From patchwork Mon Feb 3 16:19:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 232090 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 9BAA2C3524D for ; Mon, 3 Feb 2020 16:47:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7267120838 for ; Mon, 3 Feb 2020 16:47:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580748470; bh=RMVr5lbZNUQ5PLSw+ZOShgdvCLUUmzfmSdmzJ+42/WY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=wp8mg5pLnTlnQ/15fSq0GtxBK1kOdBepcRwoQidyjaKFRh6N0UPkWIhZJJv9aelIl y4roFWkfHOP57W784iRb0H/gvwuz5hERXyEvXH538Dsme5grrzvLX/6pFC1fiYHIAt 9mwk+Cx5iVqqV6Yr5hMj/V78DlhbunOQd5e3FHGo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728217AbgBCQ1G (ORCPT ); Mon, 3 Feb 2020 11:27:06 -0500 Received: from mail.kernel.org ([198.145.29.99]:38204 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729320AbgBCQ1D (ORCPT ); Mon, 3 Feb 2020 11:27:03 -0500 Received: from localhost (unknown [104.132.45.99]) (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 0FBAD2080C; Mon, 3 Feb 2020 16:27:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580747222; bh=RMVr5lbZNUQ5PLSw+ZOShgdvCLUUmzfmSdmzJ+42/WY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fAdZLVaqokJzuy1cqmjh0IFKxzN+gIpLw1WcIV2xU0tXyf6gruiYOfH0gcigWQ/8A HkzuJd4sUJ4ujVHFFGgKcUOVs1VKowDur0CYbB6gLGUzTytjhCp3wwXzmI6MOyAhz+ 5TJJodzEkMw1zVPM41FUTqAqHEw0Zu1edK69xyXk= 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" , Sasha Levin Subject: [PATCH 4.9 63/68] net/sonic: Use MMIO accessors Date: Mon, 3 Feb 2020 16:19:59 +0000 Message-Id: <20200203161915.228280155@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200203161904.705434837@linuxfoundation.org> References: <20200203161904.705434837@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: Finn Thain [ Upstream commit e3885f576196ddfc670b3d53e745de96ffcb49ab ] 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: Sasha Levin --- drivers/net/ethernet/natsemi/sonic.h | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/natsemi/sonic.h b/drivers/net/ethernet/natsemi/sonic.h index 1fd61d7f79bcb..a009a99c0e544 100644 --- a/drivers/net/ethernet/natsemi/sonic.h +++ b/drivers/net/ethernet/natsemi/sonic.h @@ -342,30 +342,30 @@ static void sonic_tx_timeout(struct net_device *dev); 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 */