Prior to the addition of irq_domain_push_irq(), the hierarchy
IRQ domain always allocates IRQs from the outer-most domain.
Each irqchip usually calls irq_domain_alloc_irqs_parent(),
ascending the topology up to the root irqchip.
The brand-new function irq_domain_push_irq() allows us to allocate
IRQs for parent domain first, then add a child irq_data to the
tail of the chain.
For the new use-case, if the parent sets a temporary trigger type,
it may differ from the type requested to the outer-most irqchip,
then irq_create_fwspec_mapping() warns "type mismatch, failed to map..."
Clear the trigger type when a new irq_data is connected to the chain.
Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
---
Changes in v4:
- Newly added
kernel/irq/irqdomain.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index da3e0b6..18d11b9 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1532,6 +1532,9 @@ int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg)
tail_irq_data->chip = NULL;
tail_irq_data->chip_data = NULL;
+ /* clear the trigger type to avoid "type mismatch" error */
+ irqd_set_trigger_type(tail_irq_data, IRQ_TYPE_NONE);
+
/* May (probably does) set hwirq, chip, etc. */
rv = irq_domain_alloc_irqs_hierarchy(domain, virq, 1, arg);
if (rv) {
--
2.7.4
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