ARM: 7177/1: GIC: avoid skipping non-existent PPIs in irq_start calculation
Commit 4294f8baa ("ARM: gic: add irq_domain support") defines irq_start
as irq_start = (irq_start & ~31) + 16; On a platform with a GIC and a
CPU without PPIs, this results in irq_start being off by 16.
This patch fixes gic_init so that we only carve out a PPI space when
PPIs exist for the GIC being initialised.
Cc: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index 43240f3..410a546 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -582,13 +582,16 @@
* For primary GICs, skip over SGIs.
* For secondary GICs, skip over PPIs, too.
*/
+ domain->hwirq_base = 32;
if (gic_nr == 0) {
gic_cpu_base_addr = cpu_base;
- domain->hwirq_base = 16;
- if (irq_start > 0)
- irq_start = (irq_start & ~31) + 16;
- } else
- domain->hwirq_base = 32;
+
+ if ((irq_start & 31) > 0) {
+ domain->hwirq_base = 16;
+ if (irq_start != -1)
+ irq_start = (irq_start & ~31) + 16;
+ }
+ }
/*
* Find out how many interrupts are supported.