From patchwork Fri Jun 19 14:33:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 223831 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 82BA5C433DF for ; Fri, 19 Jun 2020 16:15:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5823A217D9 for ; Fri, 19 Jun 2020 16:15:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592583347; bh=n13eyRRomMJps8ls0nwvReLF+/XPiXI8h6Y4M9+PegI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=HzdNodXeg6QQyEAl8zpWHOQPoHp/ei6rzbsRaKTC4AMpll5RraP866sQtOZthdVRH K0/XTTB7oxXXqgp9Znnmf1JccTKeH5Jaotlqrt+Gign3cH7x2MOQcV/o0sUvFWRlbh Q3abDxMQwaH10glfT9lzursWx4pFJvxRew0CncMs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391022AbgFSQPq (ORCPT ); Fri, 19 Jun 2020 12:15:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:60262 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389254AbgFSPD3 (ORCPT ); Fri, 19 Jun 2020 11:03:29 -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 4C6B2206DB; Fri, 19 Jun 2020 15:03:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592579009; bh=n13eyRRomMJps8ls0nwvReLF+/XPiXI8h6Y4M9+PegI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=h1x0h04PACZJe82gth7XV45WmgIHiKn2v33Oc8x6QVyvuffWC7mp7rT78ow5+3Gth b/9ecOZrcX2jAE+09889RMOM98OKPEteVY99/BSEfIVj7qRexvS6X69cONbKEufEOB ZNiRyNxftswWGHH4ppkxgMcZ5KIc4mnXdyNKkjik= 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 4.19 241/267] igb: Report speed and duplex as unknown when device is runtime suspended Date: Fri, 19 Jun 2020 16:33:46 +0200 Message-Id: <20200619141700.258235248@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141648.840376470@linuxfoundation.org> References: <20200619141648.840376470@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 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 @@ -143,7 +143,8 @@ static int igb_get_link_ksettings(struct u32 speed; u32 supported, advertising; - status = rd32(E1000_STATUS); + status = pm_runtime_suspended(&adapter->pdev->dev) ? + 0 : rd32(E1000_STATUS); if (hw->phy.media_type == e1000_media_type_copper) { supported = (SUPPORTED_10baseT_Half |