From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752869Ab2AAOjO (ORCPT ); Sun, 1 Jan 2012 09:39:14 -0500 Received: from mail-iy0-f174.google.com ([209.85.210.174]:37761 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752711Ab2AAOiz (ORCPT ); Sun, 1 Jan 2012 09:38:55 -0500 From: Richard Zhao To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: kernel@pengutronix.de, shawn.guo@linaro.org, vinod.koul@intel.com, dan.j.williams@intel.com, eric.miao@linaro.org, patches@linaro.org, Richard Zhao Subject: [PATCH v2 2/2] dma/imx-sdma: add wmb before enable a channel Date: Sun, 1 Jan 2012 22:38:12 +0800 Message-Id: <1325428692-11473-3-git-send-email-richard.zhao@linaro.org> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1325428692-11473-1-git-send-email-richard.zhao@linaro.org> References: <1325428692-11473-1-git-send-email-richard.zhao@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org dma_alloc_coherent memory may be bufferable. We need to add nececcary memory barrier. Signed-off-by: Richard Zhao --- drivers/dma/imx-sdma.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index f8e87b5..9301bff 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -394,6 +394,7 @@ static int sdma_config_ownership(struct sdma_channel *sdmac, static void sdma_enable_channel(struct sdma_engine *sdma, int channel) { + wmb(); __raw_writel(1 << channel, sdma->regs + SDMA_H_START); } -- 1.7.4.1