[PATCH 2/4] serial: 8250: Copy mctrl when register port.

[Giulio Benetti]

RS485 can modify mctrl on startup, especially when RTS_AFTER_SEND is on
TIOCM_RTS is set, then need to keep it set when registering port.

Copy mctrl to new port too.

Signed-off-by: Giulio Benetti <giulio.bene...@micronovasrl.com>
---
 drivers/tty/serial/8250/8250_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/8250/8250_core.c 
b/drivers/tty/serial/8250/8250_core.c
index c8c2b260c681..c8e62fbd6570 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -993,6 +993,7 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
                uart->port.unthrottle   = up->port.unthrottle;
                uart->port.rs485_config = up->port.rs485_config;
                uart->port.rs485        = up->port.rs485;
+               uart->port.mctrl        = up->port.mctrl;
                uart->dma               = up->dma;
                uart->em485             = up->em485;
 
-- 
2.17.1