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dmaengine: img-mdc-dma: 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 16:32:10 +02:00 committed by Vinod Koul
parent 47d71bc75d
commit 397c59bce6
1 changed files with 12 additions and 5 deletions
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17
drivers/dma/img-mdc-dma.c
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@ -694,7 +694,6 @@ static unsigned int mdc_get_new_events(struct mdc_chan *mchan)
static int mdc_terminate_all(struct dma_chan *chan)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
struct mdc_tx_desc *mdesc;
unsigned long flags;
LIST_HEAD(head);
@ -703,21 +702,28 @@ static int mdc_terminate_all(struct dma_chan *chan)
mdc_chan_writel(mchan, MDC_CONTROL_AND_STATUS_CANCEL,
MDC_CONTROL_AND_STATUS);
mdesc = mchan->desc;
mchan->desc = NULL;
if (mchan->desc) {
vchan_terminate_vdesc(&mchan->desc->vd);
mchan->desc = NULL;
}
vchan_get_all_descriptors(&mchan->vc, &head);
mdc_get_new_events(mchan);
spin_unlock_irqrestore(&mchan->vc.lock, flags);
if (mdesc)
mdc_desc_free(&mdesc->vd);
vchan_dma_desc_free_list(&mchan->vc, &head);
return 0;
}
static void mdc_synchronize(struct dma_chan *chan)
{
struct mdc_chan *mchan = to_mdc_chan(chan);
vchan_synchronize(&mchan->vc);
}
static int mdc_slave_config(struct dma_chan *chan,
struct dma_slave_config *config)
{
@ -952,6 +958,7 @@ static int mdc_dma_probe(struct platform_device *pdev)
mdma->dma_dev.device_tx_status = mdc_tx_status;
mdma->dma_dev.device_issue_pending = mdc_issue_pending;
mdma->dma_dev.device_terminate_all = mdc_terminate_all;
mdma->dma_dev.device_synchronize = mdc_synchronize;
mdma->dma_dev.device_config = mdc_slave_config;
mdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);