netdev - Re: [PATCH NET 2/2] net: hns: Use phy

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Message-ID: <20170623040544.GC5432@lunn.ch>
Date:   Fri, 23 Jun 2017 06:05:44 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Yunsheng Lin <linyunsheng@...wei.com>
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 2/2] net: hns: Use phy_driver to setup Phy loopback

> what should the Mac driver do when it receive the error? I assume that it
> will return it to userspace. because the rtnl_lock ensure only one ethtool
> is executing, if the function return error, it means some bug in the mac
> driver, am I right?

Yes, return it. It could be there are other use cases of loopback,
which are not protected by the rtnl_lock.

      Andrew