netdev - Re: [PATCH net-next] net: bridge: vlan: check for errors from __vlan_del in __vlan

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Message-ID: <20220214155205.22135ebb@hermes.local>
Date:   Mon, 14 Feb 2022 15:52:05 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     netdev@...r.kernel.org, Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next] net: bridge: vlan: check for errors from
 __vlan_del in __vlan_flush

On Tue, 15 Feb 2022 01:36:46 +0200
Vladimir Oltean <vladimir.oltean@....com> wrote:

> +		if (err) {
> +			br_err(br,
> +			       "port %u(%s) failed to delete vlan %d: %pe\n",
> +			       (unsigned int) p->port_no, p->dev->name,
> +			       vlan->vid, ERR_PTR(err));

Don't understand this last argument here.
It takes an integer error number, then converts it to an error pointer
just so the error message can then decode with %pe? Why?