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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 D4AA3C2D0E1 for ; Fri, 11 Sep 2020 15:30:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 95AD522207 for ; Fri, 11 Sep 2020 15:30:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599838213; bh=QV0sfvbwCfESZtYBZ+Zp5DwnEUH8bq3nh4G+4hWU03A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=dB7D7fVhX+DXS7MuaBWE0BtNIRY1FXvAqLPjctNJnOfHcFAQERAu6miVf+wtkLO7T 2qcDKxSs/zropUnG9huxRaMJpHiPnm4EpMF0mdneU+XcaVTd9FMNu38s0Iltq0Gl2a 5KVm3qxlVG/6+l9sk4q/fajUdP+lvL9QrvXJQ/5A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725947AbgIKPaA (ORCPT ); Fri, 11 Sep 2020 11:30:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:56252 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726202AbgIKPZa (ORCPT ); Fri, 11 Sep 2020 11:25:30 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A8E4422209; Fri, 11 Sep 2020 12:58:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599829120; bh=QV0sfvbwCfESZtYBZ+Zp5DwnEUH8bq3nh4G+4hWU03A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wPIuovvFc/hezj6zKMBdYesDPmLzucIHSkhYZfoONSffLwnx/KT03WDE0vXIrwFF6 UWQzFsXUy144/CwaQtOxq97g9usSBYb1ipR4BmDedFxSgqeHdB8Kg+BYiZtrGhWPft Rlmq+wALcu3xB9ptNKAiUufkdApb8l+d1s1lxXgo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Rob Sherwood , Jakub Kicinski , Michael Chan , "David S. Miller" Subject: [PATCH 4.9 67/71] bnxt: dont enable NAPI until rings are ready Date: Fri, 11 Sep 2020 14:46:51 +0200 Message-Id: <20200911122508.289139691@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200911122504.928931589@linuxfoundation.org> References: <20200911122504.928931589@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jakub Kicinski commit 96ecdcc992eb7f468b2cf829b0f5408a1fad4668 upstream. Netpoll can try to poll napi as soon as napi_enable() is called. It crashes trying to access a doorbell which is still NULL: BUG: kernel NULL pointer dereference, address: 0000000000000000 CPU: 59 PID: 6039 Comm: ethtool Kdump: loaded Tainted: G S 5.9.0-rc1-00469-g5fd99b5d9950-dirty #26 RIP: 0010:bnxt_poll+0x121/0x1c0 Code: c4 20 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 41 8b 86 a0 01 00 00 41 23 85 18 01 00 00 49 8b 96 a8 01 00 00 0d 00 00 00 24 <89> 02 41 f6 45 77 02 74 cb 49 8b ae d8 01 00 00 31 c0 c7 44 24 1a netpoll_poll_dev+0xbd/0x1a0 __netpoll_send_skb+0x1b2/0x210 netpoll_send_udp+0x2c9/0x406 write_ext_msg+0x1d7/0x1f0 console_unlock+0x23c/0x520 vprintk_emit+0xe0/0x1d0 printk+0x58/0x6f x86_vector_activate.cold+0xf/0x46 __irq_domain_activate_irq+0x50/0x80 __irq_domain_activate_irq+0x32/0x80 __irq_domain_activate_irq+0x32/0x80 irq_domain_activate_irq+0x25/0x40 __setup_irq+0x2d2/0x700 request_threaded_irq+0xfb/0x160 __bnxt_open_nic+0x3b1/0x750 bnxt_open_nic+0x19/0x30 ethtool_set_channels+0x1ac/0x220 dev_ethtool+0x11ba/0x2240 dev_ioctl+0x1cf/0x390 sock_do_ioctl+0x95/0x130 Reported-by: Rob Sherwood Fixes: c0c050c58d84 ("bnxt_en: New Broadcom ethernet driver.") Signed-off-by: Jakub Kicinski Reviewed-by: Michael Chan Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -5589,14 +5589,14 @@ static int __bnxt_open_nic(struct bnxt * } } - bnxt_enable_napi(bp); - rc = bnxt_init_nic(bp, irq_re_init); if (rc) { netdev_err(bp->dev, "bnxt_init_nic err: %x\n", rc); - goto open_err; + goto open_err_irq; } + bnxt_enable_napi(bp); + if (link_re_init) { mutex_lock(&bp->link_lock); rc = bnxt_update_phy_setting(bp); @@ -5618,9 +5618,6 @@ static int __bnxt_open_nic(struct bnxt * return 0; -open_err: - bnxt_disable_napi(bp); - open_err_irq: bnxt_del_napi(bp);