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genirq/manage: Rework irq_set_irq_wake()

Browse source 
Use the new guards to get and lock the interrupt descriptor and tidy up the
code.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/87ldrhq0hc.ffs@tglx
This commit is contained in:
Thomas Gleixner 2025-04-30 14:48:15 +02:00
parent bddd10c554
commit 8589e325ba
1 changed files with 30 additions and 35 deletions
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65
kernel/irq/manage.c
View file

@ -846,45 +846,40 @@ static int set_irq_wake_real(unsigned int irq, unsigned int on)
*/
int irq_set_irq_wake(unsigned int irq, unsigned int on)
{
unsigned long flags;
struct irq_desc *desc = irq_get_desc_buslock(irq, &flags, IRQ_GET_DESC_CHECK_GLOBAL);
int ret = 0;
scoped_irqdesc_get_and_lock(irq, IRQ_GET_DESC_CHECK_GLOBAL) {
struct irq_desc *desc = scoped_irqdesc;
int ret = 0;
if (!desc)
return -EINVAL;
/* Don't use NMIs as wake up interrupts please */
if (irq_is_nmi(desc))
return -EINVAL;
/* Don't use NMIs as wake up interrupts please */
if (irq_is_nmi(desc)) {
ret = -EINVAL;
goto out_unlock;
}
/* wakeup-capable irqs can be shared between drivers that
* don't need to have the same sleep mode behaviors.
*/
if (on) {
if (desc->wake_depth++ == 0) {
ret = set_irq_wake_real(irq, on);
if (ret)
desc->wake_depth = 0;
else
irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE);
}
} else {
if (desc->wake_depth == 0) {
WARN(1, "Unbalanced IRQ %d wake disable\n", irq);
} else if (--desc->wake_depth == 0) {
ret = set_irq_wake_real(irq, on);
if (ret)
desc->wake_depth = 1;
else
irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE);
/*
* wakeup-capable irqs can be shared between drivers that
* don't need to have the same sleep mode behaviors.
*/
if (on) {
if (desc->wake_depth++ == 0) {
ret = set_irq_wake_real(irq, on);
if (ret)
desc->wake_depth = 0;
else
irqd_set(&desc->irq_data, IRQD_WAKEUP_STATE);
}
} else {
if (desc->wake_depth == 0) {
WARN(1, "Unbalanced IRQ %d wake disable\n", irq);
} else if (--desc->wake_depth == 0) {
ret = set_irq_wake_real(irq, on);
if (ret)
desc->wake_depth = 1;
else
irqd_clear(&desc->irq_data, IRQD_WAKEUP_STATE);
}
}
return ret;
}
out_unlock:
irq_put_desc_busunlock(desc, flags);
return ret;
return -EINVAL;
}
EXPORT_SYMBOL(irq_set_irq_wake);