linux-kernel - Re: [PATCH NET v3 1/2] net: phy: Add phy loopback support in net phy framework

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <0fa5d2df-741e-06ba-96f3-567f47f82e3e@huawei.com>
Date:   Sat, 24 Jun 2017 11:40:52 +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 v3 1/2] net: phy: Add phy loopback support in net phy
 framework

Hi, Andrew

On 2017/6/24 11:12, Andrew Lunn wrote:
>> +int phy_loopback(struct phy_device *phydev, bool enable)
>> +{
>> +	struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
>> +	int ret = 0;
>> +
>> +	if (enable && phydev->loopback_enabled)
>> +		return -EBUSY;
>> +
>> +	if (!enable && !phydev->loopback_enabled)
>> +		return -EINVAL;
>> +
>> +	if (phydev->drv && phydrv->set_loopback)
>> +		ret = phydrv->set_loopback(phydev, enable);
> 
>    	else
> 		ret = -EOPNOTSUPP;
> 
>> +
>> +	if (ret)
>> +		return ret;
>> +
>> +	phydev->loopback_enabled = enable;
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL(phy_loopback);
> 
> One of the comments we made of the PHY code in the hns driver is that
> its locking is completely broken. You have made the same error
> here. The core needs to hold the mutex while calling into the PHY
> driver.
Do you mean hns_nic_config_phy_loopback need to hold the mutex while
calling phy_loopback? and other place that calling phy_* function?

Best Regards
Yunsheng Lin