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authorHuang Shijie <b32955@freescale.com>2012-04-28 18:15:42 +0800
committerVinod Koul <vinod.koul@linux.intel.com>2012-05-11 11:08:10 +0530
commitabd9ccc84c35cf1e296335a7b655bba40c92386c (patch)
tree22c39af6cc57d6371cf4d74e76c04c60f979e9b5 /drivers/dma/imx-sdma.c
parentd3f797d93e593aa891f5b04a404b4ab45fd0e66a (diff)
downloadop-kernel-dev-abd9ccc84c35cf1e296335a7b655bba40c92386c.zip
op-kernel-dev-abd9ccc84c35cf1e296335a7b655bba40c92386c.tar.gz
dma: imx-sdma: keep the callbacks invoked in the tasklet
The current code keeps the callbacks invoked from interrupt context, this does not conform to the Documentation/dmaengine.txt. So add tasklet support to fix this issue. Signed-off-by: Huang Shijie <b32955@freescale.com> Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Diffstat (limited to 'drivers/dma/imx-sdma.c')
-rw-r--r--drivers/dma/imx-sdma.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index d3e38e2..5a45777 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -271,6 +271,7 @@ struct sdma_channel {
enum dma_status status;
unsigned int chn_count;
unsigned int chn_real_count;
+ struct tasklet_struct tasklet;
};
#define IMX_DMA_SG_LOOP BIT(0)
@@ -534,8 +535,10 @@ static void mxc_sdma_handle_channel_normal(struct sdma_channel *sdmac)
sdmac->desc.callback(sdmac->desc.callback_param);
}
-static void mxc_sdma_handle_channel(struct sdma_channel *sdmac)
+static void sdma_tasklet(unsigned long data)
{
+ struct sdma_channel *sdmac = (struct sdma_channel *) data;
+
complete(&sdmac->done);
/* not interested in channel 0 interrupts */
@@ -560,7 +563,7 @@ static irqreturn_t sdma_int_handler(int irq, void *dev_id)
int channel = fls(stat) - 1;
struct sdma_channel *sdmac = &sdma->channel[channel];
- mxc_sdma_handle_channel(sdmac);
+ tasklet_schedule(&sdmac->tasklet);
__clear_bit(channel, &stat);
}
@@ -1359,6 +1362,8 @@ static int __init sdma_probe(struct platform_device *pdev)
dma_cookie_init(&sdmac->chan);
sdmac->channel = i;
+ tasklet_init(&sdmac->tasklet, sdma_tasklet,
+ (unsigned long) sdmac);
/*
* Add the channel to the DMAC list. Do not add channel 0 though
* because we need it internally in the SDMA driver. This also means
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