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powerpc/mpic: Fix allocation of reverse-map for multi-ISU mpics 

When using a multi-ISU MPIC, we can interrupts up to
isu_size * MPIC_MAX_ISU, not just isu_size, so allocate
the right size reverse map.

Without this, the code will constantly fallback to
a linear search.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2012-02-22 13:50:13 +00:00
parent f851013cb2
commit fe83364f0b
1 changed files with 6 additions and 2 deletions
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8
arch/powerpc/sysdev/mpic.c
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@ -1331,9 +1331,13 @@ struct mpic * __init mpic_alloc(struct device_node *node,
/*
* By default, the last source number comes from the MPIC, but the
* device-tree and board support code can override it on buggy hw.
* If we get passed an isu_size (multi-isu MPIC) then we use that
* as a default instead of the value read from the HW.
*/
last_irq = (greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
>> MPIC_GREG_FEATURE_LAST_SRC_SHIFT;
>> MPIC_GREG_FEATURE_LAST_SRC_SHIFT;
if (isu_size)
last_irq = isu_size * MPIC_MAX_ISU - 1;
of_property_read_u32(mpic->node, "last-interrupt-source", &last_irq);
if (irq_count)
last_irq = irq_count - 1;
@ -1352,7 +1356,7 @@ struct mpic * __init mpic_alloc(struct device_node *node,
mpic->isu_mask = (1 << mpic->isu_shift) - 1;
mpic->irqhost = irq_alloc_host(mpic->node, IRQ_HOST_MAP_LINEAR,
mpic->isu_size, &mpic_host_ops,
last_irq + 1, &mpic_host_ops,
intvec_top + 1);
/*