Commit e38d523f authored Aug 08, 2008 by Ben Dooks

[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>

parent 29210475

arch/arm/mach-footbridge/cats-pci.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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;