netdev - Re: [PATCH 2/2] mdio-mux-gpio: use new gpiod_get_array and gpiod_put

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Date:	Wed, 14 Jan 2015 14:01:38 +0100
From:	Rojhalat Ibrahim <imr@...chenk.de>
To:	Alexandre Courbot <gnurou@...il.com>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Alexandre Courbot <acourbot@...dia.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] mdio-mux-gpio: use new gpiod_get_array and gpiod_put_array functions

On Wednesday 14 January 2015 14:11:27 Alexandre Courbot wrote:
> On Sat, Jan 10, 2015 at 12:19 AM, Rojhalat Ibrahim <imr@...chenk.de> wrote:
> > Use the new gpiod_get_array and gpiod_put_array functions for obtaining and
> > disposing of GPIO descriptors.
> >
> > Signed-off-by: Rojhalat Ibrahim <imr@...chenk.de>
> > ---
> > This patch depends on my previous patch "gpiolib: add gpiod_get_array and
> > gpiod_put_array functions".
> >
> >  drivers/net/phy/mdio-mux-gpio.c |   28 ++++++++--------------------
> >  1 file changed, 8 insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
> > index 1eaf81e..35c37da 100644
> > --- a/drivers/net/phy/mdio-mux-gpio.c
> > +++ b/drivers/net/phy/mdio-mux-gpio.c
> > @@ -47,7 +47,6 @@ static int mdio_mux_gpio_probe(struct platform_device *pdev)
> >  {
> >         struct mdio_mux_gpio_state *s;
> >         int num_gpios;
> > -       unsigned int n;
> >         int r;
> >
> >         if (!pdev->dev.of_node)
> > @@ -63,16 +62,10 @@ static int mdio_mux_gpio_probe(struct platform_device *pdev)
> >
> >         s->num_gpios = num_gpios;
> >
> > -       for (n = 0; n < num_gpios; ) {
> > -               struct gpio_desc *gpio = gpiod_get_index(&pdev->dev, NULL, n,
> > -                                                        GPIOD_OUT_LOW);
> > -               if (IS_ERR(gpio)) {
> > -                       r = PTR_ERR(gpio);
> > -                       goto err;
> > -               }
> > -               s->gpio[n] = gpio;
> > -               n++;
> > -       }
> > +       r = gpiod_get_array(&pdev->dev, NULL, s->gpio, num_gpios,
> > +                           GPIOD_OUT_LOW);
> > +       if (r != num_gpios)
> > +               return r;
> >
> >         r = mdio_mux_init(&pdev->dev,
> >                           mdio_mux_gpio_switch_fn, &s->mux_handle, s);
> > @@ -80,22 +73,17 @@ static int mdio_mux_gpio_probe(struct platform_device *pdev)
> >         if (r == 0) {
> >                 pdev->dev.platform_data = s;
> >                 return 0;
> > +       } else {
> > +               gpiod_put_array(s->gpio, num_gpios);
> > +               return r;
> >         }
> 
> Suggestion: handle the errors in the if condition, and let normal
> execution be visible at the first level of indentation of the
> function. I.e:
> 
>     if (r != 0) {
>         gpiod_put_array(s->gpio, num_gpios);
>         return r;
>     }
> 
>     pdev->dev.platform_data = s;
>     return 0;
> 
> This is how previous errors are handled in this function and is
> generally a good thing to do as it makes the function's logic easier
> to follow.
> 

Ok, will do.

Thanks for the review.


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