From patchwork Mon Nov 16 03:27:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Stanley X-Patchwork-Id: 11907337 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5EB1AC2D0E4 for ; Mon, 16 Nov 2020 03:27:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1022E22245 for ; Mon, 16 Nov 2020 03:27:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="I3SZRluV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726520AbgKPD12 (ORCPT ); Sun, 15 Nov 2020 22:27:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55526 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726203AbgKPD12 (ORCPT ); Sun, 15 Nov 2020 22:27:28 -0500 Received: from mail-pl1-x642.google.com (mail-pl1-x642.google.com [IPv6:2607:f8b0:4864:20::642]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3EBD0C0613CF for ; Sun, 15 Nov 2020 19:27:28 -0800 (PST) Received: by mail-pl1-x642.google.com with SMTP id cp9so7714708plb.1 for ; Sun, 15 Nov 2020 19:27:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=G5/TpjKSiRo+4flkqwySOhTPBGKe6xNgV7gAHL7oQNY=; b=I3SZRluVKkKNEcD3waFKsLvu6K3cmY/43t3IBcMPY6uE3B9hfJKTQtlpiIOBJEtvdL /8EzkLTL1RIUt8mSNVl8Afd7GJDpFS17YwMPwVTKzw9+KZIvCfM85+AIO04nKl8hnhgb afpqisEAdeIOW1YgY0jOlqC5i/YAl/lnRNWdVt5V211SZZCt5dyZ/tn/UIsJtYHczYBx 2YSCQQZOkMkrg/WyftMbBypw1wvQK8RbbyF2tmbR5G7R6gJTBaKFuRVa/xlRDRtZ9UiK 7QWSdACt8ymZ9DnwYBLhRiv95aox2VLFyc3fK4N4RtnjyNBVgOq0Yey7j35Jk2UK1kd+ WSsQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :mime-version:content-transfer-encoding; bh=G5/TpjKSiRo+4flkqwySOhTPBGKe6xNgV7gAHL7oQNY=; b=svcUbe5+Mn9oWdCRXInJH/Po4VPNY890kZV2BZQANDCikvE59c+5V4MBx5kr30rLlj Gj74OXP5eVXTefPAQ+l2ZQZiAzhZsbZnWaYs3FCzokeuARsNlDk44j428pcPZb0yzlfX 7ThLQ0klLudaMT7pKGgQv3VsKmyVwXTWO9x4PipfBmzSDZxO7MjWzjbu0FMSOSEEy2YK 8pzbzVvUSckMAfIt+2mYMn5j0g7Az0HKhzeS/XMjdbzYzPt/S58lUUCYfrb2OAeU4tKm Ta1qiO4WwfXNAa0lLye6ini8y/Qt/m0Nk5WgawbQ76xQ14/lCo3MK1b04wFZtjPKTIU3 xvlA== X-Gm-Message-State: AOAM532wXYHOIDDpwLNOHV4CqBlz462CFDP6ITTWIKzcdOe3gnQvyAIM BrvfLCSE+oOITIOoffddwlo= X-Google-Smtp-Source: ABdhPJyVpRbHYEVg/qqLX3WlD+GSzq9npuzpEaeS7xStxNhFhkU6ZJjRyvGQXS5e/4L16Tl1fJonsg== X-Received: by 2002:a17:902:8c90:b029:d6:d3b4:7da8 with SMTP id t16-20020a1709028c90b02900d6d3b47da8mr11759357plo.34.1605497247690; Sun, 15 Nov 2020 19:27:27 -0800 (PST) Received: from localhost.localdomain ([45.124.203.19]) by smtp.gmail.com with ESMTPSA id w15sm1612760pgi.20.2020.11.15.19.27.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 15 Nov 2020 19:27:26 -0800 (PST) Sender: "joel.stan@gmail.com" From: Joel Stanley To: Benjamin Herrenschmidt , "David S . Miller" , Jakub Kicinski Cc: Andrew Jeffery , Ivan Mikhaylov , netdev@vger.kernel.org Subject: [PATCH v2] net: ftgmac100: Fix crash when removing driver Date: Mon, 16 Nov 2020 13:57:15 +1030 Message-Id: <20201116032715.1011071-1-joel@jms.id.au> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org When removing the driver we would hit BUG_ON(!list_empty(&dev->ptype_specific)) in net/core/dev.c due to still having the NC-SI packet handler registered. # echo 1e660000.ethernet > /sys/bus/platform/drivers/ftgmac100/unbind ------------[ cut here ]------------ kernel BUG at net/core/dev.c:10254! Internal error: Oops - BUG: 0 [#1] SMP ARM CPU: 0 PID: 115 Comm: sh Not tainted 5.10.0-rc3-next-20201111-00007-g02e0365710c4 #46 Hardware name: Generic DT based system PC is at netdev_run_todo+0x314/0x394 LR is at cpumask_next+0x20/0x24 pc : [<806f5830>] lr : [<80863cb0>] psr: 80000153 sp : 855bbd58 ip : 00000001 fp : 855bbdac r10: 80c03d00 r9 : 80c06228 r8 : 81158c54 r7 : 00000000 r6 : 80c05dec r5 : 80c05d18 r4 : 813b9280 r3 : 813b9054 r2 : 8122c470 r1 : 00000002 r0 : 00000002 Flags: Nzcv IRQs on FIQs off Mode SVC_32 ISA ARM Segment none Control: 00c5387d Table: 85514008 DAC: 00000051 Process sh (pid: 115, stack limit = 0x7cb5703d) ... Backtrace: [<806f551c>] (netdev_run_todo) from [<80707eec>] (rtnl_unlock+0x18/0x1c) r10:00000051 r9:854ed710 r8:81158c54 r7:80c76bb0 r6:81158c10 r5:8115b410 r4:813b9000 [<80707ed4>] (rtnl_unlock) from [<806f5db8>] (unregister_netdev+0x2c/0x30) [<806f5d8c>] (unregister_netdev) from [<805a8180>] (ftgmac100_remove+0x20/0xa8) r5:8115b410 r4:813b9000 [<805a8160>] (ftgmac100_remove) from [<805355e4>] (platform_drv_remove+0x34/0x4c) Fixes: bd466c3fb5a4 ("net/faraday: Support NCSI mode") Signed-off-by: Joel Stanley --- v2: Also unregister in _probe drivers/net/ethernet/faraday/ftgmac100.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c index 983b6db2d80d..88bfe2107938 100644 --- a/drivers/net/ethernet/faraday/ftgmac100.c +++ b/drivers/net/ethernet/faraday/ftgmac100.c @@ -1926,6 +1926,8 @@ static int ftgmac100_probe(struct platform_device *pdev) err_phy_connect: ftgmac100_phy_disconnect(netdev); err_ncsi_dev: + if (priv->ndev) + ncsi_unregister_dev(priv->ndev); ftgmac100_destroy_mdio(netdev); err_setup_mdio: iounmap(priv->base); @@ -1945,6 +1947,8 @@ static int ftgmac100_remove(struct platform_device *pdev) netdev = platform_get_drvdata(pdev); priv = netdev_priv(netdev); + if (priv->ndev) + ncsi_unregister_dev(priv->ndev); unregister_netdev(netdev); clk_disable_unprepare(priv->rclk);