linux-kernel - Re: [net-next RFC 3/8] macvtap: introduce macvtap_get

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Message-ID: <519E318B.2010804@cogentembedded.com>
Date:	Thu, 23 May 2013 19:11:07 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Jason Wang <jasowang@...hat.com>
CC:	davem@...emloft.net, mst@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [net-next RFC 3/8] macvtap: introduce macvtap_get_vlan()

Hello.

On 23-05-2013 7:12, Jason Wang wrote:

> Factor out the device holding logic to a macvtap_get_vlan(), this will be also
> used by multiqueue API.

> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>   drivers/net/macvtap.c |   26 +++++++++++++++++++-------
>   1 files changed, 19 insertions(+), 7 deletions(-)

> diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
> index ce1c72a..a36e49e 100644
> --- a/drivers/net/macvtap.c
> +++ b/drivers/net/macvtap.c
> @@ -890,6 +890,23 @@ out:
>   	return ret;
>   }
>
> +static struct macvlan_dev *macvtap_get_vlan(struct macvtap_queue *q)
> +{
> +	struct macvlan_dev *vlan;

    Empty line wouldn't hurt here, after declaration.

> +	rcu_read_lock_bh();
> +	vlan = rcu_dereference_bh(q->vlan);
> +	if (vlan)
> +		dev_hold(vlan->dev);
> +	rcu_read_unlock_bh();
> +
> +	return vlan;
> +}
[...]

WBR, Sergei

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