Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH -next] net: dsa: mv88e6xxx: Fix build warning when
 CONFIG_NET_DSA_LEGACY is n
To:     Andrew Lunn <andrew@lunn.ch>,
        Zhangshaokun <zhangshaokun@hisilicon.com>
Cc:     netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Vivien Didelot <vivien.didelot@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        "David S. Miller" <davem@davemloft.net>
References: <1551703381-52115-1-git-send-email-zhangshaokun@hisilicon.com>
 <20190304132617.GB26378@lunn.ch>
 <bc528808-2ad5-90ae-4bc0-afa47a7c4f42@hisilicon.com>
 <20190304145710.GA17097@lunn.ch>
From:   Heiner Kallweit <hkallweit1@gmail.com>
Message-ID: <74a6581e-f761-0fb0-3200-e82b7ac88e75@gmail.com>
Date:   Mon, 4 Mar 2019 19:18:41 +0100
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101
 Thunderbird/60.5.1
MIME-Version: 1.0
In-Reply-To: <20190304145710.GA17097@lunn.ch>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 04.03.2019 15:57, Andrew Lunn wrote:
> On Mon, Mar 04, 2019 at 10:16:08PM +0800, Zhangshaokun wrote:
>> Hi Andrew,
>>
>> On 2019/3/4 21:26, Andrew Lunn wrote:
>>> On Mon, Mar 04, 2019 at 08:43:01PM +0800, Shaokun Zhang wrote:
>>>> When CONFIG_NET_DSA_LEGACY is n, there is a GCC bulid warning:
>>>> drivers/net/dsa/mv88e6xxx/chip.c:4623:13: warning: ‘mv88e6xxx_ports_cmode_init’ defined but not used [-Wunused-function]
>>>> static void mv88e6xxx_ports_cmode_init(struct mv88e6xxx_chip *chip)
>>>> Let's fix it.
>>>
>>> Hi Shaokun, Heiner
>>>
>>> Although this fixes the warning, i suspect there i something wrong
>>> with the original patch adding mv88e6390x_port_set_cmode(). It should
>>> also be used without CONFIG_NET_DSA_LEGACY.
>>
>> I checked the commit-id 2a93c1a3651f ("net: dsa: Allow compiling out legacy support") by Florian.
>> Do you mean that CONFIG_NET_DSA_LEGACY shall be removed completely? :-)
> 
> No, i suspect mv88e6390x_ports_cmode_init() is being called from the
> wrong place, or needs to be called from a second location.
> 
> [Goes and looks at the code]
> 
> Yes, it should also be called in mv88e6xxx_probe(). I would call it
> just after the call to mv88e6xxx_detect(), so that it is the same as
> in mv88e6xxx_drv_probe().
> 
> There are two ways DSA drivers can be probed. The legacy way, which is
> optional, and is slowly getting removed, and the current way. Heiner
> is new to DSA and probably missed that, and only handled the legacy
> probe method. I also missed checking when i reviewed to patch :-(
> 
Right, I missed that, will submit a fix.

I just saw that the Kconfig entry comment for NET_DSA_LEGACY says:
"This feature is scheduled for removal in 4.17."

Was forgotten to remove it or did somebody scream loud enough
"But I depend on it" ?

>    Andrew
> 
Heiner
> 
> 
>