[PATCH 3/3] tty/serial: atmel: manage shutdown in case of RS485 or ISO7816 mode
From: Ludovic Desroches <ludovic.desroches@microchip.com>
Date: 2018-07-11 13:30:12
Also in:
linux-arch, linux-arm-kernel, lkml
Subsystem:
microchip at91 serial driver, the rest, tty layer and serial drivers · Maintainers:
Richard Genoud, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
From: Nicolas Ferre <nicolas.ferre@microchip.com> In atmel_shutdown() we call atmel_stop_rx() and atmel_stop_tx() functions. Prevent the rx restart that is implemented in RS485 or ISO7816 modes when calling atmel_stop_tx() by using the atomic information tasklet_shutdown that is already in place for this purpose. Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com> --- drivers/tty/serial/atmel_serial.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 0118b219f3a8..e4f877e1f3c6 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c@@ -617,7 +617,9 @@ static void atmel_stop_tx(struct uart_port *port) if (((port->rs485.flags & SER_RS485_ENABLED) && !(port->rs485.flags & SER_RS485_RX_DURING_TX)) || port->iso7816.flags & SER_ISO7816_ENABLED) - atmel_start_rx(port); + if (!atomic_read(&atmel_port->tasklet_shutdown)) + atmel_start_rx(port); + } /*
--
2.12.2