From patchwork Fri Aug 20 15:59:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Nguyen X-Patchwork-Id: 500884 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, 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 D6239C432BE for ; Fri, 20 Aug 2021 15:55:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BB6F96113E for ; Fri, 20 Aug 2021 15:55:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241382AbhHTP43 (ORCPT ); Fri, 20 Aug 2021 11:56:29 -0400 Received: from mga17.intel.com ([192.55.52.151]:53677 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241230AbhHTP4U (ORCPT ); Fri, 20 Aug 2021 11:56:20 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10082"; a="197050452" X-IronPort-AV: E=Sophos;i="5.84,338,1620716400"; d="scan'208";a="197050452" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Aug 2021 08:55:43 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,338,1620716400"; d="scan'208";a="680126969" Received: from anguy11-desk2.jf.intel.com ([10.166.244.147]) by fmsmga006.fm.intel.com with ESMTP; 20 Aug 2021 08:55:42 -0700 From: Tony Nguyen To: davem@davemloft.net, kuba@kernel.org Cc: Aaron Ma , netdev@vger.kernel.org, anthony.l.nguyen@intel.com, sasha.neftin@intel.com, vitaly.lifshits@intel.com, Dvora Fuxbrumer Subject: [PATCH net 1/4] igc: fix page fault when thunderbolt is unplugged Date: Fri, 20 Aug 2021 08:59:12 -0700 Message-Id: <20210820155915.1119889-2-anthony.l.nguyen@intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210820155915.1119889-1-anthony.l.nguyen@intel.com> References: <20210820155915.1119889-1-anthony.l.nguyen@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Aaron Ma After unplug thunderbolt dock with i225, pciehp interrupt is triggered, remove call will read/write mmio address which is already disconnected, then cause page fault and make system hang. Check PCI state to remove device safely. Trace: BUG: unable to handle page fault for address: 000000000000b604 Oops: 0000 [#1] SMP NOPTI RIP: 0010:igc_rd32+0x1c/0x90 [igc] Call Trace: igc_ptp_suspend+0x6c/0xa0 [igc] igc_ptp_stop+0x12/0x50 [igc] igc_remove+0x7f/0x1c0 [igc] pci_device_remove+0x3e/0xb0 __device_release_driver+0x181/0x240 Fixes: 13b5b7fd6a4a ("igc: Add support for Tx/Rx rings") Fixes: b03c49cde61f ("igc: Save PTP time before a reset") Signed-off-by: Aaron Ma Tested-by: Dvora Fuxbrumer Signed-off-by: Tony Nguyen --- drivers/net/ethernet/intel/igc/igc_main.c | 32 ++++++++++++++--------- drivers/net/ethernet/intel/igc/igc_ptp.c | 3 ++- 2 files changed, 21 insertions(+), 14 deletions(-) diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index e29aadbc6744..5e9c86ea3a5a 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -149,6 +149,9 @@ static void igc_release_hw_control(struct igc_adapter *adapter) struct igc_hw *hw = &adapter->hw; u32 ctrl_ext; + if (!pci_device_is_present(adapter->pdev)) + return; + /* Let firmware take over control of h/w */ ctrl_ext = rd32(IGC_CTRL_EXT); wr32(IGC_CTRL_EXT, @@ -4449,26 +4452,29 @@ void igc_down(struct igc_adapter *adapter) igc_ptp_suspend(adapter); - /* disable receives in the hardware */ - rctl = rd32(IGC_RCTL); - wr32(IGC_RCTL, rctl & ~IGC_RCTL_EN); - /* flush and sleep below */ - + if (pci_device_is_present(adapter->pdev)) { + /* disable receives in the hardware */ + rctl = rd32(IGC_RCTL); + wr32(IGC_RCTL, rctl & ~IGC_RCTL_EN); + /* flush and sleep below */ + } /* set trans_start so we don't get spurious watchdogs during reset */ netif_trans_update(netdev); netif_carrier_off(netdev); netif_tx_stop_all_queues(netdev); - /* disable transmits in the hardware */ - tctl = rd32(IGC_TCTL); - tctl &= ~IGC_TCTL_EN; - wr32(IGC_TCTL, tctl); - /* flush both disables and wait for them to finish */ - wrfl(); - usleep_range(10000, 20000); + if (pci_device_is_present(adapter->pdev)) { + /* disable transmits in the hardware */ + tctl = rd32(IGC_TCTL); + tctl &= ~IGC_TCTL_EN; + wr32(IGC_TCTL, tctl); + /* flush both disables and wait for them to finish */ + wrfl(); + usleep_range(10000, 20000); - igc_irq_disable(adapter); + igc_irq_disable(adapter); + } adapter->flags &= ~IGC_FLAG_NEED_LINK_UPDATE; diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c index 69617d2c1be2..4ae19c6a3247 100644 --- a/drivers/net/ethernet/intel/igc/igc_ptp.c +++ b/drivers/net/ethernet/intel/igc/igc_ptp.c @@ -849,7 +849,8 @@ void igc_ptp_suspend(struct igc_adapter *adapter) adapter->ptp_tx_skb = NULL; clear_bit_unlock(__IGC_PTP_TX_IN_PROGRESS, &adapter->state); - igc_ptp_time_save(adapter); + if (pci_device_is_present(adapter->pdev)) + igc_ptp_time_save(adapter); } /**