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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>
This commit is contained in:
Huang Shijie 2012-04-28 18:15:42 +08:00 committed by Vinod Koul
parent d3f797d93e
commit abd9ccc84c
1 changed files with 7 additions and 2 deletions
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9
drivers/dma/imx-sdma.c
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@ -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