tty/serial_core: Introduce lock mechanism for RS485
Introduce an homogeneous lock system between setting and using the rs485
data of the uart_port.
This patch should not be split into multiple ones in order to avoid
leaving the tree in an unstable state.
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Reviewed-by: Alan Cox <alan@linux.intel.com>
Suggested-by: Alan Cox <alan@linux.intel.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 80c4bfc..2cb0413 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -294,9 +294,6 @@
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
unsigned int mode;
- unsigned long flags;
-
- spin_lock_irqsave(&port->lock, flags);
/* Disable interrupts */
UART_PUT_IDR(port, atmel_port->tx_done_mask);
@@ -327,8 +324,6 @@
/* Enable interrupts */
UART_PUT_IER(port, atmel_port->tx_done_mask);
- spin_unlock_irqrestore(&port->lock, flags);
-
return 0;
}
@@ -2533,6 +2528,7 @@
struct atmel_uart_data *pdata = dev_get_platdata(&pdev->dev);
void *data;
int ret = -ENODEV;
+ bool rs485_enabled;
BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));
@@ -2580,6 +2576,8 @@
port->rx_ring.buf = data;
}
+ rs485_enabled = port->uart.rs485.flags & SER_RS485_ENABLED;
+
ret = uart_add_one_port(&atmel_uart, &port->uart);
if (ret)
goto err_add_port;
@@ -2598,7 +2596,7 @@
device_init_wakeup(&pdev->dev, 1);
platform_set_drvdata(pdev, port);
- if (port->uart.rs485.flags & SER_RS485_ENABLED) {
+ if (rs485_enabled) {
UART_PUT_MR(&port->uart, ATMEL_US_USMODE_NORMAL);
UART_PUT_CR(&port->uart, ATMEL_US_RTSEN);
}