From: Sean Young Date: Fri, 22 Feb 2013 16:27:19 +0000 (+0000) Subject: tty/8250_pnp: serial port detection regression since v3.7 X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=77e372a3d82e5e4878ce1962207edd766773cc76;p=openwrt%2Fstaging%2Fblogic.git tty/8250_pnp: serial port detection regression since v3.7 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. Note, the BIOS can also be upgraded, fixing this problem, but for people who can't do that, this fix is needed. Reported-by: Vincent Deffontaines Tested-by: Vincent Deffontaines Signed-off-by: Sean Young Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/8250/8250_pnp.c b/drivers/tty/serial/8250/8250_pnp.c index 35d9ab95c5cb..b3455a970a1d 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);