Linux Virtualization - May 2021 - [PATCH 1/1] virtio-net: don't allocate control_buf if not supported

? 2021/5/2 ??5:33, Max Gurtovoy ??:
> Not all virtio_net devices support the ctrl queue feature. Thus, there
> is no need to allocate unused resources.
>
> Signed-off-by: Max Gurtovoy <mgurtovoy at nvidia.com>

Acked-by: Jason Wang <jasowang at redhat.com>

> ---
>   drivers/net/virtio_net.c | 10 +++++++---
>   1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 7fda2ae4c40f..9b6a4a875c55 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2870,9 +2870,13 @@ static int virtnet_alloc_queues(struct virtnet_info
*vi)
>   {
>   	int i;
>   
> -	vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
> -	if (!vi->ctrl)
> -		goto err_ctrl;
> +	if (vi->has_cvq) {
> +		vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
> +		if (!vi->ctrl)
> +			goto err_ctrl;
> +	} else {
> +		vi->ctrl = NULL;
> +	}
>   	vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq),
GFP_KERNEL);
>   	if (!vi->sq)
>   		goto err_sq;