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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <45b0aaad-839a-95e6-2785-118dd844efbc@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 1/16/20 12:47 PM, Heiner Kallweit wrote: > On 16.01.2020 18:46, Vladimir Oltean wrote: >> From: Alex Marginean >> >> The APIs can be used by Ethernet drivers without actually loading a PHY >> driver. This may become more widespread in the future with 802.3z >> compatible MAC PCS devices being locally driven by the MAC driver when >> configuring for a PHY mode with in-band negotiation. >> >> Check that drv is not NULL before reading from it. >> > If there's no dedicated PHY driver, then the genphy driver is bound. > I think therefore we don't face issues with the current code. > But the change looks reasonable. You can unbind the driver from sysfs and observe the problem. -- Florian