linux-kernel - [PATCH v5 5/8] vdpa: min vq num of vdpa device cannot be greater than max vq num

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Date:   Fri, 15 Oct 2021 15:14:58 +0800
From:   Wu Zongyong <wuzongyong@...ux.alibaba.com>
To:     wuzongyong@...ux.alibaba.com, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, mst@...hat.com
Cc:     wei.yang1@...ux.alibaba.com
Subject: [PATCH v5 5/8] vdpa: min vq num of vdpa device cannot be greater than max vq num

Just failed to probe the vdpa device if the min virtqueue num returned
by get_vq_num_min is greater than the max virtqueue num returned by
get_vq_num_max.

Signed-off-by: Wu Zongyong <wuzongyong@...ux.alibaba.com>
---
 drivers/vdpa/vdpa.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 1dc121a07a93..fd014ecec711 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -26,8 +26,16 @@ static int vdpa_dev_probe(struct device *d)
 {
 	struct vdpa_device *vdev = dev_to_vdpa(d);
 	struct vdpa_driver *drv = drv_to_vdpa(vdev->dev.driver);
+	const struct vdpa_config_ops *ops = vdev->config;
+	u32 max_num, min_num = 0;
 	int ret = 0;
 
+	max_num = ops->get_vq_num_max(vdev);
+	if (ops->get_vq_num_min)
+		min_num = ops->get_vq_num_min(vdev);
+	if (max_num < min_num)
+		return -EINVAL;
+
 	if (drv && drv->probe)
 		ret = drv->probe(vdev);
 
-- 
2.31.1