diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_port.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 2d8f87f4e40f..ecfcdc02eeaf 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -2150,7 +2150,12 @@ int serial8250_do_startup(struct uart_port *port) serial8250_rpm_get(up); if (port->type == PORT_16C950) { - /* Wake up and initialize UART */ + /* + * Wake up and initialize UART + * + * Synchronize UART_IER access against the console. + */ + spin_lock_irqsave(&port->lock, flags); up->acr = 0; serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); serial_port_out(port, UART_EFR, UART_EFR_ECB); @@ -2160,12 +2165,19 @@ int serial8250_do_startup(struct uart_port *port) serial_port_out(port, UART_LCR, UART_LCR_CONF_MODE_B); serial_port_out(port, UART_EFR, UART_EFR_ECB); serial_port_out(port, UART_LCR, 0); + spin_unlock_irqrestore(&port->lock, flags); } if (port->type == PORT_DA830) { - /* Reset the port */ + /* + * Reset the port + * + * Synchronize UART_IER access against the console. + */ + spin_lock_irqsave(&port->lock, flags); serial_port_out(port, UART_IER, 0); serial_port_out(port, UART_DA830_PWREMU_MGMT, 0); + spin_unlock_irqrestore(&port->lock, flags); mdelay(10); /* Enable Tx, Rx and free run mode */ @@ -2276,6 +2288,8 @@ int serial8250_do_startup(struct uart_port *port) * this interrupt whenever the transmitter is idle and * the interrupt is enabled. Delays are necessary to * allow register changes to become visible. + * + * Synchronize UART_IER access against the console. */ spin_lock_irqsave(&port->lock, flags); |