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Date:   Mon, 19 Oct 2020 17:06:57 +0800
From:   Zhenzhong Duan <>
Cc:,,,,,,,,,,,, Zhenzhong Duan <>
Subject: [PATCH 2/2] KVM: not link irqfd with a fake IRQ bypass producer

In case failure to setup Post interrupt for an IRQ, it make no sense
to assign irqfd->producer to the producer.

This change makes code more robust.

Signed-off-by: Zhenzhong Duan <>
 arch/x86/kvm/x86.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ce856e0..277e961 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10683,13 +10683,14 @@ int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
 		container_of(cons, struct kvm_kernel_irqfd, consumer);
 	int ret;
-	irqfd->producer = prod;
 	ret = kvm_x86_ops.update_pi_irte(irqfd->kvm,
 					 prod->irq, irqfd->gsi, 1);
 	if (ret)
+	else
+		irqfd->producer = prod;
 	return ret;

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