490 	dmaengine_terminate_async(stm32_port->tx_ch);  in stm32_usart_tx_dma_terminate()
644 	desc = dmaengine_prep_slave_single(stm32port->tx_ch,  in stm32_usart_transmit_chars_dma()
672 	dma_async_issue_pending(stm32port->tx_ch);  in stm32_usart_transmit_chars_dma()
731 	if (stm32_port->tx_ch)  in stm32_usart_transmit_chars()
795 	if ((sr & USART_SR_TXE) && !(stm32_port->tx_ch)) {  in stm32_usart_interrupt()
895 	if (stm32_port->tx_ch) {  in stm32_usart_flush_buffer()
1661 	ret = dmaengine_slave_config(stm32port->tx_ch, &config);  in stm32_usart_of_dma_tx_probe()
1704 	stm32port->tx_ch = dma_request_chan(&pdev->dev, "tx");  in stm32_usart_serial_probe()
1705 	if (PTR_ERR(stm32port->tx_ch) == -EPROBE_DEFER) {  in stm32_usart_serial_probe()
1710 	if (IS_ERR(stm32port->tx_ch))  in stm32_usart_serial_probe()
1711 		stm32port->tx_ch = NULL;  in stm32_usart_serial_probe()
1719 	if (stm32port->tx_ch && stm32_usart_of_dma_tx_probe(stm32port, pdev)) {  in stm32_usart_serial_probe()
1721 		dma_release_channel(stm32port->tx_ch);  in stm32_usart_serial_probe()
1722 		stm32port->tx_ch = NULL;  in stm32_usart_serial_probe()
1727 	if (!stm32port->tx_ch)  in stm32_usart_serial_probe()
1749 	if (stm32port->tx_ch) {  in stm32_usart_serial_probe()
1751 		dma_release_channel(stm32port->tx_ch);  in stm32_usart_serial_probe()
1798 	if (stm32_port->tx_ch) {  in stm32_usart_serial_remove()
1800 		dma_release_channel(stm32_port->tx_ch);  in stm32_usart_serial_remove()