linux-kernel - Re: [PATCH NET 1/2] net: phy: Add phy loopback support in net phy framework

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Message-ID: <436ddf50-93d6-f15a-e9f6-bf8e43b63fec@huawei.com>
Date:   Fri, 23 Jun 2017 11:57:56 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <davem@...emloft.net>, <f.fainelli@...il.com>,
        <huangdaode@...ilicon.com>, <xuwei5@...ilicon.com>,
        <liguozhu@...ilicon.com>, <Yisen.Zhuang@...wei.com>,
        <gabriele.paoloni@...wei.com>, <john.garry@...wei.com>,
        <linuxarm@...wei.com>, <salil.mehta@...wei.com>,
        <lipeng321@...wei.com>, <tremyfr@...il.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH NET 1/2] net: phy: Add phy loopback support in net phy
 framework

Hi, Andrew

On 2017/6/23 11:16, Andrew Lunn wrote:
>> +int genphy_loopback(struct phy_device *phydev, bool enable)
>> +{
>> +	int value;
>> +
>> +	if (enable) {
>> +		value = phy_read(phydev, MII_BMCR);
>> +		phy_write(phydev, MII_BMCR, value | BMCR_LOOPBACK);
>> +	} else {
>> +		value = phy_read(phydev, MII_BMCR);
>> +		phy_write(phydev, MII_BMCR, value & ~BMCR_LOOPBACK);
>> +	}
> 
> You should add error checking here. Both phy_read and phy_write can
> return an error. Also, do the read and write once.
Thanks for pointing out, will do that next vesion.

> 
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL(genphy_loopback);
>> +
>> +static int gen10g_loopback(struct phy_device *phydev, bool enable)
>> +{
>> +	return 0;
>> +}
> 
> This is pointless. The core code in phy.c should first check if the
> function exists before calling it. So not having a 10g method is fine.
> 
will remove it next vesion.

Best Regards
Yunsheng Lin