PCI: epf-test: Use dmaengine_submit() to initiate DMA transfer

Instead of an open coded call to the tx_submit() operation of struct
dma_async_tx_descriptor, use the helper function dmaengine_submit().
No functional change is introduced with this.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Damien Le Moal <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>

Author: damien-lemoal

drivers/pci/endpoint/functions/pci-epf-test.c

@@ -163,7 +163,7 @@ static int pci_epf_test_data_transfer(struct pci_epf_test *epf_test,
 	epf_test->transfer_chan = chan;
 	tx->callback = pci_epf_test_dma_callback;
 	tx->callback_param = epf_test;
-	epf_test->transfer_cookie = tx->tx_submit(tx);
+	epf_test->transfer_cookie = dmaengine_submit(tx);
 
 	ret = dma_submit_error(epf_test->transfer_cookie);
 	if (ret) {