Subject: [PATCH V2 3/4] vhost_vdpa: don't setup irq offloading when irq_num < 0

From: Zhu Lingshan <[email-masked]>
Date: Tue, 25 Jan 2022 17:17:43 +0800

When irq number is negative(e.g., -EINVAL), the virtqueue
may be disabled or the virtqueues are sharing a device irq.
In such case, we should not setup irq offloading for a virtqueue.

Signed-off-by: Zhu Lingshan <[email-masked]>
---
 drivers/vhost/vdpa.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 851539807bc9..909891d518e8 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -96,6 +96,9 @@ static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)
 	if (!ops->get_vq_irq)
 		return;
 
+	if (irq < 0)
+		return;
+
 	irq = ops->get_vq_irq(vdpa, qid);
 	irq_bypass_unregister_producer(&vq->call_ctx.producer);
 	if (!vq->call_ctx.ctx || irq < 0)
-- 
2.27.0