607 	dmaengine_terminate_async(stm32_port->tx_ch);  in stm32_usart_tx_dma_terminate()
625 	return stm32_usart_dma_pause_resume(stm32_port, stm32_port->tx_ch,  in stm32_usart_tx_dma_pause()
633 	return stm32_usart_dma_pause_resume(stm32_port, stm32_port->tx_ch,  in stm32_usart_tx_dma_resume()
739 	desc = dmaengine_prep_slave_single(stm32port->tx_ch,  in stm32_usart_transmit_chars_dma()
769 	dma_async_issue_pending(stm32port->tx_ch);  in stm32_usart_transmit_chars_dma()
827 	if (stm32_port->tx_ch)  in stm32_usart_transmit_chars()
896 	if ((sr & USART_SR_TXE) && !(stm32_port->tx_ch)) {  in stm32_usart_interrupt()
983 	if (stm32_port->tx_ch)  in stm32_usart_flush_buffer()
1115 	if (stm32_port->tx_ch)  in stm32_usart_shutdown()
1355 	if (stm32_port->tx_ch)  in stm32_usart_set_termios()
1757 	ret = dmaengine_slave_config(stm32port->tx_ch, &config);  in stm32_usart_of_dma_tx_probe()
1788 	stm32port->tx_ch = dma_request_chan(&pdev->dev, "tx");  in stm32_usart_serial_probe()
1789 	if (PTR_ERR(stm32port->tx_ch) == -EPROBE_DEFER) {  in stm32_usart_serial_probe()
1794 	if (IS_ERR(stm32port->tx_ch))  in stm32_usart_serial_probe()
1795 		stm32port->tx_ch = NULL;  in stm32_usart_serial_probe()
1814 	if (stm32port->tx_ch && stm32_usart_of_dma_tx_probe(stm32port, pdev)) {  in stm32_usart_serial_probe()
1816 		dma_release_channel(stm32port->tx_ch);  in stm32_usart_serial_probe()
1817 		stm32port->tx_ch = NULL;  in stm32_usart_serial_probe()
1822 	if (!stm32port->tx_ch)  in stm32_usart_serial_probe()
1844 	if (stm32port->tx_ch)  in stm32_usart_serial_probe()
1859 	if (stm32port->tx_ch)  in stm32_usart_serial_probe()
1860 		dma_release_channel(stm32port->tx_ch);  in stm32_usart_serial_probe()
1885 	if (stm32_port->tx_ch) {  in stm32_usart_serial_remove()
1887 		dma_release_channel(stm32_port->tx_ch);  in stm32_usart_serial_remove()