dmaengine: pch_dma: convert callback to helper function

This is in preperation of moving to a callback that provides results to the
callback for the transaction. The conversion will maintain current behavior
and the driver must convert to new callback mechanism at a later time in
order to receive results.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c
index 113605f6fe20..df95727dc2fb 100644
--- a/drivers/dma/pch_dma.c
+++ b/drivers/dma/pch_dma.c
@@ -357,14 +357,13 @@ static void pdc_chain_complete(struct pch_dma_chan *pd_chan,
                                struct pch_dma_desc *desc)
 {
         struct dma_async_tx_descriptor *txd = &desc->txd;
-        dma_async_tx_callback callback = txd->callback;
-        void *param = txd->callback_param;
+        struct dmaengine_desc_callback cb;
 
+        dmaengine_desc_get_callback(txd, &cb);
         list_splice_init(&desc->tx_list, &pd_chan->free_list);
         list_move(&desc->desc_node, &pd_chan->free_list);
 
-        if (callback)
-                callback(param);
+        dmaengine_desc_callback_invoke(&cb, NULL);
 }
 
 static void pdc_complete_all(struct pch_dma_chan *pd_chan)