From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65CECC43219 for ; Tue, 28 Sep 2021 06:02:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 50A9561266 for ; Tue, 28 Sep 2021 06:02:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239606AbhI1GET (ORCPT ); Tue, 28 Sep 2021 02:04:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:48754 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239625AbhI1GCr (ORCPT ); Tue, 28 Sep 2021 02:02:47 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2E87D613B5; Tue, 28 Sep 2021 05:57:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1632808655; bh=QH4WM6JybP8VY6blTEobSCVrUtbDcdaxuYSvThxX7sg=; h=From:To:Cc:Subject:Date:From; b=MKHNW8a3Tvydfia/2Jzu4ObdcVDT6WpK+n2hPF0a5imQB4BBxYh84X7vCKQiwZ/S7 c7Ec0x7o6J1lxZPGtY4W/0Bk4utesKAD5PrsJVkMwjoHjZoWHugdXl0NhYF9++g/O5 rpV1NxSeVvSM9oU/FBK1aHnI0aDu6WcUwRxVi9acY8PbCLX0fZsNLcizxJIUWsJQeJ TmbcEraU1Il3FcgR+4bBDAMd+UMStaNcr1qH/PIA3PmHaR6QfhAhrCTEE4I3xkJRxX LurS6Lzgjq+TR/VFEAmoFmB8glFch61zT7QOkk7+hGgWxydMHJ+1h2b1XiOS6E5ePP 19s2mhkgVybnQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Vladimir Oltean , Andrew Lunn , Florian Fainelli , "David S . Miller" , Sasha Levin , hkallweit1@gmail.com, kuba@kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 1/6] net: mdio: introduce a shutdown method to mdio device drivers Date: Tue, 28 Sep 2021 01:57:29 -0400 Message-Id: <20210928055734.173182-1-sashal@kernel.org> X-Mailer: git-send-email 2.33.0 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Vladimir Oltean [ Upstream commit cf9579976f724ad517cc15b7caadea728c7e245c ] 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: Andrew Lunn Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/phy/mdio_device.c | 11 +++++++++++ include/linux/mdio.h | 3 +++ 2 files changed, 14 insertions(+) diff --git a/drivers/net/phy/mdio_device.c b/drivers/net/phy/mdio_device.c index 9c88e6749b9a..34600b0061bb 100644 --- a/drivers/net/phy/mdio_device.c +++ b/drivers/net/phy/mdio_device.c @@ -135,6 +135,16 @@ static int mdio_remove(struct device *dev) return 0; } +static void mdio_shutdown(struct device *dev) +{ + struct mdio_device *mdiodev = to_mdio_device(dev); + struct device_driver *drv = mdiodev->dev.driver; + struct mdio_driver *mdiodrv = to_mdio_driver(drv); + + if (mdiodrv->shutdown) + mdiodrv->shutdown(mdiodev); +} + /** * mdio_driver_register - register an mdio_driver with the MDIO layer * @new_driver: new mdio_driver to register @@ -149,6 +159,7 @@ int mdio_driver_register(struct mdio_driver *drv) mdiodrv->driver.bus = &mdio_bus_type; mdiodrv->driver.probe = mdio_probe; mdiodrv->driver.remove = mdio_remove; + mdiodrv->driver.shutdown = mdio_shutdown; retval = driver_register(&mdiodrv->driver); if (retval) { diff --git a/include/linux/mdio.h b/include/linux/mdio.h index bf9d1d750693..78b3cf50566f 100644 --- a/include/linux/mdio.h +++ b/include/linux/mdio.h @@ -61,6 +61,9 @@ struct mdio_driver { /* Clears up any memory if needed */ void (*remove)(struct mdio_device *mdiodev); + + /* Quiesces the device on system shutdown, turns off interrupts etc */ + void (*shutdown)(struct mdio_device *mdiodev); }; #define to_mdio_driver(d) \ container_of(to_mdio_common_driver(d), struct mdio_driver, mdiodrv) -- 2.33.0