netdev - Re: [PATCH net-next v3 2/4] net: vhost: replace magic number of lock annotation

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Date:   Mon, 2 Jul 2018 10:21:37 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     xiangxia.m.yue@...il.com
Cc:     mst@...hat.com, makita.toshiaki@....ntt.co.jp,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        Tonghao Zhang <zhangtonghao@...ichuxing.com>
Subject: Re: [PATCH net-next v3 2/4] net: vhost: replace magic number of lock
 annotation



On 2018年06月30日 14:33, xiangxia.m.yue@...il.com wrote:
> From: Tonghao Zhang <xiangxia.m.yue@...il.com>
>
> Use the VHOST_NET_VQ_XXX as a subclass for mutex_lock_nested.
>
> Signed-off-by: Tonghao Zhang <zhangtonghao@...ichuxing.com>
> ---
>   drivers/vhost/net.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
> index e7cf7d2..62bb8e8 100644
> --- a/drivers/vhost/net.c
> +++ b/drivers/vhost/net.c
> @@ -484,7 +484,7 @@ static void handle_tx(struct vhost_net *net)
>   	bool zcopy, zcopy_used;
>   	int sent_pkts = 0;
>   
> -	mutex_lock(&vq->mutex);
> +	mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_TX);
>   	sock = vq->private_data;
>   	if (!sock)
>   		goto out;
> @@ -655,7 +655,7 @@ static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk)
>   		/* Flush batched heads first */
>   		vhost_rx_signal_used(rvq);
>   		/* Both tx vq and rx socket were polled here */
> -		mutex_lock_nested(&vq->mutex, 1);
> +		mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_TX);
>   		vhost_disable_notify(&net->dev, vq);
>   
>   		preempt_disable();
> @@ -789,7 +789,7 @@ static void handle_rx(struct vhost_net *net)
>   	__virtio16 num_buffers;
>   	int recv_pkts = 0;
>   
> -	mutex_lock_nested(&vq->mutex, 0);
> +	mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_RX);
>   	sock = vq->private_data;
>   	if (!sock)
>   		goto out;

Acked-by: Jason Wang <jasowang@...hat.com>