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set_irq_wake: fix return code and wake status tracking

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Since 15a647eba9 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: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Acked-by: David 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: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Uwe Kleine-König 2008-07-23 14:42:25 +02:00 committed by Linus Torvalds
parent 1bad879a07
commit 2db873211b
1 changed files with 27 additions and 12 deletions
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39
kernel/irq/manage.c
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@ -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;
else
set_wake = NULL;
if (desc->wake_depth++ == 0) {
ret = set_irq_wake_real(irq, on);
if (ret)
desc->wake_depth = 0;
else
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
set_wake = NULL;
} else if (--desc->wake_depth == 0) {
ret = set_irq_wake_real(irq, on);
if (ret)
desc->wake_depth = 1;
else
desc->status &= ~IRQ_WAKEUP;
}
}
if (set_wake)
ret = desc->chip->set_wake(irq, on);
spin_unlock_irqrestore(&desc->lock, flags);
return ret;
}