This is a version of irq_create_mapping() that propagates the precise
error code instead of returning 0 for all errors. It will be used in
subsequent patches to allow further propagation of error codes.
To avoid code duplication, implement irq_create_mapping() as a wrapper
around the new __irq_create_mapping().
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
kernel/irq/irqdomain.c | 59 +++++++++++++++++++++++++++++++++-----------------
1 file changed, 39 insertions(+), 20 deletions(-)
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 706724e..d2a3b01 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -374,30 +374,21 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain)
}
EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
-/**
- * irq_create_mapping() - Map a hardware interrupt into linux irq space
- * @domain: domain owning this hardware interrupt or NULL for default domain
- * @hwirq: hardware irq number in that domain space
- *
- * Only one mapping per hardware interrupt is permitted. Returns a linux
- * irq number.
- * If the sense/trigger is to be specified, set_irq_type() should be called
- * on the number returned from that call.
- */
-unsigned int irq_create_mapping(struct irq_domain *domain,
- irq_hw_number_t hwirq)
+static int __irq_create_mapping(struct irq_domain *domain,
+ irq_hw_number_t hwirq, unsigned int *virqp)
{
- unsigned int hint;
- int virq;
+ unsigned int hint, virq;
+ int ret;
- pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
+ pr_debug("__irq_create_mapping(0x%p, 0x%lx, %p)\n", domain, hwirq,
+ virqp);
/* Look for default domain if nececssary */
if (domain == NULL)
domain = irq_default_domain;
if (domain == NULL) {
WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
- return 0;
+ return -ENODEV;
}
pr_debug("-> using domain @%p\n", domain);
@@ -405,7 +396,11 @@ unsigned int irq_create_mapping(struct irq_domain *domain,
virq = irq_find_mapping(domain, hwirq);
if (virq) {
pr_debug("-> existing mapping on virq %d\n", virq);
- return virq;
+
+ if (virqp)
+ *virqp = virq;
+
+ return 0;
}
/* Allocate a virtual interrupt number */
@@ -417,17 +412,41 @@ unsigned int irq_create_mapping(struct irq_domain *domain,
virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
if (virq <= 0) {
pr_debug("-> virq allocation failed\n");
- return 0;
+ return virq ? : -ENOSPC;
}
- if (irq_domain_associate(domain, virq, hwirq)) {
+ ret = irq_domain_associate(domain, virq, hwirq);
+ if (ret) {
irq_free_desc(virq);
- return 0;
+ return ret;
}
pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
hwirq, of_node_full_name(domain->of_node), virq);
+ if (virqp)
+ *virqp = virq;
+
+ return 0;
+}
+/**
+ * irq_create_mapping() - Map a hardware interrupt into linux irq space
+ * @domain: domain owning this hardware interrupt or NULL for default domain
+ * @hwirq: hardware irq number in that domain space
+ *
+ * Only one mapping per hardware interrupt is permitted. Returns a linux
+ * irq number.
+ * If the sense/trigger is to be specified, set_irq_type() should be called
+ * on the number returned from that call.
+ */
+unsigned int irq_create_mapping(struct irq_domain *domain,
+ irq_hw_number_t hwirq)
+{
+ unsigned int virq;
+
+ if (__irq_create_mapping(domain, hwirq, &virq))
+ return 0;
+
return virq;
}
EXPORT_SYMBOL_GPL(irq_create_mapping);
--
1.8.4
--
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