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gpiolib: irqchip: use irq_find_mapping while removing irqchip

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There is no guarantee that VIRQs will be allocated sequentially
for gpio irqchip in gpiochip_irqchip_add().
Therefore, it's unsafe to dispose VIRQ in gpiochip_irqchip_remove()
basing on index relatively to stored irq_base value.

Hence, use irq_find_mapping for VIRQ finding  in gpiochip_irqchip_remove()
instead of irq_base + index.

Reported-by: Wang, Yalin <Yalin.Wang@sonymobile.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Grygorii Strashko 2014-09-25 19:09:23 +03:00 committed by Linus Walleij
parent dcdc3018d6
commit e3893386b9
1 changed files with 2 additions and 1 deletions
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3
drivers/gpio/gpiolib.c
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@ -514,7 +514,8 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
/* 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_dispose_mapping(
irq_find_mapping(gpiochip->irqdomain, offset));
irq_domain_remove(gpiochip->irqdomain);
}