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>

1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/dma/img-mdc-dma.c b/drivers/dma/img-mdc-dma.c
index 0391f930aecc..25cec9c243e1 100644
--- a/drivers/dma/img-mdc-dma.c
+++ b/drivers/dma/img-mdc-dma.c
@@ -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);