Subject: [PATCH 4/9] sh: intc: Drop the use of irq_create_identity_mapping()

From: Marc Zyngier <[email-masked]>
Date: Tue, 6 Apr 2021 10:35:52 +0100

Instead of playing games with using irq_create_identity_mapping()
and irq_domain_associate(), drop the use of the former and only
use the latter, together with the allocation of the irq_desc
as needed.

It doesn't make the code less awful, but at least the intent
is clearer.

Signed-off-by: Marc Zyngier <[email-masked]>
---
 drivers/sh/intc/core.c | 50 ++++++++++++++++++------------------------
 1 file changed, 21 insertions(+), 29 deletions(-)

diff --git a/drivers/sh/intc/core.c b/drivers/sh/intc/core.c
index a14684ffe4c1..6c57ee1ce6c4 100644
--- a/drivers/sh/intc/core.c
+++ b/drivers/sh/intc/core.c
@@ -179,6 +179,23 @@ static unsigned int __init save_reg(struct intc_desc_int *d,
 	return 0;
 }
 
+static bool __init intc_map(struct irq_domain *domain, int irq)
+{
+	int res;
+
+	if (!irq_to_desc(irq) && irq_alloc_desc_at(irq, NUMA_NO_NODE) != irq) {
+		pr_err("uname to allocate IRQ %d\n", irq);
+		return false;
+	}
+
+	if (irq_domain_associate(domain, irq, irq)) {
+		pr_err("domain association failure\n");
+		return false;
+	}
+
+	return true;
+}
+
 int __init register_intc_controller(struct intc_desc *desc)
 {
 	unsigned int i, k, smp;
@@ -316,19 +333,8 @@ int __init register_intc_controller(struct intc_desc *desc)
 		if (!vect->enum_id)
 			continue;
 
-		res = irq_create_identity_mapping(d->domain, irq);
-		if (unlikely(res)) {
-			if (res == -EEXIST) {
-				res = irq_domain_associate(d->domain, irq, irq);
-				if (unlikely(res)) {
-					pr_err("domain association failure\n");
-					continue;
-				}
-			} else {
-				pr_err("can't identity map IRQ %d\n", irq);
-				continue;
-			}
-		}
+		if (!intc_map(d->domain, irq))
+			continue;
 
 		intc_irq_xlate_set(irq, vect->enum_id, d);
 		intc_register_irq(desc, d, vect->enum_id, irq);
@@ -345,22 +351,8 @@ int __init register_intc_controller(struct intc_desc *desc)
 			 * IRQ support, each vector still needs to have
 			 * its own backing irq_desc.
 			 */
-			res = irq_create_identity_mapping(d->domain, irq2);
-			if (unlikely(res)) {
-				if (res == -EEXIST) {
-					res = irq_domain_associate(d->domain,
-								   irq2, irq2);
-					if (unlikely(res)) {
-						pr_err("domain association "
-						       "failure\n");
-						continue;
-					}
-				} else {
-					pr_err("can't identity map IRQ %d\n",
-					       irq);
-					continue;
-				}
-			}
+			if (!intc_map(d->domain, irq2))
+				continue;
 
 			vect2->enum_id = 0;
 
-- 
2.29.2