From patchwork Fri Jun 19 14:33:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 223755 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 A782FC433E0 for ; Fri, 19 Jun 2020 16:31:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7FD172100A for ; Fri, 19 Jun 2020 16:31:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592584261; bh=8Z0208WZvPIH3GwC9gjC99LzsTJ2x3cE3S37kIwIkMY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=pfmioSAVqW6QaPh4uGLXu0iU3wcBZcZiIGXzjnulbwGFg5Hfa0PdGTX1OScDM14LB 3FlK0ig2A6dHHIJh8+vts80yc3azs4S2+p/6fO5OgS8a+3cP/MWsk3xpFvP7RrfF90 u1Fbs/cpCLZ5pUstu2R3PnkQx4R8ZRJobdrRuo/g= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389713AbgFSQa6 (ORCPT ); Fri, 19 Jun 2020 12:30:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:47448 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389690AbgFSOxO (ORCPT ); Fri, 19 Jun 2020 10:53:14 -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 0AC1E217D8; Fri, 19 Jun 2020 14:53:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592578392; bh=8Z0208WZvPIH3GwC9gjC99LzsTJ2x3cE3S37kIwIkMY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=f4YPzg4CxIDMKZRJIDyjZMAXNSzgsf6wER9YGJneDoYCIv2yWIyZwfpfx7r0n8VP/ D5BVNOteRtp0I6ykQ6OWxQRXGzjHhdnDcZllWAszQkmJrAAbMIKn7MFKOKXrczlU5C NM2QH5EXDiLc5AA6gHRIv4rrX9MVtPx87Gw58yYg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Punit Agrawal , Alexander Duyck , Aaron Brown , Jeff Kirsher Subject: [PATCH 4.14 164/190] e1000e: Relax condition to trigger reset for ME workaround Date: Fri, 19 Jun 2020 16:33:29 +0200 Message-Id: <20200619141641.958494789@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141633.446429600@linuxfoundation.org> References: <20200619141633.446429600@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: Punit Agrawal commit d601afcae2febc49665008e9a79e701248d56c50 upstream. It's an error if the value of the RX/TX tail descriptor does not match what was written. The error condition is true regardless the duration of the interference from ME. But the driver only performs the reset if E1000_ICH_FWSM_PCIM2PCI_COUNT (2000) iterations of 50us delay have transpired. The extra condition can lead to inconsistency between the state of hardware as expected by the driver. Fix this by dropping the check for number of delay iterations. While at it, also make __ew32_prepare() static as it's not used anywhere else. CC: stable Signed-off-by: Punit Agrawal Reviewed-by: Alexander Duyck Tested-by: Aaron Brown Signed-off-by: Jeff Kirsher Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/intel/e1000e/e1000.h | 1 - drivers/net/ethernet/intel/e1000e/netdev.c | 12 +++++------- 2 files changed, 5 insertions(+), 8 deletions(-) --- a/drivers/net/ethernet/intel/e1000e/e1000.h +++ b/drivers/net/ethernet/intel/e1000e/e1000.h @@ -596,7 +596,6 @@ static inline u32 __er32(struct e1000_hw #define er32(reg) __er32(hw, E1000_##reg) -s32 __ew32_prepare(struct e1000_hw *hw); void __ew32(struct e1000_hw *hw, unsigned long reg, u32 val); #define ew32(reg, val) __ew32(hw, E1000_##reg, (val)) --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -137,14 +137,12 @@ static const struct e1000_reg_info e1000 * has bit 24 set while ME is accessing MAC CSR registers, wait if it is set * and try again a number of times. **/ -s32 __ew32_prepare(struct e1000_hw *hw) +static void __ew32_prepare(struct e1000_hw *hw) { s32 i = E1000_ICH_FWSM_PCIM2PCI_COUNT; while ((er32(FWSM) & E1000_ICH_FWSM_PCIM2PCI) && --i) udelay(50); - - return i; } void __ew32(struct e1000_hw *hw, unsigned long reg, u32 val) @@ -625,11 +623,11 @@ static void e1000e_update_rdt_wa(struct { struct e1000_adapter *adapter = rx_ring->adapter; struct e1000_hw *hw = &adapter->hw; - s32 ret_val = __ew32_prepare(hw); + __ew32_prepare(hw); writel(i, rx_ring->tail); - if (unlikely(!ret_val && (i != readl(rx_ring->tail)))) { + if (unlikely(i != readl(rx_ring->tail))) { u32 rctl = er32(RCTL); ew32(RCTL, rctl & ~E1000_RCTL_EN); @@ -642,11 +640,11 @@ static void e1000e_update_tdt_wa(struct { struct e1000_adapter *adapter = tx_ring->adapter; struct e1000_hw *hw = &adapter->hw; - s32 ret_val = __ew32_prepare(hw); + __ew32_prepare(hw); writel(i, tx_ring->tail); - if (unlikely(!ret_val && (i != readl(tx_ring->tail)))) { + if (unlikely(i != readl(tx_ring->tail))) { u32 tctl = er32(TCTL); ew32(TCTL, tctl & ~E1000_TCTL_EN);