Commit 2db87321 authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Linus Torvalds
Browse files

set_irq_wake: fix return code and wake status tracking 



Since 15a647eb set_irq_wake returned -ENXIO
if another device had it already enabled.  Zero is the right value to
return in this case.  Moreover the change to desc->status was not reverted
if desc->chip->set_wake returned an error.

Signed-off-by: default avatarUwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Acked-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Andrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1bad879a

kernel/irq/manage.c

+27 −12
Original line number Diff line number Diff line
@@ -217,6 +217,17 @@ void enable_irq(unsigned int irq) 
}

EXPORT_SYMBOL(enable_irq);



int set_irq_wake_real(unsigned int irq, unsigned int on)

{

	struct irq_desc *desc = irq_desc + irq;

	int ret = -ENXIO;



	if (desc->chip->set_wake)

		ret = desc->chip->set_wake(irq, on);



	return ret;

}



/**

 *	set_irq_wake - control irq power management wakeup

 *	@irq:	interrupt to control
@@ -233,30 +244,34 @@ int set_irq_wake(unsigned int irq, unsigned int on) 
{

	struct irq_desc *desc = irq_desc + irq;

	unsigned long flags;

	int ret = -ENXIO;

	int (*set_wake)(unsigned, unsigned) = desc->chip->set_wake;

	int ret = 0;



	/* wakeup-capable irqs can be shared between drivers that

	 * don't need to have the same sleep mode behaviors.

	 */

	spin_lock_irqsave(&desc->lock, flags);

	if (on) {

		if (desc->wake_depth++ == 0)

			desc->status |= IRQ_WAKEUP;

		if (desc->wake_depth++ == 0) {

			ret = set_irq_wake_real(irq, on);

			if (ret)

				desc->wake_depth = 0;

			else

			set_wake = NULL;

				desc->status |= IRQ_WAKEUP;

		}

	} else {

		if (desc->wake_depth == 0) {

			printk(KERN_WARNING "Unbalanced IRQ %d "

					"wake disable\n", irq);

			WARN_ON(1);

		} else if (--desc->wake_depth == 0)

			desc->status &= ~IRQ_WAKEUP;

		} else if (--desc->wake_depth == 0) {

			ret = set_irq_wake_real(irq, on);

			if (ret)

				desc->wake_depth = 1;

			else

			set_wake = NULL;

				desc->status &= ~IRQ_WAKEUP;

		}

	if (set_wake)

		ret = desc->chip->set_wake(irq, on);

	}



	spin_unlock_irqrestore(&desc->lock, flags);

	return ret;

}

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