linux-kernel - [PATCH 07/12] irqdomain: Make ops->map hook optional

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Date:	Fri, 15 Jun 2012 23:01:32 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	linux-kernel@...r.kernel.org
Cc:	Milton Miller <miltonm@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Paul Mundt <lethal@...ux-sh.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <rob.herring@...xeda.com>
Subject: [PATCH 07/12] irqdomain: Make ops->map hook optional

There isn't a really compelling reason to force ->map to be populated,
so allow it to be left unset.

Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
Cc: Paul Mundt <lethal@...ux-sh.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Rob Herring <rob.herring@...xeda.com>
---
 kernel/irq/irqdomain.c |   14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 00c383b..e88a7b0 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -205,7 +205,8 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 		 * one can then use irq_create_mapping() to
 		 * explicitly change them
 		 */
-		ops->map(domain, irq, hwirq);
+		if (ops->map)
+			ops->map(domain, irq, hwirq);
 
 		/* Clear norequest flags */
 		irq_clear_status_flags(irq, IRQ_NOREQUEST);
@@ -402,8 +403,8 @@ int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
 
 		irq_data->hwirq = hwirq;
 		irq_data->domain = domain;
-		if (domain->ops->map(domain, virq, hwirq)) {
-			pr_debug("irq-%i==>hwirq-0x%lx mapping failed\n", virq, hwirq);
+		if (domain->ops->map && domain->ops->map(domain, virq, hwirq)) {
+			pr_err("irq-%i==>hwirq-0x%lx mapping failed\n", virq, hwirq);
 			irq_data->domain = NULL;
 			irq_data->hwirq = 0;
 			goto err_unmap;
@@ -783,12 +784,6 @@ static int __init irq_debugfs_init(void)
 __initcall(irq_debugfs_init);
 #endif /* CONFIG_IRQ_DOMAIN_DEBUG */
 
-static int irq_domain_simple_map(struct irq_domain *d, unsigned int irq,
-				 irq_hw_number_t hwirq)
-{
-	return 0;
-}
-
 /**
  * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
  *
@@ -851,7 +846,6 @@ int irq_domain_xlate_onetwocell(struct irq_domain *d,
 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
 
 const struct irq_domain_ops irq_domain_simple_ops = {
-	.map = irq_domain_simple_map,
 	.xlate = irq_domain_xlate_onetwocell,
 };
 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
-- 
1.7.9.5

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