368 	dmaengine_terminate_async(stm32_port->tx_ch);  in stm32_usart_tx_dma_terminate()
558 	desc = dmaengine_prep_slave_single(stm32port->tx_ch,  in stm32_usart_transmit_chars_dma()
586 	dma_async_issue_pending(stm32port->tx_ch);  in stm32_usart_transmit_chars_dma()
645 	if (stm32_port->tx_ch)  in stm32_usart_transmit_chars()
709 	if ((sr & USART_SR_TXE) && !(stm32_port->tx_ch)) {  in stm32_usart_interrupt()
820 	if (stm32_port->tx_ch) {  in stm32_usart_flush_buffer()
1578 	ret = dmaengine_slave_config(stm32port->tx_ch, &config);  in stm32_usart_of_dma_tx_probe()
1621 	stm32port->tx_ch = dma_request_chan(&pdev->dev, "tx");  in stm32_usart_serial_probe()
1622 	if (PTR_ERR(stm32port->tx_ch) == -EPROBE_DEFER) {  in stm32_usart_serial_probe()
1627 	if (IS_ERR(stm32port->tx_ch))  in stm32_usart_serial_probe()
1628 		stm32port->tx_ch = NULL;  in stm32_usart_serial_probe()
1636 	if (stm32port->tx_ch && stm32_usart_of_dma_tx_probe(stm32port, pdev)) {  in stm32_usart_serial_probe()
1638 		dma_release_channel(stm32port->tx_ch);  in stm32_usart_serial_probe()
1639 		stm32port->tx_ch = NULL;  in stm32_usart_serial_probe()
1644 	if (!stm32port->tx_ch)  in stm32_usart_serial_probe()
1666 	if (stm32port->tx_ch) {  in stm32_usart_serial_probe()
1668 		dma_release_channel(stm32port->tx_ch);  in stm32_usart_serial_probe()
1715 	if (stm32_port->tx_ch) {  in stm32_usart_serial_remove()
1717 		dma_release_channel(stm32_port->tx_ch);  in stm32_usart_serial_remove()