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 3DF58C5CFFE for ; Tue, 11 Dec 2018 16:15:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 045A02084E for ; Tue, 11 Dec 2018 16:15:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544544917; bh=oWVul6qvEy0CKUGu+kt0rai5O5JE1B3HIynLdLcygbk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=IPbGLDhI2R0d1YoPjPDy+OHcK5XkTl4bi+138NiowUC4x5VT5Q1VvQ0zEby7BSW2s 7c4PsHi3YncVVsvf8oPa9qBpL3Bw6LH59MIgLll63pwB77ERmSNVk4t1fLAv0ccT0w jYsA47X2wo0xRUt2J5uDQn1noGb4pksReLVCy9E0= DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 045A02084E 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 S1729762AbeLKQPP (ORCPT ); Tue, 11 Dec 2018 11:15:15 -0500 Received: from mail.kernel.org ([198.145.29.99]:37238 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728896AbeLKPsw (ORCPT ); Tue, 11 Dec 2018 10:48:52 -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 403122133F; Tue, 11 Dec 2018 15:48:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544543331; bh=oWVul6qvEy0CKUGu+kt0rai5O5JE1B3HIynLdLcygbk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nXz0FYWk76RbjGOMk+22Cbg8GwHMBbOnISCEBZA9d+cj9CL60a2tQwyJr4y+OhKzL DrOldYl9TMOz42CwSPuH4aCfymFzpTtaAUj2uGcpCo98IIg7tLkt70O1kLOgfgvdpI okcd4qEiKEKbfUcXEc7VVBNWab1Nz9KctZwubmbI= 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 4.9 10/51] qed: Fix reading wrong value in loop condition Date: Tue, 11 Dec 2018 16:41:18 +0100 Message-Id: <20181211151613.590661365@linuxfoundation.org> X-Mailer: git-send-email 2.20.0 In-Reply-To: <20181211151612.328911565@linuxfoundation.org> References: <20181211151612.328911565@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 4.9-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 2adedc6fb6cf..fd19372db2f8 100644 --- a/drivers/net/ethernet/qlogic/qed/qed_int.c +++ b/drivers/net/ethernet/qlogic/qed/qed_int.c @@ -2135,6 +2135,8 @@ 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