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genirq/manage: Rework irq_update_affinity_desc() 

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/20250429065421.830357569@linutronix.de
pull/1250/head
Thomas Gleixner 2025-04-29 08:55:32 +02:00
parent 17c1953567
commit b0561582ea
1 changed files with 31 additions and 43 deletions
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34
kernel/irq/manage.c
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@ -395,14 +395,8 @@ int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask,
* an interrupt which is already started or which has already been configured
* as managed will also fail, as these mean invalid init state or double init.
*/
int irq_update_affinity_desc(unsigned int irq,
struct irq_affinity_desc *affinity)
int irq_update_affinity_desc(unsigned int irq, struct irq_affinity_desc *affinity)
{
struct irq_desc *desc;
unsigned long flags;
bool activated;
int ret = 0;
/*
* Supporting this with the reservation scheme used by x86 needs
* some more thought. Fail it for now.
@ -410,22 +404,17 @@ int irq_update_affinity_desc(unsigned int irq,
if (IS_ENABLED(CONFIG_GENERIC_IRQ_RESERVATION_MODE))
return -EOPNOTSUPP;
desc = irq_get_desc_buslock(irq, &flags, 0);
if (!desc)
return -EINVAL;
scoped_irqdesc_get_and_buslock(irq, 0) {
struct irq_desc *desc = scoped_irqdesc;
bool activated;
/* Requires the interrupt to be shut down */
if (irqd_is_started(&desc->irq_data)) {
ret = -EBUSY;
goto out_unlock;
}
if (irqd_is_started(&desc->irq_data))
return -EBUSY;
/* Interrupts which are already managed cannot be modified */
if (irqd_affinity_is_managed(&desc->irq_data)) {
ret = -EBUSY;
goto out_unlock;
}
if (irqd_affinity_is_managed(&desc->irq_data))
return -EBUSY;
/*
* Deactivate the interrupt. That's required to undo
* anything an earlier activation has established.
@ -444,10 +433,9 @@ int irq_update_affinity_desc(unsigned int irq,
/* Restore the activation state */
if (activated)
irq_domain_activate_irq(&desc->irq_data, false);
out_unlock:
irq_put_desc_busunlock(desc, flags);
return ret;
return 0;
}
return -EINVAL;
}
static int __irq_set_affinity(unsigned int irq, const struct cpumask *mask,