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gpio: put GPIO IRQs into their own lock class

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Another feature that is duplicated in a number of GPIO irqchips
is that these cascades IRQs are assigned their own lock class
so as to avoid warnings about lockdep recursions. Do this also
in the generic GPIO irqchip helpers for smooth transition to
this core infrastructure.

Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2014-04-22 14:01:46 +02:00
parent 1e0d982317
commit e45d1c80c0
1 changed files with 7 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

7
drivers/gpio/gpiolib.c
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@ -1377,6 +1377,12 @@ void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
}
EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip);
/*
* This lock class tells lockdep that GPIO irqs are in a different
* category than their parents, so it won't report false recursion.
*/
static struct lock_class_key gpiochip_irq_lock_class;
/**
* gpiochip_irq_map() - maps an IRQ into a GPIO irqchip
* @d: the irqdomain used by this irqchip
@ -1393,6 +1399,7 @@ static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
struct gpio_chip *chip = d->host_data;
irq_set_chip_data(irq, chip);
irq_set_lockdep_class(irq, &gpiochip_irq_lock_class);
irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler);
/* Chips that can sleep need nested thread handlers */
if (chip->can_sleep)