From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sean Young Subject: [PATCH] tty/8250_pnp: serial port detection regression since v3.7 Date: Fri, 22 Feb 2013 16:27:19 +0000 Message-ID: <1361550439-23504-1-git-send-email-sean@mess.org> Return-path: Sender: stable-owner@vger.kernel.org To: Greg Kroah-Hartman , Jiri Slaby , linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Vincent Deffontaines , Alan Cox , stable@vger.kernel.org List-Id: linux-serial@vger.kernel.org The InsydeH2O BIOS (version dated 09/12/2011) has the following in its pnp resouces for its serial ports: $ cat /sys/bus/pnp/devices/00:0b/resources state = active io disabled irq disabled We do not check if the resources are disabled, and create a bogus ttyS* device. Since commit 835d844d1a28e (8250_pnp: do pnp probe before legacy probe) we get a bogus ttyS0, which prevents the legacy probe from detecting it. Reported-by: Vincent Deffontaines Tested-by: Vincent Deffontaines Signed-off-by: Sean Young Cc: stable@vger.kernel.org --- drivers/tty/serial/8250/8250_pnp.c | 12 +++++++----- 1 files changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/tty/serial/8250/8250_pnp.c b/drivers/tty/serial/8250/8250_pnp.c index 35d9ab9..b3455a9 100644 --- a/drivers/tty/serial/8250/8250_pnp.c +++ b/drivers/tty/serial/8250/8250_pnp.c @@ -429,6 +429,7 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) { struct uart_8250_port uart; int ret, line, flags = dev_id->driver_data; + struct resource *res = NULL; if (flags & UNKNOWN_DEV) { ret = serial_pnp_guess_board(dev); @@ -439,11 +440,12 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id) memset(&uart, 0, sizeof(uart)); if (pnp_irq_valid(dev, 0)) uart.port.irq = pnp_irq(dev, 0); - if ((flags & CIR_PORT) && pnp_port_valid(dev, 2)) { - uart.port.iobase = pnp_port_start(dev, 2); - uart.port.iotype = UPIO_PORT; - } else if (pnp_port_valid(dev, 0)) { - uart.port.iobase = pnp_port_start(dev, 0); + if ((flags & CIR_PORT) && pnp_port_valid(dev, 2)) + res = pnp_get_resource(dev, IORESOURCE_IO, 2); + else if (pnp_port_valid(dev, 0)) + res = pnp_get_resource(dev, IORESOURCE_IO, 0); + if (pnp_resource_enabled(res)) { + uart.port.iobase = res->start; uart.port.iotype = UPIO_PORT; } else if (pnp_mem_valid(dev, 0)) { uart.port.mapbase = pnp_mem_start(dev, 0); -- 1.7.2.5