static int vdpa_nl_cmd_dev_config_get_doit()

in vdpa.c [912:952]

• 38 lines of code
• 7 McCabe index (conditional complexity)

static int vdpa_nl_cmd_dev_config_get_doit(struct sk_buff *skb, struct genl_info *info)
{
	struct vdpa_device *vdev;
	struct sk_buff *msg;
	const char *devname;
	struct device *dev;
	int err;

	if (!info->attrs[VDPA_ATTR_DEV_NAME])
		return -EINVAL;
	devname = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);
	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	mutex_lock(&vdpa_dev_mutex);
	dev = bus_find_device(&vdpa_bus, NULL, devname, vdpa_name_match);
	if (!dev) {
		NL_SET_ERR_MSG_MOD(info->extack, "device not found");
		err = -ENODEV;
		goto dev_err;
	}
	vdev = container_of(dev, struct vdpa_device, dev);
	if (!vdev->mdev) {
		NL_SET_ERR_MSG_MOD(info->extack, "unmanaged vdpa device");
		err = -EINVAL;
		goto mdev_err;
	}
	err = vdpa_dev_config_fill(vdev, msg, info->snd_portid, info->snd_seq,
				   0, info->extack);
	if (!err)
		err = genlmsg_reply(msg, info);

mdev_err:
	put_device(dev);
dev_err:
	mutex_unlock(&vdpa_dev_mutex);
	if (err)
		nlmsg_free(msg);
	return err;
}