netdev - Re: [PATCH v2 net-next] net: make use of helper netif_is_bridge

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Date:   Sat, 16 Oct 2021 13:56:26 +0300
From:   Nikolay Aleksandrov <nikolay@...dia.com>
To:     Kyungrok Chung <acadx0@...il.com>,
        Marek Lindner <mareklindner@...mailbox.ch>,
        Simon Wunderlich <sw@...onwunderlich.de>,
        Antonio Quartulli <a@...table.cc>,
        Sven Eckelmann <sven@...fation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Roopa Prabhu <roopa@...dia.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>
Cc:     b.a.t.m.a.n@...ts.open-mesh.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bridge@...ts.linux-foundation.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org
Subject: Re: [PATCH v2 net-next] net: make use of helper
 netif_is_bridge_master()

On 16/10/2021 08:04, Kyungrok Chung wrote:
> Make use of netdev helper functions to improve code readability.
> Replace 'dev->priv_flags & IFF_EBRIDGE' with netif_is_bridge_master(dev).
> 
> Signed-off-by: Kyungrok Chung <acadx0@...il.com>
> ---
> 
> v1->v2:
>   - Apply fixes to batman-adv, core too.
> 
>  net/batman-adv/multicast.c      | 2 +-
>  net/bridge/br.c                 | 4 ++--
>  net/bridge/br_fdb.c             | 6 +++---
>  net/bridge/br_if.c              | 2 +-
>  net/bridge/br_ioctl.c           | 2 +-
>  net/bridge/br_mdb.c             | 4 ++--
>  net/bridge/br_netfilter_hooks.c | 2 +-
>  net/bridge/br_netlink.c         | 4 ++--
>  net/core/rtnetlink.c            | 2 +-
>  9 files changed, 14 insertions(+), 14 deletions(-)
> 
[snip]
>  	err = br_afspec(br, p, afspec, RTM_DELLINK, &changed, NULL);
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index 2dc1b209ba91..d3676666a529 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -4384,7 +4384,7 @@ static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
>  					continue;
>  
>  				if (br_dev != netdev_master_upper_dev_get(dev) &&
> -				    !(dev->priv_flags & IFF_EBRIDGE))
> +				    netif_is_bridge_master(dev))
>  					continue;
>  				cops = ops;
>  			}
> 

This looks wrong, the original check is if it's _not_ a bridge master.