Messages in this thread Patch in this message | | | From | 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 |
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dma_alloc_coherent memory may be bufferable. We need to add nececcary memory barrier.
Signed-off-by: Richard Zhao <richard.zhao@linaro.org> --- 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
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