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=-9.8 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 830E9C433E0 for ; Tue, 9 Jun 2020 17:46:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4ABF020801 for ; Tue, 9 Jun 2020 17:46:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591724799; bh=HtOKJ+6AhzRcJp42rN8vMCosQZR/IW/NBwTb7UtPEfQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kxfzO7Qj6Q2uLVzHrn+UGcXhomuJ+5xHWjAGQddUIsRqWNebFbpZFucxyKkTC7srA EfI5tTC8jcBSN2TGV7vigcQQ61DfQJJKE7vR4RLdbaNW1F3Et7Le93zUd/hTll/DSd Im/RR8yTGHVsdlHaogOVvCaCksNSYl6oBimjGvQs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731983AbgFIRqh (ORCPT ); Tue, 9 Jun 2020 13:46:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:56408 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731928AbgFIRq0 (ORCPT ); Tue, 9 Jun 2020 13:46:26 -0400 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 59A972081A; Tue, 9 Jun 2020 17:46:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591724784; bh=HtOKJ+6AhzRcJp42rN8vMCosQZR/IW/NBwTb7UtPEfQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rclGf4Y3iN4zmI1W7O73mS+Rzjzby9epkvo98b0keK2AR+dzeHRJ9I0hsufxswY0j OuuPFl6Xo/eKHiRFdR3a5x0i0ic9CkvLlShc0yDhC2ZZ68Uf2BspiS1MCv9njNROEv cOCXDZ9n15rdULmdQ7lHk0xieLRjNqVi4ude1Usg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, fengsheng , Xinwei Kong , Mark Brown , Sasha Levin Subject: [PATCH 4.4 07/36] spi: dw: use "smp_mb()" to avoid sending spi data error Date: Tue, 9 Jun 2020 19:44:07 +0200 Message-Id: <20200609173933.708823642@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200609173933.288044334@linuxfoundation.org> References: <20200609173933.288044334@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: Xinwei Kong [ Upstream commit bfda044533b213985bc62bd7ca96f2b984d21b80 ] Because of out-of-order execution about some CPU architecture, In this debug stage we find Completing spi interrupt enable -> prodrucing TXEI interrupt -> running "interrupt_transfer" function will prior to set "dw->rx and dws->rx_end" data, so this patch add memory barrier to enable dw->rx and dw->rx_end to be visible and solve to send SPI data error. eg: it will fix to this following low possibility error in testing environment which using SPI control to connect TPM Modules kernel: tpm tpm0: Operation Timed out kernel: tpm tpm0: tpm_relinquish_locality: : error -1 Signed-off-by: fengsheng Signed-off-by: Xinwei Kong Link: https://lore.kernel.org/r/1578019930-55858-1-git-send-email-kong.kongxinwei@hisilicon.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-dw.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 4edd38d03b93..5688591e9cd3 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -306,6 +306,9 @@ static int dw_spi_transfer_one(struct spi_master *master, dws->len = transfer->len; spin_unlock_irqrestore(&dws->buf_lock, flags); + /* Ensure dw->rx and dw->rx_end are visible */ + smp_mb(); + spi_enable_chip(dws, 0); /* Handle per transfer options for bpw and speed */ -- 2.25.1