netdev - [PATCH V4 3/4] vhost_vdpa: don't setup irq offloading when irq

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Date:   Thu,  3 Feb 2022 15:27:34 +0800
From:   Zhu Lingshan <lingshan.zhu@...el.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        Zhu Lingshan <lingshan.zhu@...el.com>
Subject: [PATCH V4 3/4] vhost_vdpa: don't setup irq offloading when irq_num < 0

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 <lingshan.zhu@...el.com>
---
 drivers/vhost/vdpa.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 851539807bc9..c4fcacb0de3a 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -96,6 +96,10 @@ static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)
 	if (!ops->get_vq_irq)
 		return;
 
+	irq = ops->get_vq_irq(vdpa, qid);
+	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