[PATCH v2] irqdomain: factorise irq_domain_xlate_onetwocell()

[Sebastian Frias <sf84@laposte.net>]

Commit 16b2e6e2f31d ("irq_domain: Create common xlate functions that device
drivers can use") introduced three similar functions:

irq_domain_xlate_onecell()
irq_domain_xlate_twocell()
irq_domain_xlate_onetwocell()

yet the last one, irq_domain_xlate_onetwocell(), can be factored to use the
two previous ones to avoid code duplication.

Fixes: 16b2e6e2f31d ("irq_domain: Create common xlate functions that device
drivers can use")

Signed-off-by: Sebastian Frias <sf84@laposte.net>
---

NOTE: the factored code is not strictly the same in the sense that
16b2e6e2f31d returns "intspec[1]" as 'out_type', while this patch would
make it return "intspec[1] & IRQ_TYPE_SENSE_MASK".

Feel free to comment on that matter.

---
 kernel/irq/irqdomain.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index bee8b02..125a28c 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -839,9 +839,12 @@ int irq_domain_xlate_onetwocell(struct irq_domain *d,
 {
 	if (WARN_ON(intsize < 1))
 		return -EINVAL;
-	*out_hwirq = intspec[0];
-	*out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
-	return 0;
+	if (intsize == 1)
+		return irq_domain_xlate_onecell(d, ctrlr, intspec, intsize,
+						out_hwirq, out_type);
+	else
+		return irq_domain_xlate_twocell(d, ctrlr, intspec, intsize,
+						out_hwirq, out_type);
 }
 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
 
-- 
1.7.11.2