[patch 1/1] CATS: Do not try and map bad PCI IRQ numbers | |
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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@xxxxxxxxx>
--- linux-2.6.26-quilt2.orig/arch/arm/mach-footbridge/cats-pci.c 2008-07-23 14:47:59.000000000 +0100
+++ linux-2.6.26-quilt2/arch/arm/mach-footbridge/cats-pci.c 2008-07-23 14:48:17.000000000 +0100
@@ -18,6 +18,9 @@ static int irqmap_cats[] __initdata = {
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;
--
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