linux-kernel - Re: [PATCH 2/3] bridge: trigger a bridge calculation upon port changes

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Message-ID: <CAHA+R7Pf6rM5h1uGiqrru5LkN9C7Nm7V42cucHSOV1s7_+F7Gw@mail.gmail.com>
Date:	Thu, 13 Mar 2014 11:26:25 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kvm@...r.kernel.org, xen-devel@...ts.xenproject.org,
	mcgrof@...e.com, Stephen Hemminger <stephen@...workplumber.org>,
	bridge@...ts.linux-foundation.org
Subject: Re: [PATCH 2/3] bridge: trigger a bridge calculation upon port changes

On Wed, Mar 12, 2014 at 8:15 PM, Luis R. Rodriguez
<mcgrof@...not-panic.com> wrote:
>                         spin_lock_bh(&p->br->lock);
>                         err = br_setport(p, tb);
> +                       changed = br_stp_recalculate_bridge_id(p->br);

Looks like you only want to check if the mac addr gets changed here,
but br_stp_recalculate_bridge_id() does more than just checking it,
are you sure the side-effects are all what you want here?

>                         spin_unlock_bh(&p->br->lock);
> +                       if (changed)
> +                               call_netdevice_notifiers(NETDEV_CHANGEADDR,
> +                                                        p->br->dev);
> +                       netdev_update_features(p->br->dev);

I think this is supposed to be in netdev event handler of br->dev
instead of here.
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