[PATCH 5.19 35/38] gpio: 104-dio-48e: Make irq_chip immutable

Greg Kroah-Hartman
2022-09-16T10:27:33Z

From: William Breathitt Gray <william.gray@linaro.org>

[ Upstream commit 35f0aa7727b092520bf91374768a4fdafd4a4fe3 ]

Kernel warns about mutable irq_chips:

"not an immutable chip, please consider fixing!"

Make the struct irq_chip const, flag it as IRQCHIP_IMMUTABLE, add the
new helper functions, and call the appropriate gpiolib functions.

Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpio/gpio-104-dio-48e.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-104-dio-48e.c b/drivers/gpio/gpio-104-dio-48e.c
index f118ad9bcd33d..0e95351d47d49 100644
--- a/drivers/gpio/gpio-104-dio-48e.c
+++ b/drivers/gpio/gpio-104-dio-48e.c
@@ -271,6 +271,7 @@ static void dio48e_irq_mask(struct irq_data *data)
dio48egpio->irq_mask &= ~BIT(0);
else
dio48egpio->irq_mask &= ~BIT(1);
+ gpiochip_disable_irq(chip, offset);

if (!dio48egpio->irq_mask)
/* disable interrupts */
@@ -298,6 +299,7 @@ static void dio48e_irq_unmask(struct irq_data *data)
iowrite8(0x00, dio48egpio->base + 0xB);
}

+ gpiochip_enable_irq(chip, offset);
if (offset == 19)
dio48egpio->irq_mask |= BIT(0);
else
@@ -320,12 +322,14 @@ static int dio48e_irq_set_type(struct irq_data *data, unsigned int flow_type)
return 0;
}

-static struct irq_chip dio48e_irqchip = {
+static const struct irq_chip dio48e_irqchip = {
.name = "104-dio-48e",
.irq_ack = dio48e_irq_ack,
.irq_mask = dio48e_irq_mask,
.irq_unmask = dio48e_irq_unmask,
- .irq_set_type = dio48e_irq_set_type
+ .irq_set_type = dio48e_irq_set_type,
+ .flags = IRQCHIP_IMMUTABLE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
};

static irqreturn_t dio48e_irq_handler(int irq, void *dev_id)
@@ -414,7 +418,7 @@ static int dio48e_probe(struct device *dev, unsigned int id)
dio48egpio->chip.set_multiple = dio48e_gpio_set_multiple;

girq = &dio48egpio->chip.irq;
- girq->chip = &dio48e_irqchip;
+ gpio_irq_chip_set_chip(girq, &dio48e_irqchip);
/* This will let us handle the parent IRQ in the driver */
girq->parent_handler = NULL;
girq->num_parents = 0;
--
2.35.1