19 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Kent Gibson <warthog618@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [RFC PATCH] gpio: consumer: new virtual driver

On Fri, Aug 04, 2023 at 06:03:47PM +0200, Bartosz Golaszewski wrote:
> On Thu, Aug 3, 2023 at 1:39 PM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:

...

> > > +     if (list_empty(&dev->lookup_list))
> > > +             return -ENODATA;
> >
> > Instead you may count nodes here and if 0, return an error, otherwise pass it
> > to the callee.
> 
> I'm not following, please rephrase.

The below call calls list_count_nodes(), you may simply join these two checks
by calling list_count_nodes() and return -ENODATA in case it's 0.

> > > +     swnode = gpio_consumer_make_device_swnode(dev);
> > > +     if (IS_ERR(swnode))
> > > +             return PTR_ERR(swnode);

...

> > > +     if ((!live && !gpio_consumer_device_is_live_unlocked(dev)) ||
> > > +         (live && gpio_consumer_device_is_live_unlocked(dev)))
> >
> >         if (live ^ gpio_consumer_device_is_live_unlocked(dev))
> >
> > ?
> 
> Nah, let's not use bitwise operators for boolean logic.

Then it's even simpler:

	if (live == gpio_consumer_device_is_live_unlocked(dev))

-- 
With Best Regards,
Andy Shevchenko