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dmaengine: dma-jz4780: Use vchan_terminate_vdesc() instead of desc_free 

To avoid race with vchan_complete, use the race free way to terminate
running transfer.

Implement the device_synchronize callback to make sure that the terminated
descriptor is freed.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Peter Ujfalusi 2017-11-14 16:32:08 +02:00 committed by Vinod Koul
parent de92436ac4
commit f0dd52c85d
1 changed files with 9 additions and 1 deletions
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10
drivers/dma/dma-jz4780.c
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@ -511,7 +511,7 @@ static int jz4780_dma_terminate_all(struct dma_chan *chan)
/* Clear the DMA status and stop the transfer. */
jz4780_dma_writel(jzdma, JZ_DMA_REG_DCS(jzchan->id), 0);
if (jzchan->desc) {
jz4780_dma_desc_free(&jzchan->desc->vdesc);
vchan_terminate_vdesc(&jzchan->desc->vdesc);
jzchan->desc = NULL;
}
@ -523,6 +523,13 @@ static int jz4780_dma_terminate_all(struct dma_chan *chan)
return 0;
}
static void jz4780_dma_synchronize(struct dma_chan *chan)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
vchan_synchronize(&jzchan->vchan);
}
static int jz4780_dma_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
@ -813,6 +820,7 @@ static int jz4780_dma_probe(struct platform_device *pdev)
dd->device_prep_dma_memcpy = jz4780_dma_prep_dma_memcpy;
dd->device_config = jz4780_dma_config;
dd->device_terminate_all = jz4780_dma_terminate_all;
dd->device_synchronize = jz4780_dma_synchronize;
dd->device_tx_status = jz4780_dma_tx_status;
dd->device_issue_pending = jz4780_dma_issue_pending;
dd->src_addr_widths = JZ_DMA_BUSWIDTHS;