[PATCH] x86/ioapic: Do not unmask io_apic when interrupt is in progress

From: Sebastian Andrzej Siewior
Date: Fri Mar 02 2018 - 08:04:47 EST


From: Ingo Molnar <mingo@xxxxxxx>
Date: Fri, 3 Jul 2009 08:29:27 -0500

With threaded interrupts we might see an interrupt in progress on
migration. Do not unmask it when this is the case.

Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
arch/x86/kernel/apic/io_apic.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1690,7 +1690,8 @@ static bool io_apic_level_ack_pending(st
static inline bool ioapic_irqd_mask(struct irq_data *data)
{
/* If we are moving the irq we need to mask it */
- if (unlikely(irqd_is_setaffinity_pending(data))) {
+ if (unlikely(irqd_is_setaffinity_pending(data) &&
+ !irqd_irq_inprogress(data))) {
mask_ioapic_irq(data);
return true;
}