From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751591AbeDFSQD (ORCPT ); Fri, 6 Apr 2018 14:16:03 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:58638 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751201AbeDFSQB (ORCPT ); Fri, 6 Apr 2018 14:16:01 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 904B860C64 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=okaya@codeaurora.org Subject: Re: [PATCH v3 2/2] MIPS: io: add a barrier after register read in readX() To: linux-mips@linux-mips.org, arnd@arndb.de, timur@codeaurora.org, sulrich@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Ralf Baechle , James Hogan , Paul Burton , linux-kernel@vger.kernel.org References: <1522760109-16497-1-git-send-email-okaya@codeaurora.org> <1522760109-16497-2-git-send-email-okaya@codeaurora.org> <41e184ae-689e-93c9-7b15-0c68bd624130@codeaurora.org> From: Sinan Kaya Message-ID: Date: Fri, 6 Apr 2018 14:15:57 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <41e184ae-689e-93c9-7b15-0c68bd624130@codeaurora.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/5/2018 9:34 PM, Sinan Kaya wrote: > On 4/3/2018 8:55 AM, Sinan Kaya wrote: >> While a barrier is present in writeX() function before the register write, >> a similar barrier is missing in the readX() function after the register >> read. This could allow memory accesses following readX() to observe >> stale data. >> >> Signed-off-by: Sinan Kaya >> Reported-by: Arnd Bergmann >> --- >> arch/mips/include/asm/io.h | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h >> index fd00ddaf..6ac502f 100644 >> --- a/arch/mips/include/asm/io.h >> +++ b/arch/mips/include/asm/io.h >> @@ -377,6 +377,7 @@ static inline type pfx##read##bwlq(const volatile void __iomem *mem) \ >> BUG(); \ >> } \ >> \ >> + rmb(); \ >> return pfx##ioswab##bwlq(__mem, __val); \ >> } >> >> > > Can we get these merged to 4.17? > > There was a consensus to fix the architectures having API violation issues. > https://www.mail-archive.com/netdev@vger.kernel.org/msg225971.html > > Any news on the MIPS front? Is this something that Arnd can merge? or does it have to go through the MIPS tree. It feels like the MIPS is dead since nobody replied to me in the last few weeks on a very important topic. -- Sinan Kaya Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.