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Subject[PATCH 01/12] irqdomain: Split disassociating code into separate function
Date
This patch moves the irq disassociation code out into a separate
function in preparation to extend irq_setup_virq to handle multiple
irqs and rename it for use by interrupt controller drivers. The new
function will be used by irq_setup_virq() in its error path.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rob Herring <rob.herring@calxeda.com>
---
kernel/irq/irqdomain.c | 75 ++++++++++++++++++++++++++++++------------------
1 file changed, 47 insertions(+), 28 deletions(-)
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index b1f774c..4161d2a 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -333,6 +333,52 @@ void irq_set_default_host(struct irq_domain *domain)
}
EXPORT_SYMBOL_GPL(irq_set_default_host);

+static void irq_domain_disassociate_many(struct irq_domain *domain,
+ unsigned int irq_base, int count)
+{
+ /*
+ * disassociate in reverse order;
+ * not strictly necessary, but nice for unwinding
+ */
+ while (count--) {
+ int irq = irq_base + count;
+ struct irq_data *irq_data = irq_get_irq_data(irq);
+ irq_hw_number_t hwirq = irq_data->hwirq;
+
+ if (WARN_ON(!irq_data || irq_data->domain != domain))
+ continue;
+
+ irq_set_status_flags(irq, IRQ_NOREQUEST);
+
+ /* remove chip and handler */
+ irq_set_chip_and_handler(irq, NULL, NULL);
+
+ /* Make sure it's completed */
+ synchronize_irq(irq);
+
+ /* Tell the PIC about it */
+ if (domain->ops->unmap)
+ domain->ops->unmap(domain, irq);
+ smp_mb();
+
+ irq_data->domain = NULL;
+ irq_data->hwirq = 0;
+
+ /* Clear reverse map */
+ switch(domain->revmap_type) {
+ case IRQ_DOMAIN_MAP_LINEAR:
+ if (hwirq < domain->revmap_data.linear.size)
+ domain->revmap_data.linear.revmap[hwirq] = 0;
+ break;
+ case IRQ_DOMAIN_MAP_TREE:
+ mutex_lock(&revmap_trees_mutex);
+ radix_tree_delete(&domain->revmap_data.tree, hwirq);
+ mutex_unlock(&revmap_trees_mutex);
+ break;
+ }
+ }
+}
+
static int irq_setup_virq(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq)
{
@@ -513,7 +559,6 @@ void irq_dispose_mapping(unsigned int virq)
{
struct irq_data *irq_data = irq_get_irq_data(virq);
struct irq_domain *domain;
- irq_hw_number_t hwirq;

if (!virq || !irq_data)
return;
@@ -526,33 +571,7 @@ void irq_dispose_mapping(unsigned int virq)
if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
return;

- irq_set_status_flags(virq, IRQ_NOREQUEST);
-
- /* remove chip and handler */
- irq_set_chip_and_handler(virq, NULL, NULL);
-
- /* Make sure it's completed */
- synchronize_irq(virq);
-
- /* Tell the PIC about it */
- if (domain->ops->unmap)
- domain->ops->unmap(domain, virq);
- smp_mb();
-
- /* Clear reverse map */
- hwirq = irq_data->hwirq;
- switch(domain->revmap_type) {
- case IRQ_DOMAIN_MAP_LINEAR:
- if (hwirq < domain->revmap_data.linear.size)
- domain->revmap_data.linear.revmap[hwirq] = 0;
- break;
- case IRQ_DOMAIN_MAP_TREE:
- mutex_lock(&revmap_trees_mutex);
- radix_tree_delete(&domain->revmap_data.tree, hwirq);
- mutex_unlock(&revmap_trees_mutex);
- break;
- }
-
+ irq_domain_disassociate_many(domain, virq, 1);
irq_free_desc(virq);
}
EXPORT_SYMBOL_GPL(irq_dispose_mapping);
--
1.7.9.5


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