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([2600:1700:dfe0:49f0:b198:60c0:9fe:66c9]) by smtp.gmail.com with ESMTPSA id y12sm2693999qtj.3.2021.09.12.09.14.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 12 Sep 2021 09:14:18 -0700 (PDT) Message-ID: Date: Sun, 12 Sep 2021 09:14:14 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.1.0 Subject: Re: [RFC PATCH net 1/5] net: mdio: introduce a shutdown method to mdio device drivers Content-Language: en-US To: Vladimir Oltean , netdev@vger.kernel.org Cc: Andrew Lunn , Vivien Didelot , Vladimir Oltean , "David S. Miller" , Jakub Kicinski , Kurt Kanzenbach , Hauke Mehrtens , Woojung Huh , UNGLinuxDriver@microchip.com, Sean Wang , Landen Chao , DENG Qingfang , Matthias Brugger , Claudiu Manoil , Alexandre Belloni , Linus Walleij , George McCollister , Heiner Kallweit , Russell King , Oleksij Rempel , Michael Grzeschik , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Lino Sanfilippo References: <20210912120932.993440-1-vladimir.oltean@nxp.com> <20210912120932.993440-2-vladimir.oltean@nxp.com> From: Florian Fainelli In-Reply-To: <20210912120932.993440-2-vladimir.oltean@nxp.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/12/2021 5:09 AM, Vladimir Oltean wrote: > MDIO-attached devices might have interrupts and other things that might > need quiesced when we kexec into a new kernel. Things are even more > creepy when those interrupt lines are shared, and in that case it is > absolutely mandatory to disable all interrupt sources. > > Moreover, MDIO devices might be DSA switches, and DSA needs its own > shutdown method to unlink from the DSA master, which is a new > requirement that appeared after commit 2f1e8ea726e9 ("net: dsa: link > interfaces with the DSA master to get rid of lockdep warnings"). > > So introduce a ->shutdown method in the MDIO device driver structure. > > Signed-off-by: Vladimir Oltean Reviewed-by: Florian Fainelli -- Florian