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=-6.8 required=3.0 tests=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=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 258EBC433DF for ; Fri, 19 Jun 2020 14:44:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E646521556 for ; Fri, 19 Jun 2020 14:44:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592577854; bh=V7t7/rNV/8i90L5LWGoUJj5anpjm3tjRYXmHt2mdNf4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=IBiKP0ub5mlqBQ02TLe6v3p0NfdR7szy8Btdk/sq3tljKn3nrUNWYWMUuDSRPw0pp FJFZk/pEmTzZVJ6i0cygB7GvAd4lS5tdxSaRc38FKas6eut/cYaHskmB1TE7n7Ss2u 4flrG+HA2b50h/Grao2/U5tLfuqtLE4mhAKp99sM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388517AbgFSOoM (ORCPT ); Fri, 19 Jun 2020 10:44:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:35386 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388006AbgFSOoJ (ORCPT ); Fri, 19 Jun 2020 10:44:09 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 3461A21556; Fri, 19 Jun 2020 14:44:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592577847; bh=V7t7/rNV/8i90L5LWGoUJj5anpjm3tjRYXmHt2mdNf4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PH/CYJPL7Ykyn+ET0B9yrU8ncif8hzpjOm6qJdYSlG1B2NqIojtN5ptbQM69rtcvy 1DChr2qLkyvpaWIo6wnqyvjnMUZxk230EscF3DhxeqDDMZ2ugq9kVuvL3CjHcbV14S N05k9z8QGC0rPFqpnnlLWtTufac+a6CSY5zhyVOE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Duyck , Kai-Heng Feng , Aaron Brown , Jeff Kirsher Subject: [PATCH 4.9 113/128] igb: Report speed and duplex as unknown when device is runtime suspended Date: Fri, 19 Jun 2020 16:33:27 +0200 Message-Id: <20200619141626.112430569@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141620.148019466@linuxfoundation.org> References: <20200619141620.148019466@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Kai-Heng Feng commit 165ae7a8feb53dc47fb041357e4b253bfc927cf9 upstream. igb device gets runtime suspended when there's no link partner. We can't get correct speed under that state: $ cat /sys/class/net/enp3s0/speed 1000 In addition to that, an error can also be spotted in dmesg: [ 385.991957] igb 0000:03:00.0 enp3s0: PCIe link lost Since device can only be runtime suspended when there's no link partner, we can skip reading register and let the following logic set speed and duplex with correct status. The more generic approach will be wrap get_link_ksettings() with begin() and complete() callbacks. However, for this particular issue, begin() calls igb_runtime_resume() , which tries to rtnl_lock() while the lock is already hold by upper ethtool layer. So let's take this approach until the igb_runtime_resume() no longer needs to hold rtnl_lock. CC: stable Suggested-by: Alexander Duyck Signed-off-by: Kai-Heng Feng Tested-by: Aaron Brown Signed-off-by: Jeff Kirsher Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/intel/igb/igb_ethtool.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/net/ethernet/intel/igb/igb_ethtool.c +++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c @@ -153,7 +153,8 @@ static int igb_get_settings(struct net_d u32 status; u32 speed; - status = rd32(E1000_STATUS); + status = pm_runtime_suspended(&adapter->pdev->dev) ? + 0 : rd32(E1000_STATUS); if (hw->phy.media_type == e1000_media_type_copper) { ecmd->supported = (SUPPORTED_10baseT_Half |