[ARM PATCH] 2339/1: Don't mask IRQ_STATUS with IXP2000_VALID_IRQ_MASK

Patch from Deepak Saxena

Supersedes 2226/1

According to the IXP Programmer's Reference Manual, a read from
IRQ_STATUS can only return '1' for IRQ sources that have been
explicitly enabled in IRQ_ENABLE. So if we never enable 'invalid'
IRQ sources, we don't actually have to mask off IRQ_STATUS with
IXP2000_VALID_IRQ_MASK.

Signed-off-by: Deepak Saxena
Signed-off-by: Russell King

include/asm-arm/arch-ixp2000/entry-macro.S

@@ -19,11 +19,6 @@
 		orr	\base, \base, #0x0000a000
 		orr	\base, \base, #0x08
 		ldr	\irqstat, [\base]         @ get interrupts
-		mov	\tmp, #IXP2000_VALID_IRQ_MASK & 0xff000000
-		orr	\tmp, \tmp, #IXP2000_VALID_IRQ_MASK & 0x00ff0000
-		orr	\tmp, \tmp, #IXP2000_VALID_IRQ_MASK & 0x0000ff00
-		orr	\tmp, \tmp, #IXP2000_VALID_IRQ_MASK & 0x000000ff
-		and	\irqstat, \irqstat, \tmp
 
 		cmp	\irqstat, #0
 		beq	1001f