netdev - Re: [PATCH net-next v2 4/6] rtnetlink: add helper to dump ifalias

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Date:   Sat, 23 Sep 2017 11:14:19 -0600
From:   David Ahern <dsahern@...il.com>
To:     Florian Westphal <fw@...len.de>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 4/6] rtnetlink: add helper to dump ifalias

On 9/22/17 12:10 AM, Florian Westphal wrote:
> ifalias is currently protected by rtnl mutex, add assertion
> as a reminder.
> 
> Signed-off-by: Florian Westphal <fw@...len.de>
> ---
>  net/core/rtnetlink.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index ad3f27da37a8..42ff582a010e 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -1345,6 +1345,16 @@ static int nla_put_qdisc(struct sk_buff *skb, struct net_device *dev)
>  	return ret;
>  }
>  
> +static noinline int nla_put_ifalias(struct sk_buff *skb, struct net_device *dev)
> +{
> +	ASSERT_RTNL();

The assert is not needed given the code path.

> +
> +	if (dev->ifalias)
> +		return nla_put_string(skb, IFLA_IFALIAS, dev->ifalias);
> +
> +	return 0;
> +}
> +
>  static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
>  			    int type, u32 pid, u32 seq, u32 change,
>  			    unsigned int flags, u32 ext_filter_mask,
> @@ -1386,8 +1396,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
>  	    put_master_ifindex(skb, dev) ||
>  	    nla_put_u8(skb, IFLA_CARRIER, netif_carrier_ok(dev)) ||
>  	    nla_put_qdisc(skb, dev) ||
> -	    (dev->ifalias &&
> -	     nla_put_string(skb, IFLA_IFALIAS, dev->ifalias)) ||
> +	    nla_put_ifalias(skb, dev) ||
>  	    nla_put_u32(skb, IFLA_CARRIER_CHANGES,
>  			atomic_read(&dev->carrier_changes)) ||
>  	    nla_put_u8(skb, IFLA_PROTO_DOWN, dev->proto_down))
> 

Reviewed-by: David Ahern <dsahern@...il.com>