linux-kernel - Re: [PATCH net-next] net: dsa: microchip: split adjust_link() in phylink_mac_link

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Date:   Thu, 2 Jul 2020 13:14:33 +0000
From:   <Codrin.Ciubotariu@...rochip.com>
To:     <linux@...linux.org.uk>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <Woojung.Huh@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
        <andrew@...n.ch>, <vivien.didelot@...il.com>,
        <f.fainelli@...il.com>, <davem@...emloft.net>, <kuba@...nel.org>
Subject: Re: [PATCH net-next] net: dsa: microchip: split adjust_link() in
 phylink_mac_link_{up|down}()

On 02.07.2020 13:19, Russell King - ARM Linux admin wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On Thu, Jul 02, 2020 at 12:54:39PM +0300, Codrin Ciubotariu wrote:
>> The DSA subsystem moved to phylink and adjust_link() became deprecated in
>> the process. This patch removes adjust_link from the KSZ DSA switches and
>> adds phylink_mac_link_up() and phylink_mac_link_down().
>>
>> Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
> 
> For the code _transformation_ that the patch does:
> 
> Reviewed-by: Russell King <rmk+kernel@...linux.org.uk>
> 
> as it is equivalent.  However, for a deeper review of what is going
> on here, I've a question:
> 
> $ grep live_ports *
> ksz8795.c:         dev->live_ports = dev->host_mask;
> ksz8795.c:                 dev->live_ports |= BIT(port);
> ksz_common.h:      u16 live_ports;
> ksz_common.c:              dev->live_ports &= ~(1 << port);
> ksz_common.c:              dev->live_ports |= (1 << port) & dev->on_ports;
> ksz_common.c:      dev->live_ports &= ~(1 << port);
> ksz9477.c:         dev->live_ports = dev->host_mask;
> ksz9477.c:                 dev->live_ports |= (1 << port);
> 
> These are the only references to dev->live_ports, so the purpose of
> dev->live_ports seems unclear; it seems it is only updated but never
> read.  Can it be removed, along with the locking in your new functions?

Sure, I'll make a patch to clean things up. I will resend this patch in 
a series to mark the dependency.

Thanks and best regards,
Codrin

> 
> Thanks.
> 
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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