Re: [PATCH 6/6] nvmem: increase the reference count of a gpio passed over config

[Bartosz Golaszewski]

pon., 17 lut 2020 o 22:13 Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> napisaÅ(a):
>
> Hi Bartosz,
>
> On Mon, Feb 17, 2020 at 8:56 PM Bartosz Golaszewski <brgl@xxxxxxxx> wrote:
> > From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> >
> > We can obtain the write-protect GPIO in nvmem_register() by requesting
> > it ourselves or by storing the gpio_desc passed in nvmem_config. In the
> > latter case we need to increase the reference count so that it gets
> > freed correctly.
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
>
> Thanks for your patch!
>
> > --- a/drivers/nvmem/core.c
> > +++ b/drivers/nvmem/core.c
> > @@ -349,11 +349,13 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
> >                 return ERR_PTR(rval);
> >         }
> >
> > -       if (config->wp_gpio)
> > +       if (config->wp_gpio) {
> >                 nvmem->wp_gpio = config->wp_gpio;
> > -       else
> > +               gpiod_ref(config->wp_gpio);
>
> If gpiod_ref() would return the passed GPIO, or an error code, you could write
>
>         nvmem->wp_gpio = gpiod_ref(config->wp_gpio);
>

Yes, makes perfect sense - v2 coming up tomorrow.

Bart