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gpio: unmap gpio irqs properly 

When using the irqchip helper inside the gpiolib, make sure
the IRQs are unmapped/disposed before the irqdomain is removed
as part of removing the gpiochip.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2014-03-28 20:42:01 +01:00
parent 2ddf6cd67c
commit c3626fdea0
2 changed files with 30 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
drivers/gpio/gpiolib.c
View File

@ -1399,8 +1399,18 @@ static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
return 0;
}
static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq)
{
#ifdef CONFIG_ARM
set_irq_flags(irq, 0);
#endif
irq_set_chip_and_handler(irq, NULL, NULL);
irq_set_chip_data(irq, NULL);
}
static const struct irq_domain_ops gpiochip_domain_ops = {
.map = gpiochip_irq_map,
.unmap = gpiochip_irq_unmap,
/* Virtually all GPIO irqchips are twocell:ed */
.xlate = irq_domain_xlate_twocell,
};
@ -1438,8 +1448,14 @@ static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset)
*/
static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
{
if (gpiochip->irqdomain)
unsigned int offset;
/* Remove all IRQ mappings and delete the domain */
if (gpiochip->irqdomain) {
for (offset = 0; offset < gpiochip->ngpio; offset++)
irq_dispose_mapping(gpiochip->irq_base + offset);
irq_domain_remove(gpiochip->irqdomain);
}
if (gpiochip->irqchip) {
gpiochip->irqchip->irq_request_resources = NULL;
@ -1467,7 +1483,8 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
* translation. The gpiochip will need to be initialized and registered
* before calling this function.
*
* This function will handle two cell:ed simple IRQs. Everything else
* This function will handle two cell:ed simple IRQs and assumes all
* the pins on the gpiochip can generate a unique IRQ. Everything else
* need to be open coded.
*/
int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
@ -1478,6 +1495,7 @@ int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
{
struct device_node *of_node;
unsigned int offset;
unsigned irq_base = 0;
if (!gpiochip || !irqchip)
return -EINVAL;
@ -1514,8 +1532,15 @@ int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
* any gpiochip calls. If the first_irq was zero, this is
* necessary to allocate descriptors for all IRQs.
*/
for (offset = 0; offset < gpiochip->ngpio; offset++)
irq_create_mapping(gpiochip->irqdomain, offset);
for (offset = 0; offset < gpiochip->ngpio; offset++) {
irq_base = irq_create_mapping(gpiochip->irqdomain, offset);
if (offset == 0)
/*
* Store the base into the gpiochip to be used when
* unmapping the irqs.
*/
gpiochip->irq_base = irq_base;
}
return 0;
}

1
include/linux/gpio/driver.h
View File

@ -107,6 +107,7 @@ struct gpio_chip {
*/
struct irq_chip *irqchip;
struct irq_domain *irqdomain;
unsigned int irq_base;
irq_flow_handler_t irq_handler;
unsigned int irq_default_type;
#endif