From patchwork Thu May 21 07:27:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Kirsher X-Patchwork-Id: 218837 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=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 ED461C433E0 for ; Thu, 21 May 2020 07:28:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D6E8520738 for ; Thu, 21 May 2020 07:28:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728412AbgEUH2G (ORCPT ); Thu, 21 May 2020 03:28:06 -0400 Received: from mga11.intel.com ([192.55.52.93]:34925 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728364AbgEUH2C (ORCPT ); Thu, 21 May 2020 03:28:02 -0400 IronPort-SDR: uxl5cRZ9r8lsXXF9qf8sh1cSp8QVcsTe6VSWwN9XcVKNQOtlVGRSWulFZiuhNY35OG2lb7kS3L 1L6RlexoaGIw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 May 2020 00:28:02 -0700 IronPort-SDR: DFOGtizIgpuw4MPdRMFQ12kOjPRG88bM7vw5xKiVs2I4Lxvfkj8KWdlu8XZ4k5yzfahYnY6M9r 2tCM/FL9PGrg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,417,1583222400"; d="scan'208";a="343758695" Received: from jtkirshe-desk1.jf.intel.com ([134.134.177.86]) by orsmga001.jf.intel.com with ESMTP; 21 May 2020 00:28:00 -0700 From: Jeff Kirsher To: davem@davemloft.net Cc: Alexander Duyck , netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com, stable , Maxim Zhukov , Jeff Kirsher Subject: [net-next 05/15] e1000: Do not perform reset in reset_task if we are already down Date: Thu, 21 May 2020 00:27:48 -0700 Message-Id: <20200521072758.440264-6-jeffrey.t.kirsher@intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200521072758.440264-1-jeffrey.t.kirsher@intel.com> References: <20200521072758.440264-1-jeffrey.t.kirsher@intel.com> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Alexander Duyck We are seeing a deadlock in e1000 down when NAPI is being disabled. Looking over the kernel function trace of the system it appears that the interface is being closed and then a reset is hitting which deadlocks the interface as the NAPI interface is already disabled. To prevent this from happening I am disabling the reset task when __E1000_DOWN is already set. In addition code has been added so that we set the __E1000_DOWN while holding the __E1000_RESET flag in e1000_close in order to guarantee that the reset task will not run after we have started the close call. CC: stable Signed-off-by: Alexander Duyck Tested-by: Maxim Zhukov Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/e1000/e1000_main.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c index 05bc6e216bca..d9fa4600f745 100644 --- a/drivers/net/ethernet/intel/e1000/e1000_main.c +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c @@ -542,8 +542,13 @@ void e1000_reinit_locked(struct e1000_adapter *adapter) WARN_ON(in_interrupt()); while (test_and_set_bit(__E1000_RESETTING, &adapter->flags)) msleep(1); - e1000_down(adapter); - e1000_up(adapter); + + /* only run the task if not already down */ + if (!test_bit(__E1000_DOWN, &adapter->flags)) { + e1000_down(adapter); + e1000_up(adapter); + } + clear_bit(__E1000_RESETTING, &adapter->flags); } @@ -1433,10 +1438,15 @@ int e1000_close(struct net_device *netdev) struct e1000_hw *hw = &adapter->hw; int count = E1000_CHECK_RESET_COUNT; - while (test_bit(__E1000_RESETTING, &adapter->flags) && count--) + while (test_and_set_bit(__E1000_RESETTING, &adapter->flags) && count--) usleep_range(10000, 20000); - WARN_ON(test_bit(__E1000_RESETTING, &adapter->flags)); + WARN_ON(count < 0); + + /* signal that we're down so that the reset task will no longer run */ + set_bit(__E1000_DOWN, &adapter->flags); + clear_bit(__E1000_RESETTING, &adapter->flags); + e1000_down(adapter); e1000_power_down_phy(adapter); e1000_free_irq(adapter);