linux-kernel - [irqchip: irq/irqchip-next] sh: intc: Drop the use of irq_create_identity

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Date:   Wed, 07 Apr 2021 12:38:15 -0000
From:   "irqchip-bot for Marc Zyngier" <tip-bot2@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Marc Zyngier <maz@...nel.org>, tglx@...utronix.de
Subject: [irqchip: irq/irqchip-next] sh: intc: Drop the use of
 irq_create_identity_mapping()

The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     eef56c3a0492e4c1bc2a081da8f402a26d882489
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/eef56c3a0492e4c1bc2a081da8f402a26d882489
Author:        Marc Zyngier <maz@...nel.org>
AuthorDate:    Fri, 02 Apr 2021 15:58:21 +01:00
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Wed, 07 Apr 2021 12:12:52 +01:00

sh: intc: Drop the use of irq_create_identity_mapping()

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.

Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 drivers/sh/intc/core.c | 49 +++++++++++++++--------------------------
 1 file changed, 19 insertions(+), 30 deletions(-)

diff --git a/drivers/sh/intc/core.c b/drivers/sh/intc/core.c
index a14684f..ca4f4ca 100644
--- a/drivers/sh/intc/core.c
+++ b/drivers/sh/intc/core.c
@@ -179,6 +179,21 @@ static unsigned int __init save_reg(struct intc_desc_int *d,
 	return 0;
 }
 
+static bool __init intc_map(struct irq_domain *domain, int irq)
+{
+	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;
@@ -311,24 +326,12 @@ int __init register_intc_controller(struct intc_desc *desc)
 	for (i = 0; i < hw->nr_vectors; i++) {
 		struct intc_vect *vect = hw->vectors + i;
 		unsigned int irq = evt2irq(vect->vect);
-		int res;
 
 		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 +348,8 @@ 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;