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[ARM] CATS: Do not try and map bad PCI IRQ numbers 

The cats_map_irq() function in the Simtec CATS support
code is mapping IRQ 255 (invalid IRQ) into what is a
supposedly valid interrupt numner which can cause problems
with other devices then seeing an interrupt they cannot
claim.

If the IRQ number if >= 255, then return -1 as this is not
something we can map.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Ben Dooks 2008-08-08 21:22:35 +01:00
parent 2921047594
commit e38d523fd0
1 changed files with 3 additions and 0 deletions
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3
arch/arm/mach-footbridge/cats-pci.c
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@ -18,6 +18,9 @@ static int irqmap_cats[] __initdata = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 };
static int __init cats_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
if (dev->irq >= 255)
return -1; /* not a valid interrupt. */
if (dev->irq >= 128)
return dev->irq & 0x1f;