From mboxrd@z Thu Jan 1 00:00:00 1970 From: richard.zhao@linaro.org (Richard Zhao) Date: Sun, 1 Jan 2012 22:38:12 +0800 Subject: [PATCH v2 2/2] dma/imx-sdma: add wmb before enable a channel In-Reply-To: <1325428692-11473-1-git-send-email-richard.zhao@linaro.org> References: <1325428692-11473-1-git-send-email-richard.zhao@linaro.org> Message-ID: <1325428692-11473-3-git-send-email-richard.zhao@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.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