From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 35A5FC5CFFE for ; Tue, 11 Dec 2018 15:47:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EBE3020989 for ; Tue, 11 Dec 2018 15:47:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544543235; bh=A6V1Hq06bn19ISrH+ofeByRCf3jCqEkPFyfmzRhaeqg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kWioLxcD3lUndncGmq2zqCplN8c52iKYG0ZbTaLr6IVBXx8L9Rjqsf51tXDX8Zz+m zZJYtmPL4rvRmN/54tW3YAsTr3+kE+r+kMe1OelHRVUh9l3fo3mVtMaZIZ9vRnfwLZ NivGRZKYSpE77Q9hat1ZkdXx1PYh45TysUtsc+qM= DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EBE3020989 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728500AbeLKPrN (ORCPT ); Tue, 11 Dec 2018 10:47:13 -0500 Received: from mail.kernel.org ([198.145.29.99]:35606 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728486AbeLKPrK (ORCPT ); Tue, 11 Dec 2018 10:47:10 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 987342133F; Tue, 11 Dec 2018 15:47:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544543230; bh=A6V1Hq06bn19ISrH+ofeByRCf3jCqEkPFyfmzRhaeqg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LBbfIrzS7qyk4V9eT42OgLEBLFb8qfQ3BNgW4g8Fvvavgd2JGFgEeOFXjAD0xu1Il t8zQMGiuPovsGZm6buRkOtMBQY+Yr2itpvOq+sjZVM/+ffZ5DjCOhU4sR+FpqW3x+W xjhmJm85ZpHQOnyG2oAKhQIsIi1dzaRmdKo0Gark= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Denis Bolotin , Michal Kalderon , "David S. Miller" , Sasha Levin Subject: [PATCH 4.4 63/91] qed: Fix reading wrong value in loop condition Date: Tue, 11 Dec 2018 16:41:22 +0100 Message-Id: <20181211151611.216751710@linuxfoundation.org> X-Mailer: git-send-email 2.20.0 In-Reply-To: <20181211151606.026852373@linuxfoundation.org> References: <20181211151606.026852373@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit ed4eac20dcffdad47709422e0cb925981b056668 ] The value of "sb_index" is written by the hardware. Reading its value and writing it to "index" must finish before checking the loop condition. Signed-off-by: Denis Bolotin Signed-off-by: Michal Kalderon Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/qlogic/qed/qed_int.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/qlogic/qed/qed_int.c b/drivers/net/ethernet/qlogic/qed/qed_int.c index 9cc9d62c1fec..8b15a018d625 100644 --- a/drivers/net/ethernet/qlogic/qed/qed_int.c +++ b/drivers/net/ethernet/qlogic/qed/qed_int.c @@ -177,6 +177,8 @@ static int qed_int_attentions(struct qed_hwfn *p_hwfn) */ do { index = p_sb_attn->sb_index; + /* finish reading index before the loop condition */ + dma_rmb(); attn_bits = le32_to_cpu(p_sb_attn->atten_bits); attn_acks = le32_to_cpu(p_sb_attn->atten_ack); } while (index != p_sb_attn->sb_index); -- 2.19.1