[PATCH kernel v4 6/8] genirq/irqdomain: Move hierarchical IRQ cleanup to kobject_release

[Alexey Kardashevskiy]

This moves hierarchical domain's irqs cleanup into the kobject release
hook to make irq_domain_free_irqs() as simple as kobject_put.

Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru>
---
 kernel/irq/irqdomain.c | 43 +++++++++++++++++++++---------------------
 1 file changed, 22 insertions(+), 21 deletions(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 4779d912bb86..a0a81cc6c524 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -863,21 +863,9 @@ EXPORT_SYMBOL_GPL(irq_create_of_mapping);
  */
 void irq_dispose_mapping(unsigned int virq)
 {
-       struct irq_data *irq_data = irq_get_irq_data(virq);
-       struct irq_domain *domain;
+       struct irq_desc *desc = irq_to_desc(virq);
 
-       if (!virq || !irq_data)
-               return;
-
-       domain = irq_data->domain;
-       if (WARN_ON(domain == NULL))
-               return;
-
-       if (irq_domain_is_hierarchy(domain)) {
-               irq_domain_free_irqs(virq, 1);
-       } else {
-               irq_free_desc(virq);
-       }
+       kobject_put(&desc->kobj);
 }
 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
 
@@ -1396,6 +1384,19 @@ int irq_domain_alloc_irqs_hierarchy(struct irq_domain 
*domain,
        return domain->ops->alloc(domain, irq_base, nr_irqs, arg);
 }
 
+static void irq_domain_hierarchy_free_desc(struct irq_desc *desc)
+{
+       unsigned int virq = desc->irq_data.irq;
+       struct irq_data *data = irq_get_irq_data(virq);
+
+       mutex_lock(&irq_domain_mutex);
+       irq_domain_remove_irq(virq);
+       irq_domain_free_irqs_hierarchy(data->domain, virq, 1);
+       mutex_unlock(&irq_domain_mutex);
+
+       irq_domain_free_irq_data(virq, 1);
+}
+
 int __irq_domain_alloc_irqs_data(struct irq_domain *domain, int virq,
                                 unsigned int nr_irqs, int node, void *arg,
                                 const struct irq_affinity_desc *affinity)
@@ -1430,7 +1431,10 @@ int __irq_domain_alloc_irqs_data(struct irq_domain 
*domain, int virq,
        }
 
        for (i = 0; i < nr_irqs; i++) {
+               struct irq_desc *desc = irq_to_desc(virq + i);
+
                irq_domain_insert_irq(virq + i);
+               desc->free_irq = irq_domain_hierarchy_free_desc;
        }
        mutex_unlock(&irq_domain_mutex);
 
@@ -1675,14 +1679,11 @@ void irq_domain_free_irqs(unsigned int virq, unsigned 
int nr_irqs)
                 "NULL pointer, cannot free irq\n"))
                return;
 
-       mutex_lock(&irq_domain_mutex);
-       for (i = 0; i < nr_irqs; i++)
-               irq_domain_remove_irq(virq + i);
-       irq_domain_free_irqs_hierarchy(data->domain, virq, nr_irqs);
-       mutex_unlock(&irq_domain_mutex);
+       for (i = 0; i < nr_irqs; i++) {
+               struct irq_desc *desc = irq_to_desc(virq + i);
 
-       irq_domain_free_irq_data(virq, nr_irqs);
-       irq_free_descs(virq, nr_irqs);
+               kobject_put(&desc->kobj);
+       }
 }
 
 /**
-- 
2.17.1