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serial: only use PNP IRQ if it's valid

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"Luming Yu" <luming.yu@gmail.com> says:

  There is a "ttyS1 irq is -1" problem observed on tiger4 which cause the
  serial port broken.

  It is because that there is __no__ ACPI IRQ resource assigned for the
  serial port.  So the value of the IRQ for the port is never changed since it
  got initialized to -1.

If PNP supplies a valid IRQ, use it.  Otherwise, leave port.irq == 0, which
means "no IRQ" to the serial core.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Yu Luming <luming.yu@intel.com>
Acked-by: Matthew Wilcox <matthew@wil.cx>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bjorn Helgaas 2007-11-14 16:59:59 -08:00 committed by Linus Torvalds
parent 57510c2f93
commit e02f5f52ca
1 changed files with 2 additions and 1 deletions
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3
drivers/serial/8250_pnp.c
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@ -439,7 +439,8 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
}
memset(&port, 0, sizeof(struct uart_port));
port.irq = pnp_irq(dev, 0);
if (pnp_irq_valid(dev, 0))
port.irq = pnp_irq(dev, 0);
if (pnp_port_valid(dev, 0)) {
port.iobase = pnp_port_start(dev, 0);
port.iotype = UPIO_PORT;