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Subject[PATCH v4 2/4] x86/devicetree: Fix device IRQ settings in DT
IRQ parameters for the SoC devices connected directly to I/O APIC lines
(without PCI IRQ routing) may be specified in the Device Tree.
Called from DT IRQ parser, irq_create_fwspec_mapping() calls
irq_domain_alloc_irqs() with a pointer to irq_fwspec structure as @arg.
But x86-specific DT IRQ allocation code casts @arg to of_phandle_args
structure pointer and crashes trying to read the IRQ parameters.

Signed-off-by: Ivan Gorinov <ivan.gorinov@intel.com>
---
arch/x86/kernel/devicetree.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
index 63d2ebc..5cd387f 100644
--- a/arch/x86/kernel/devicetree.c
+++ b/arch/x86/kernel/devicetree.c
@@ -195,19 +195,22 @@ static struct of_ioapic_type of_ioapic_type[] =
static int dt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
- struct of_phandle_args *irq_data = (void *)arg;
+ struct irq_fwspec *fwspec = (struct irq_fwspec *)arg;
struct of_ioapic_type *it;
struct irq_alloc_info tmp;
+ int type_index;

- if (WARN_ON(irq_data->args_count < 2))
+ if (WARN_ON(fwspec->param_count < 2))
return -EINVAL;
- if (irq_data->args[1] >= ARRAY_SIZE(of_ioapic_type))
+
+ type_index = fwspec->param[1];
+ if (type_index >= ARRAY_SIZE(of_ioapic_type))
return -EINVAL;

- it = &of_ioapic_type[irq_data->args[1]];
+ it = &of_ioapic_type[type_index];
ioapic_set_alloc_attr(&tmp, NUMA_NO_NODE, it->trigger, it->polarity);
tmp.ioapic_id = mpc_ioapic_id(mp_irqdomain_ioapic_idx(domain));
- tmp.ioapic_pin = irq_data->args[0];
+ tmp.ioapic_pin = fwspec->param[0];

return mp_irqdomain_alloc(domain, virq, nr_irqs, &tmp);
}
--
2.7.4
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