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x86/apic/vector: Ignore set_affinity call for inactive interrupts

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The core interrupt code can call the affinity setter for inactive
interrupts under certain circumstances.

For inactive intererupts which use managed or reservation mode this is a
pointless exercise as the activation will assign a vector which fits the
destination mask.

Check for this and return w/o going through the vector assignment.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2017-10-12 11:05:28 +02:00
parent 331b57d148
commit 02edee152d
1 changed files with 13 additions and 0 deletions
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13
arch/x86/kernel/apic/vector.c
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@ -726,8 +726,21 @@ void lapic_offline(void)
static int apic_set_affinity(struct irq_data *irqd,
const struct cpumask *dest, bool force)
{
struct apic_chip_data *apicd = apic_chip_data(irqd);
int err;
/*
* Core code can call here for inactive interrupts. For inactive
* interrupts which use managed or reservation mode there is no
* point in going through the vector assignment right now as the
* activation will assign a vector which fits the destination
* cpumask. Let the core code store the destination mask and be
* done with it.
*/
if (!irqd_is_activated(irqd) &&
(apicd->is_managed || apicd->can_reserve))
return IRQ_SET_MASK_OK;
raw_spin_lock(&vector_lock);
cpumask_and(vector_searchmask, dest, cpu_online_mask);
if (irqd_affinity_is_managed(irqd))