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

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Date:   Fri, 2 Mar 2018 14:04:36 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     x86@...nel.org
Subject: [PATCH] x86/ioapic: Do not unmask io_apic when interrupt is in
 progress

From: Ingo Molnar <mingo@...e.hu>
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@...e.hu>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 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;
 	}