linux-kernel - [PATCH AUTOSEL 5.15 16/27] vhost_vdpa: don't setup irq offloading when irq

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Message-Id: <20220407011257.114287-16-sashal@kernel.org>
Date:   Wed,  6 Apr 2022 21:12:46 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zhu Lingshan <lingshan.zhu@...el.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Sasha Levin <sashal@...nel.org>, jasowang@...hat.com,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 16/27] vhost_vdpa: don't setup irq offloading when irq_num < 0

From: Zhu Lingshan <lingshan.zhu@...el.com>

[ Upstream commit cce0ab2b2a39072d81f98017f7b076f3410ef740 ]

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>
Link: https://lore.kernel.org/r/20220222115428.998334-3-lingshan.zhu@intel.com
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/vhost/vdpa.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index d62f05d056b7..299a99532618 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -97,8 +97,11 @@ static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)
 		return;
 
 	irq = ops->get_vq_irq(vdpa, qid);
+	if (irq < 0)
+		return;
+
 	irq_bypass_unregister_producer(&vq->call_ctx.producer);
-	if (!vq->call_ctx.ctx || irq < 0)
+	if (!vq->call_ctx.ctx)
 		return;
 
 	vq->call_ctx.producer.token = vq->call_ctx.ctx;
-- 
2.35.1