[PATCH v8 15/35] pinctrl: airoha: fix getting gpiochip/pinctrl pointers in the IRQ handling code

[Mikhail Kshevetskiy]

airoha_irq_unmask(), airoha_irq_mask(), airoha_irq_type() functions
impements brain damaged logic to retrieve gpiochip and pinctrl pointers.

Details:

    gpiochip = irq_data_get_irq_chip_data(data);

will initialize gpiochip variable with data->chip_data value. This value
initialized inside gpiochip_irq_map() function

    static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
			        irq_hw_number_t hwirq)
    {
	struct gpio_chip *gc = d->host_data;
        ...
	irq_set_chip_data(irq, gc);
	...
    }

Thus gpiochip variable of 'struct airoha_pinctrl_gpiochip *' type will be
initialized with a pointer to a variable of 'struct gpio_chip' type.

Luckily, gpio_chip is the first element of airoha_pinctrl_gpiochip, so
gpiochip pointer will get a correct value.

This patch implements correct logic of getting gpiochip and pinctrl
pointers.

Fixes: 1c8ace2d0725 ("pinctrl: airoha: Add support for EN7581 SoC")
Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
---
 drivers/pinctrl/airoha/pinctrl-airoha.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/pinctrl/airoha/pinctrl-airoha.c b/drivers/pinctrl/airoha/pinctrl-airoha.c
index c432e9c13c207..a27a3188ca006 100644
--- a/drivers/pinctrl/airoha/pinctrl-airoha.c
+++ b/drivers/pinctrl/airoha/pinctrl-airoha.c
@@ -2564,18 +2564,17 @@ static int airoha_gpio_direction_output(struct gpio_chip *chip,
 /* irq callbacks */
 static void airoha_irq_unmask(struct irq_data *data)
 {
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+	struct airoha_pinctrl *pinctrl = gpiochip_get_data(gc);
+	struct airoha_pinctrl_gpiochip *gpiochip = &pinctrl->gpiochip;
 	u8 offset = data->hwirq % AIROHA_REG_GPIOCTRL_NUM_PIN;
 	u8 index = data->hwirq / AIROHA_REG_GPIOCTRL_NUM_PIN;
 	u32 mask = GENMASK(2 * offset + 1, 2 * offset);
-	struct airoha_pinctrl_gpiochip *gpiochip;
-	struct airoha_pinctrl *pinctrl;
 	u32 val = BIT(2 * offset);
 
-	gpiochip = irq_data_get_irq_chip_data(data);
 	if (WARN_ON_ONCE(data->hwirq >= ARRAY_SIZE(gpiochip->irq_type)))
 		return;
 
-	pinctrl = container_of(gpiochip, struct airoha_pinctrl, gpiochip);
 	switch (gpiochip->irq_type[data->hwirq]) {
 	case IRQ_TYPE_LEVEL_LOW:
 		val = val << 1;
@@ -2601,14 +2600,12 @@ static void airoha_irq_unmask(struct irq_data *data)
 
 static void airoha_irq_mask(struct irq_data *data)
 {
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+	struct airoha_pinctrl *pinctrl = gpiochip_get_data(gc);
+	struct airoha_pinctrl_gpiochip *gpiochip = &pinctrl->gpiochip;
 	u8 offset = data->hwirq % AIROHA_REG_GPIOCTRL_NUM_PIN;
 	u8 index = data->hwirq / AIROHA_REG_GPIOCTRL_NUM_PIN;
 	u32 mask = GENMASK(2 * offset + 1, 2 * offset);
-	struct airoha_pinctrl_gpiochip *gpiochip;
-	struct airoha_pinctrl *pinctrl;
-
-	gpiochip = irq_data_get_irq_chip_data(data);
-	pinctrl = container_of(gpiochip, struct airoha_pinctrl, gpiochip);
 
 	regmap_clear_bits(pinctrl->regmap, gpiochip->level[index], mask);
 	regmap_clear_bits(pinctrl->regmap, gpiochip->edge[index], mask);
@@ -2616,9 +2613,10 @@ static void airoha_irq_mask(struct irq_data *data)
 
 static int airoha_irq_type(struct irq_data *data, unsigned int type)
 {
-	struct airoha_pinctrl_gpiochip *gpiochip;
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+	struct airoha_pinctrl *pinctrl = gpiochip_get_data(gc);
+	struct airoha_pinctrl_gpiochip *gpiochip = &pinctrl->gpiochip;
 
-	gpiochip = irq_data_get_irq_chip_data(data);
 	if (data->hwirq >= ARRAY_SIZE(gpiochip->irq_type))
 		return -EINVAL;
 
-- 
2.53.0