netdev - Re: [PATCH net-next 2/4] net: dsa: automatically bring user ports down when master goes down

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Date:   Thu, 28 Jan 2021 02:50:14 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH net-next 2/4] net: dsa: automatically bring user ports
 down when master goes down

On Thu, Jan 28, 2021 at 01:46:30AM +0100, Andrew Lunn wrote:
> > +	case NETDEV_GOING_DOWN: {
> > +		struct dsa_port *dp, *cpu_dp;
> > +		struct dsa_switch_tree *dst;
> > +		int err = 0;
> > +
> > +		if (!netdev_uses_dsa(dev))
> > +			return NOTIFY_DONE;
> > +
> > +		cpu_dp = dev->dsa_ptr;
> > +		dst = cpu_dp->ds->dst;
> > +
> > +		list_for_each_entry(dp, &dst->ports, list) {
> > +			if (!dsa_is_user_port(dp->ds, dp->index)) {
>
> !dsa_is_user_port() ??
>
> That ! seems odd.

Oops, that's something that I refactored at the last minute after I
prototyped the idea from:
			if (!dsa_is_user_port(dp->ds, dp->index))
				continue;
because it looked uglier that way.