Re: [PATCH v1 1/1] gpio: sch: make irq_chip immutable
From: Bartosz Golaszewski
Date: Wed Jun 01 2022 - 13:19:39 EST
On Wed, Jun 1, 2022 at 5:37 PM Andy Shevchenko
<andriy.shevchenko@xxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx>
> ---
> 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@xxxxxxxx>