dmaengine: ioatdma: 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>

drivers/dma/ioat/dma.c

@@ -570,11 +570,9 @@ static void __cleanup(struct ioatdma_chan *ioat_chan, dma_addr_t phys_complete)
 		if (tx->cookie) {
 			dma_cookie_complete(tx);
 			dma_descriptor_unmap(tx);
-			if (tx->callback) {
-				tx->callback(tx->callback_param);
+			dmaengine_desc_get_callback_invoke(tx, NULL);
 			tx->callback = NULL;
 		}
-		}
 
 		if (tx->phys == phys_complete)
 			seen_current = true;
@@ -707,12 +705,10 @@ static void ioat_eh(struct ioatdma_chan *ioat_chan)
 		if (tx->cookie) {
 			dma_cookie_complete(tx);
 			dma_descriptor_unmap(tx);
-			if (tx->callback) {
-				tx->callback(tx->callback_param);
+			dmaengine_desc_get_callback_invoke(tx, NULL);
 			tx->callback = NULL;
 		}
 	}
-	}
 
 	writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
 	pci_write_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, chanerr_int);