Re: [dpdk-stable] [Suspected-Phishing][PATCH] net/vhost: fix redundant queue state event

[Noa Ezra <noae@mellanox.com>]

Hi,
What do you think about this patch?

Thanks,
Noa.

> -----Original Message-----
> From: Noa Ezra [mailto:noae@mellanox.com]
> Sent: Wednesday, June 19, 2019 9:16 AM
> To: maxime.coquelin@redhat.com
> Cc: Matan Azrad <matan@mellanox.com>; dev@dpdk.org; Noa Ezra
> <noae@mellanox.com>; stable@dpdk.org
> Subject: [Suspected-Phishing][PATCH] net/vhost: fix redundant queue state
> event
> 
> In some situations, when a virtual machine is starting, vring_state_changed
> can be called while there was no change in the queue state. This fix makes
> sure that there was really a change in the queue state before calling the
> callback for EVENT_QUEUE_STATE.
> 
> Fixes: ee584e9710b9 ("vhost: add driver on top of the library")
> Cc: stable@dpdk.org
> Reviewed-by: Matan Azrad <matan@mellanox.com>
> ---
>  drivers/net/vhost/rte_eth_vhost.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/vhost/rte_eth_vhost.c
> b/drivers/net/vhost/rte_eth_vhost.c
> index cad1e5c..fbe7a37 100644
> --- a/drivers/net/vhost/rte_eth_vhost.c
> +++ b/drivers/net/vhost/rte_eth_vhost.c
> @@ -855,6 +855,10 @@ struct vhost_xstats_name_off {
>  	/* won't be NULL */
>  	state = vring_states[eth_dev->data->port_id];
>  	rte_spinlock_lock(&state->lock);
> +	if (state->cur[vring] == enable) {
> +		rte_spinlock_unlock(&state->lock);
> +		return 0;
> +	}
> 
>  	state->cur[vring] = enable;
>  	state->max_vring = RTE_MAX(vring, state->max_vring);
> --
> 1.8.3.1