[PATCH 0/4] Make irq_chip immutable for ISA drivers

[PATCH 0/4] Make irq_chip immutable for ISA drivers

[William Breathitt Gray]

Kernel warns about mutable irq_chips in ISA drivers:

    "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.

William Breathitt Gray (4):
  gpio: 104-dio-48e: Make irq_chip immutable
  gpio: 104-idi-48: Make irq_chip immutable
  gpio: 104-idio-16: Make irq_chip immutable
  gpio: ws16c48: Make irq_chip immutable

 drivers/gpio/gpio-104-dio-48e.c | 10 +++++++---
 drivers/gpio/gpio-104-idi-48.c  | 10 +++++++---
 drivers/gpio/gpio-104-idio-16.c | 18 +++++++++++-------
 drivers/gpio/gpio-ws16c48.c     | 10 +++++++---
 4 files changed, 32 insertions(+), 16 deletions(-)


base-commit: 6ae8e1d0d5e5de922315830aea975c63e8c70b2f
-- 
2.37.2

[PATCH 1/4] gpio: 104-dio-48e: Make irq_chip immutable

[William Breathitt Gray]

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>
---
 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 a41551870759..74cc71bb3984 100644
--- a/drivers/gpio/gpio-104-dio-48e.c
+++ b/drivers/gpio/gpio-104-dio-48e.c
@@ -164,6 +164,7 @@ 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 */
@@ -191,6 +192,7 @@ static void dio48e_irq_unmask(struct irq_data *data)
 		iowrite8(0x00, &dio48egpio->reg->enable_interrupt);
 	}
 
+	gpiochip_enable_irq(chip, offset);
 	if (offset == 19)
 		dio48egpio->irq_mask |= BIT(0);
 	else
@@ -213,12 +215,14 @@ 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)
@@ -322,7 +326,7 @@ 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;
-- 
2.37.2

[PATCH 2/4] gpio: 104-idi-48: Make irq_chip immutable

[William Breathitt Gray]

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>
---
 drivers/gpio/gpio-104-idi-48.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c
index 40be76efeed7..3286b914a2cf 100644
--- a/drivers/gpio/gpio-104-idi-48.c
+++ b/drivers/gpio/gpio-104-idi-48.c
@@ -113,6 +113,7 @@ static void idi_48_irq_mask(struct irq_data *data)
 	spin_lock_irqsave(&idi48gpio->lock, flags);
 
 	idi48gpio->irq_mask[boundary] &= ~mask;
+	gpiochip_disable_irq(chip, offset);
 
 	/* Exit early if there are still input lines with IRQ unmasked */
 	if (idi48gpio->irq_mask[boundary])
@@ -140,6 +141,7 @@ static void idi_48_irq_unmask(struct irq_data *data)
 
 	prev_irq_mask = idi48gpio->irq_mask[boundary];
 
+	gpiochip_enable_irq(chip, offset);
 	idi48gpio->irq_mask[boundary] |= mask;
 
 	/* Exit early if IRQ was already unmasked for this boundary */
@@ -164,12 +166,14 @@ static int idi_48_irq_set_type(struct irq_data *data, unsigned int flow_type)
 	return 0;
 }
 
-static struct irq_chip idi_48_irqchip = {
+static const struct irq_chip idi_48_irqchip = {
 	.name = "104-idi-48",
 	.irq_ack = idi_48_irq_ack,
 	.irq_mask = idi_48_irq_mask,
 	.irq_unmask = idi_48_irq_unmask,
-	.irq_set_type = idi_48_irq_set_type
+	.irq_set_type = idi_48_irq_set_type,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static irqreturn_t idi_48_irq_handler(int irq, void *dev_id)
@@ -267,7 +271,7 @@ static int idi_48_probe(struct device *dev, unsigned int id)
 	idi48gpio->chip.get_multiple = idi_48_gpio_get_multiple;
 
 	girq = &idi48gpio->chip.irq;
-	girq->chip = &idi_48_irqchip;
+	gpio_irq_chip_set_chip(girq, &idi_48_irqchip);
 	/* This will let us handle the parent IRQ in the driver */
 	girq->parent_handler = NULL;
 	girq->num_parents = 0;
-- 
2.37.2

[PATCH 3/4] gpio: 104-idio-16: Make irq_chip immutable

[William Breathitt Gray]

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>
---
 drivers/gpio/gpio-104-idio-16.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c
index 65a5f581d981..4756e583f223 100644
--- a/drivers/gpio/gpio-104-idio-16.c
+++ b/drivers/gpio/gpio-104-idio-16.c
@@ -174,10 +174,11 @@ static void idio_16_irq_mask(struct irq_data *data)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-	const unsigned long mask = BIT(irqd_to_hwirq(data));
+	const unsigned long offset = irqd_to_hwirq(data);
 	unsigned long flags;
 
-	idio16gpio->irq_mask &= ~mask;
+	idio16gpio->irq_mask &= ~BIT(offset);
+	gpiochip_disable_irq(chip, offset);
 
 	if (!idio16gpio->irq_mask) {
 		raw_spin_lock_irqsave(&idio16gpio->lock, flags);
@@ -192,11 +193,12 @@ static void idio_16_irq_unmask(struct irq_data *data)
 {
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
 	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-	const unsigned long mask = BIT(irqd_to_hwirq(data));
+	const unsigned long offset = irqd_to_hwirq(data);
 	const unsigned long prev_irq_mask = idio16gpio->irq_mask;
 	unsigned long flags;
 
-	idio16gpio->irq_mask |= mask;
+	gpiochip_enable_irq(chip, offset);
+	idio16gpio->irq_mask |= BIT(offset);
 
 	if (!prev_irq_mask) {
 		raw_spin_lock_irqsave(&idio16gpio->lock, flags);
@@ -217,12 +219,14 @@ static int idio_16_irq_set_type(struct irq_data *data, unsigned int flow_type)
 	return 0;
 }
 
-static struct irq_chip idio_16_irqchip = {
+static const struct irq_chip idio_16_irqchip = {
 	.name = "104-idio-16",
 	.irq_ack = idio_16_irq_ack,
 	.irq_mask = idio_16_irq_mask,
 	.irq_unmask = idio_16_irq_unmask,
-	.irq_set_type = idio_16_irq_set_type
+	.irq_set_type = idio_16_irq_set_type,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static irqreturn_t idio_16_irq_handler(int irq, void *dev_id)
@@ -299,7 +303,7 @@ static int idio_16_probe(struct device *dev, unsigned int id)
 	idio16gpio->out_state = 0xFFFF;
 
 	girq = &idio16gpio->chip.irq;
-	girq->chip = &idio_16_irqchip;
+	gpio_irq_chip_set_chip(girq, &idio_16_irqchip);
 	/* This will let us handle the parent IRQ in the driver */
 	girq->parent_handler = NULL;
 	girq->num_parents = 0;
-- 
2.37.2

[PATCH 4/4] gpio: ws16c48: Make irq_chip immutable

[William Breathitt Gray]

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>
---
 drivers/gpio/gpio-ws16c48.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-ws16c48.c b/drivers/gpio/gpio-ws16c48.c
index b098f2dc196b..59fb10641598 100644
--- a/drivers/gpio/gpio-ws16c48.c
+++ b/drivers/gpio/gpio-ws16c48.c
@@ -265,6 +265,7 @@ static void ws16c48_irq_mask(struct irq_data *data)
 	raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
 
 	ws16c48gpio->irq_mask &= ~mask;
+	gpiochip_disable_irq(chip, offset);
 	port_state = ws16c48gpio->irq_mask >> (8 * port);
 
 	/* Select Register Page 2; Unlock all I/O ports */
@@ -295,6 +296,7 @@ static void ws16c48_irq_unmask(struct irq_data *data)
 
 	raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);
 
+	gpiochip_enable_irq(chip, offset);
 	ws16c48gpio->irq_mask |= mask;
 	port_state = ws16c48gpio->irq_mask >> (8 * port);
 
@@ -356,12 +358,14 @@ static int ws16c48_irq_set_type(struct irq_data *data, unsigned flow_type)
 	return 0;
 }
 
-static struct irq_chip ws16c48_irqchip = {
+static const struct irq_chip ws16c48_irqchip = {
 	.name = "ws16c48",
 	.irq_ack = ws16c48_irq_ack,
 	.irq_mask = ws16c48_irq_mask,
 	.irq_unmask = ws16c48_irq_unmask,
-	.irq_set_type = ws16c48_irq_set_type
+	.irq_set_type = ws16c48_irq_set_type,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static irqreturn_t ws16c48_irq_handler(int irq, void *dev_id)
@@ -463,7 +467,7 @@ static int ws16c48_probe(struct device *dev, unsigned int id)
 	ws16c48gpio->chip.set_multiple = ws16c48_gpio_set_multiple;
 
 	girq = &ws16c48gpio->chip.irq;
-	girq->chip = &ws16c48_irqchip;
+	gpio_irq_chip_set_chip(girq, &ws16c48_irqchip);
 	/* This will let us handle the parent IRQ in the driver */
 	girq->parent_handler = NULL;
 	girq->num_parents = 0;
-- 
2.37.2

Re: [PATCH 0/4] Make irq_chip immutable for ISA drivers

[Bartosz Golaszewski]

On Fri, Sep 2, 2022 at 11:40 PM William Breathitt Gray
<william.gray@linaro.org> wrote:
>
> Kernel warns about mutable irq_chips in ISA drivers:
>
>     "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.
>
> William Breathitt Gray (4):
>   gpio: 104-dio-48e: Make irq_chip immutable
>   gpio: 104-idi-48: Make irq_chip immutable
>   gpio: 104-idio-16: Make irq_chip immutable
>   gpio: ws16c48: Make irq_chip immutable
>
>  drivers/gpio/gpio-104-dio-48e.c | 10 +++++++---
>  drivers/gpio/gpio-104-idi-48.c  | 10 +++++++---
>  drivers/gpio/gpio-104-idio-16.c | 18 +++++++++++-------
>  drivers/gpio/gpio-ws16c48.c     | 10 +++++++---
>  4 files changed, 32 insertions(+), 16 deletions(-)
>
>
> base-commit: 6ae8e1d0d5e5de922315830aea975c63e8c70b2f
> --
> 2.37.2
>

Queued for fixes, thanks!

Bart