linux-kernel - Re: [PATCH v4 2/2] gpiolib: Fold conditionals into simple ternary operator

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Message-ID: <CAJZ5v0gpNzyBDKfBXoBYskUXs15GrZAe-E2vzhSEu2Nrj7wa7g@mail.gmail.com>
Date:   Mon, 8 Mar 2021 20:43:19 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH v4 2/2] gpiolib: Fold conditionals into simple ternary operator

On Mon, Mar 8, 2021 at 8:33 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> It's quite spread code to initialize IRQ domain options.
> Let's fold it into a simple oneliner.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> v4: new patch (see changelog of previous one)
>  drivers/gpio/gpiolib.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index afee48e7dd41..8c5ce377accc 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1458,7 +1458,7 @@ static int gpiochip_add_irqchip(struct gpio_chip *gc,
>  {
>         struct fwnode_handle *fwnode = dev_fwnode(&gc->gpiodev->dev);
>         struct irq_chip *irqchip = gc->irq.chip;
> -       const struct irq_domain_ops *ops = NULL;
> +       const struct irq_domain_ops *ops;

It looks like the ops local var is redundant.

>         unsigned int type;
>         unsigned int i;
>
> @@ -1496,11 +1496,7 @@ static int gpiochip_add_irqchip(struct gpio_chip *gc,
>                         return ret;
>         } else {
>                 /* Some drivers provide custom irqdomain ops */
> -               if (gc->irq.domain_ops)
> -                       ops = gc->irq.domain_ops;
> -
> -               if (!ops)
> -                       ops = &gpiochip_domain_ops;
> +               ops = gc->irq.domain_ops ?: &gpiochip_domain_ops;
>                 gc->irq.domain = irq_domain_create_simple(fwnode,
>                         gc->ngpio,
>                         gc->irq.first,

Because this can be

gc->irq.domain = irq_domain_add_simple(np,
                        gc->ngpio,
                        gc->irq.first,
                        gc->irq.domain_ops ?: &gpiochip_domain_ops,
                        gc);

(modulo white space / formatting) and this is the only place where ops
is used in this function.