linux-kernel - [PATCH v2 09/10] genirq/irqdomain: fall back to default domain when creating hierarchy domain

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Date:   Tue, 19 Feb 2019 16:57:23 +0100
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 09/10] genirq/irqdomain: fall back to default domain when creating hierarchy domain

When creating hierarchy domains use irq_default_domain as parent, if no
parent was given by the caller. This avoids adding helper code for
querying the underlying platform irq domain.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
---
 kernel/irq/irqdomain.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 8b0be4bd6565..617c482d0778 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1021,7 +1021,10 @@ struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
 	else
 		domain = irq_domain_create_tree(fwnode, ops, host_data);
 	if (domain) {
-		domain->parent = parent;
+		if (parent)
+			domain->parent = parent;
+		else
+			domain->parent = irq_default_domain;
 		domain->flags |= flags;
 	}
 
-- 
2.13.7