From ee15947cf69a9ab035089670ee76160678eb5aa2 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Thu, 22 Jan 2015 11:50:25 -0500 Subject: [PATCH] serial: 8250_pnp: Enable PNP_CONSOLE for console ports When the kernel command line parameter, no_console_suspend, is used, the console should continue to output console messages during and after system suspend. For a serial console, the serial core ensures that the device is not shutdown when no_console_suspend is specified. However, the default operation of the pnp bus will disable and suspend the device and no further output occurs. When registering the 8250 port, if the serial device is a console set the PNP_CONSOLE capability, which prevents device power-off if consoles are not suspending. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_pnp.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_pnp.c b/drivers/tty/serial/8250/8250_pnp.c index 682a2fbe5c06..50a09cd76d50 100644 --- a/drivers/tty/serial/8250/8250_pnp.c +++ b/drivers/tty/serial/8250/8250_pnp.c @@ -426,7 +426,7 @@ static int serial_pnp_guess_board(struct pnp_dev *dev) static int serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) { - struct uart_8250_port uart; + struct uart_8250_port uart, *port; int ret, line, flags = dev_id->driver_data; if (flags & UNKNOWN_DEV) { @@ -471,6 +471,10 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) if (line < 0 || (flags & CIR_PORT)) return -ENODEV; + port = serial8250_get_port(line); + if (uart_console(&port->port)) + dev->capabilities |= PNP_CONSOLE; + pnp_set_drvdata(dev, (void *)((long)line + 1)); return 0; } @@ -478,6 +482,8 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) static void serial_pnp_remove(struct pnp_dev *dev) { long line = (long)pnp_get_drvdata(dev); + + dev->capabilities &= ~PNP_CONSOLE; if (line) serial8250_unregister_port(line - 1); } -- 2.11.0