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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 490D3C282DA for ; Wed, 17 Apr 2019 07:35:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 21DB02176F for ; Wed, 17 Apr 2019 07:35:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728143AbfDQHf2 (ORCPT ); Wed, 17 Apr 2019 03:35:28 -0400 Received: from paleale.coelho.fi ([176.9.41.70]:53526 "EHLO farmhouse.coelho.fi" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726773AbfDQHf2 (ORCPT ); Wed, 17 Apr 2019 03:35:28 -0400 Received: from 91-156-6-193.elisa-laajakaista.fi ([91.156.6.193] helo=redipa.ger.corp.intel.com) by farmhouse.coelho.fi with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.91) (envelope-from ) id 1hGf6G-0006gA-PY; Wed, 17 Apr 2019 10:35:21 +0300 From: Luca Coelho To: kvalo@codeaurora.org, johannes@sipsolutions.net, emmanuel.grumbach@intel.com, linuxwifi@intel.com Cc: linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, Shahar S Matityahu , Michal Hocko , Luca Coelho Date: Wed, 17 Apr 2019 10:35:16 +0300 Message-Id: <20190417073516.24250-1-luca@coelho.fi> X-Mailer: git-send-email 2.20.1 In-Reply-To: <748205b02961167b0926d4afe8d9ad9cb37bf6ef.camel@coelho.fi> References: <748205b02961167b0926d4afe8d9ad9cb37bf6ef.camel@coelho.fi> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [PATCH] iwlwifi: don't panic in error path on non-msix systems Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Shahar S Matityahu The driver uses msix causes-register to handle both msix and non msix interrupts when performing sync nmi. On devices that do not support msix this register is unmapped and accessing it causes a kernel panic. Solve this by differentiating the two cases and accessing the proper causes-register in each case. Reported-by: Michal Hocko Signed-off-by: Shahar S Matityahu Signed-off-by: Luca Coelho --- .../net/wireless/intel/iwlwifi/pcie/trans.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c index 79c1dc05f948..c4375b868901 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c @@ -3644,20 +3644,27 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev, void iwl_trans_pcie_sync_nmi(struct iwl_trans *trans) { + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); unsigned long timeout = jiffies + IWL_TRANS_NMI_TIMEOUT; + u32 inta_addr, sw_err_bit; + + if (trans_pcie->msix_enabled) { + inta_addr = CSR_MSIX_HW_INT_CAUSES_AD; + sw_err_bit = MSIX_HW_INT_CAUSES_REG_SW_ERR; + } else { + inta_addr = CSR_INT; + sw_err_bit = CSR_INT_BIT_SW_ERR; + } iwl_disable_interrupts(trans); iwl_force_nmi(trans); while (time_after(timeout, jiffies)) { - u32 inta_hw = iwl_read32(trans, - CSR_MSIX_HW_INT_CAUSES_AD); + u32 inta_hw = iwl_read32(trans, inta_addr); /* Error detected by uCode */ - if (inta_hw & MSIX_HW_INT_CAUSES_REG_SW_ERR) { + if (inta_hw & sw_err_bit) { /* Clear causes register */ - iwl_write32(trans, CSR_MSIX_HW_INT_CAUSES_AD, - inta_hw & - MSIX_HW_INT_CAUSES_REG_SW_ERR); + iwl_write32(trans, inta_addr, inta_hw & sw_err_bit); break; } -- 2.20.1