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[ARM] 4848/1: at91: remove false lockdep warnings

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Remove false lockdep warnings about lock recursion when declaring
IRQs as being wake-capable, by marking putting GPIO irq_desc locks
into their own class.

(Thanks to Peter Zijlstra for helping track down such a small
fix to this problem.)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
David Brownell 2008-03-05 00:08:29 +01:00 committed by Russell King
parent b24061fadc
commit 37aca70c62
1 changed files with 7 additions and 0 deletions
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arch/arm/mach-at91/gpio.c
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@ -490,6 +490,11 @@ postcore_initcall(at91_gpio_debugfs_init);
/*--------------------------------------------------------------------------*/ /*--------------------------------------------------------------------------*/
/* 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 gpio_lock_class;
/* /*
* Called from the processor-specific init to enable GPIO interrupt support. * Called from the processor-specific init to enable GPIO interrupt support.
*/ */
@ -510,6 +515,8 @@ void __init at91_gpio_irq_setup(void)
__raw_writel(~0, this->regbase + PIO_IDR); __raw_writel(~0, this->regbase + PIO_IDR);
for (i = 0, pin = this->chipbase; i < 32; i++, pin++) { for (i = 0, pin = this->chipbase; i < 32; i++, pin++) {
lockdep_set_class(&irq_desc[pin].lock, &gpio_lock_class);
/* /*
* Can use the "simple" and not "edge" handler since it's * Can use the "simple" and not "edge" handler since it's
* shorter, and the AIC handles interrupts sanely. * shorter, and the AIC handles interrupts sanely.