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=-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,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 0E1E5C2D0DB for ; Tue, 28 Jan 2020 14:06:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D3DCF24683 for ; Tue, 28 Jan 2020 14:06:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580220387; bh=Y/HWBZEFvdTGW6XNFPNxL6VXarzoQPnz8xuwDjlImvA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GRFDo3SzdPViwfhb4h3LXb8kIg9B/9E0lrGs3muDgtC/sRs67zARg+m5fm8KC5BZh 1bW7JSjN0kO7eSe1BwYZPzpmu4KmEFQE5PQuXWuwbAgFM3BrIEEjnQFxkhGXBShysf sHCDeJZX+IEke8BwmpB4wo3uJXVvw8gC1EwQicm8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727860AbgA1OG1 (ORCPT ); Tue, 28 Jan 2020 09:06:27 -0500 Received: from mail.kernel.org ([198.145.29.99]:51962 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728132AbgA1OEk (ORCPT ); Tue, 28 Jan 2020 09:04:40 -0500 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 739672468A; Tue, 28 Jan 2020 14:04:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580220279; bh=Y/HWBZEFvdTGW6XNFPNxL6VXarzoQPnz8xuwDjlImvA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LEVe/roWXjUR/I/1fQGneK2Y05wNEC+aYlGVcrC9nifX5AbcYzYoW5UgD7PXrGBNp EoXgkjtxTuXW7mLVsMIJyxGbVEKoFNgSvo6bVsm9mJ2hC4UbSZvYuuZf3wxC9oY8FV 95wRjfDgTOk1N1wodd+KWh72TOdHLe9F1nckgNts= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stan Johnson , Finn Thain , "David S. Miller" Subject: [PATCH 5.4 089/104] net/sonic: Use MMIO accessors Date: Tue, 28 Jan 2020 15:00:50 +0100 Message-Id: <20200128135829.409513000@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200128135817.238524998@linuxfoundation.org> References: <20200128135817.238524998@linuxfoundation.org> User-Agent: quilt/0.66 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 From: Finn Thain commit e3885f576196ddfc670b3d53e745de96ffcb49ab upstream. The driver accesses descriptor memory which is simultaneously accessed by the chip, so the compiler must not be allowed to re-order CPU accesses. sonic_buf_get() used 'volatile' to prevent that. sonic_buf_put() should have done so too but was overlooked. Fixes: efcce839360f ("[PATCH] macsonic/jazzsonic network drivers update") Tested-by: Stan Johnson Signed-off-by: Finn Thain Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/natsemi/sonic.h | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) --- a/drivers/net/ethernet/natsemi/sonic.h +++ b/drivers/net/ethernet/natsemi/sonic.h @@ -345,30 +345,30 @@ static void sonic_msg_init(struct net_de as far as we can tell. */ /* OpenBSD calls this "SWO". I'd like to think that sonic_buf_put() is a much better name. */ -static inline void sonic_buf_put(void* base, int bitmode, +static inline void sonic_buf_put(u16 *base, int bitmode, int offset, __u16 val) { if (bitmode) #ifdef __BIG_ENDIAN - ((__u16 *) base + (offset*2))[1] = val; + __raw_writew(val, base + (offset * 2) + 1); #else - ((__u16 *) base + (offset*2))[0] = val; + __raw_writew(val, base + (offset * 2) + 0); #endif else - ((__u16 *) base)[offset] = val; + __raw_writew(val, base + (offset * 1) + 0); } -static inline __u16 sonic_buf_get(void* base, int bitmode, +static inline __u16 sonic_buf_get(u16 *base, int bitmode, int offset) { if (bitmode) #ifdef __BIG_ENDIAN - return ((volatile __u16 *) base + (offset*2))[1]; + return __raw_readw(base + (offset * 2) + 1); #else - return ((volatile __u16 *) base + (offset*2))[0]; + return __raw_readw(base + (offset * 2) + 0); #endif else - return ((volatile __u16 *) base)[offset]; + return __raw_readw(base + (offset * 1) + 0); } /* Inlines that you should actually use for reading/writing DMA buffers */