[v1,1/1] gpio: sch: make irq_chip immutable

Since recently, the kernel is nagging about mutable irq_chips:

   "not an immutable chip, please consider fixing it!"

Drop the unneeded copy, flag it as IRQCHIP_IMMUTABLE, add the new
helper functions and call the appropriate gpiolib functions.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/gpio/gpio-sch.c | 35 ++++++++++++++++++++++-------------
 1 file changed, 22 insertions(+), 13 deletions(-)

On Wed, Jun 1, 2022 at 5:37 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> Since recently, the kernel is nagging about mutable irq_chips:
>
>    "not an immutable chip, please consider fixing it!"
>
> Drop the unneeded copy, flag it as IRQCHIP_IMMUTABLE, add the new
> helper functions and call the appropriate gpiolib functions.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---
>  drivers/gpio/gpio-sch.c | 35 ++++++++++++++++++++++-------------
>  1 file changed, 22 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpio/gpio-sch.c b/drivers/gpio/gpio-sch.c
> index acda4c5052d3..8a83f7bf4382 100644
> --- a/drivers/gpio/gpio-sch.c
> +++ b/drivers/gpio/gpio-sch.c
> @@ -38,7 +38,6 @@
>
>  struct sch_gpio {
>         struct gpio_chip chip;
> -       struct irq_chip irqchip;
>         spinlock_t lock;
>         unsigned short iobase;
>         unsigned short resume_base;
> @@ -218,11 +217,9 @@ static void sch_irq_ack(struct irq_data *d)
>         spin_unlock_irqrestore(&sch->lock, flags);
>  }
>
> -static void sch_irq_mask_unmask(struct irq_data *d, int val)
> +static void sch_irq_mask_unmask(struct gpio_chip *gc, irq_hw_number_t gpio_num, int val)
>  {
> -       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
>         struct sch_gpio *sch = gpiochip_get_data(gc);
> -       irq_hw_number_t gpio_num = irqd_to_hwirq(d);
>         unsigned long flags;
>
>         spin_lock_irqsave(&sch->lock, flags);
> @@ -232,14 +229,32 @@ static void sch_irq_mask_unmask(struct irq_data *d, int val)
>
>  static void sch_irq_mask(struct irq_data *d)
>  {
> -       sch_irq_mask_unmask(d, 0);
> +       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +       irq_hw_number_t gpio_num = irqd_to_hwirq(d);
> +
> +       sch_irq_mask_unmask(gc, gpio_num, 0);
> +       gpiochip_disable_irq(gc, gpio_num);
>  }
>
>  static void sch_irq_unmask(struct irq_data *d)
>  {
> -       sch_irq_mask_unmask(d, 1);
> +       struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +       irq_hw_number_t gpio_num = irqd_to_hwirq(d);
> +
> +       gpiochip_enable_irq(gc, gpio_num);
> +       sch_irq_mask_unmask(gc, gpio_num, 1);
>  }
>
> +static const struct irq_chip sch_irqchip = {
> +       .name = "sch_gpio",
> +       .irq_ack = sch_irq_ack,
> +       .irq_mask = sch_irq_mask,
> +       .irq_unmask = sch_irq_unmask,
> +       .irq_set_type = sch_irq_type,
> +       .flags = IRQCHIP_IMMUTABLE,
> +       GPIOCHIP_IRQ_RESOURCE_HELPERS,
> +};
> +
>  static u32 sch_gpio_gpe_handler(acpi_handle gpe_device, u32 gpe, void *context)
>  {
>         struct sch_gpio *sch = context;
> @@ -367,14 +382,8 @@ static int sch_gpio_probe(struct platform_device *pdev)
>
>         platform_set_drvdata(pdev, sch);
>
> -       sch->irqchip.name = "sch_gpio";
> -       sch->irqchip.irq_ack = sch_irq_ack;
> -       sch->irqchip.irq_mask = sch_irq_mask;
> -       sch->irqchip.irq_unmask = sch_irq_unmask;
> -       sch->irqchip.irq_set_type = sch_irq_type;
> -
>         girq = &sch->chip.irq;
> -       girq->chip = &sch->irqchip;
> +       gpio_irq_chip_set_chip(girq, &sch_irqchip);
>         girq->num_parents = 0;
>         girq->parents = NULL;
>         girq->parent_handler = NULL;
> --
> 2.35.1
>

Reviewed-by: Bartosz Golaszewski <brgl@bgdev.pl>

On Wed, Jun 01, 2022 at 07:19:22PM +0200, Bartosz Golaszewski wrote:
> On Wed, Jun 1, 2022 at 5:37 PM Andy Shevchenko
> <andriy.shevchenko@linux.intel.com> wrote:
> >
> > Since recently, the kernel is nagging about mutable irq_chips:
> >
> >    "not an immutable chip, please consider fixing it!"
> >
> > Drop the unneeded copy, flag it as IRQCHIP_IMMUTABLE, add the new
> > helper functions and call the appropriate gpiolib functions.

> Reviewed-by: Bartosz Golaszewski <brgl@bgdev.pl>

Thanks!

I think I will collect all of these and send a PR after v5.19-rc1
to be included into v5.19-rc2+. Tell me if you think differently.