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powerpc/mpc62xx_pic: Fix get_irq handling of NO_IRQ 

If none of irq category bits were set mpc52xx_get_irq() would pass
NO_IRQ_IGNORE (-1) to irq_linear_revmap, which does an unsigned compare
and declares the interrupt above the linear map range.  It then punts
to irq_find_mapping, which performs a linear search of all irqs,
which will likely miss and only then return NO_IRQ.

If no status bit is set, then we should return NO_IRQ directly.
The interrupt should not be suppressed from spurious counting, in fact
that is the definition of supurious.

Signed-off-by: Milton Miller <miltonm@bga.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Milton Miller 2011-05-10 19:30:18 +00:00 committed by Benjamin Herrenschmidt
parent c42385cd45
commit 67347eba15
1 changed files with 3 additions and 1 deletions
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4
arch/powerpc/platforms/52xx/mpc52xx_pic.c
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@ -486,7 +486,7 @@ void __init mpc52xx_init_irq(void)
unsigned int mpc52xx_get_irq(void)
{
u32 status;
int irq = NO_IRQ_IGNORE;
int irq;
status = in_be32(&intr->enc_status);
if (status & 0x00000400) { /* critical */
@ -509,6 +509,8 @@ unsigned int mpc52xx_get_irq(void)
} else {
irq |= (MPC52xx_IRQ_L1_PERP << MPC52xx_IRQ_L1_OFFSET);
}
} else {
return NO_IRQ;
}
return irq_linear_revmap(mpc52xx_irqhost, irq);