On Wed, May 11, 2011 at 7:30 AM, Milton Miller <milt...@bga.com> wrote:
> 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 <milt...@bga.com>
Acked-by: Grant Likely <grant.lik...@secretlab.ca>
> ---
> ---
> arch/powerpc/platforms/52xx/mpc52xx_pic.c | 4 +++-
> 1 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pic.c
> b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
> index bb61181..1a9a495 100644
> --- a/arch/powerpc/platforms/52xx/mpc52xx_pic.c
> +++ b/arch/powerpc/platforms/52xx/mpc52xx_pic.c
> @@ -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);
> --
> 1.7.0.4
>
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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