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authorPaul Mundt <lethal@linux-sh.org>2012-05-19 15:11:41 +0900
committerGrant Likely <grant.likely@secretlab.ca>2012-05-19 12:32:35 -0600
commit58ee99ada293b5ed971a023304fcfbc1a0ccdb1c (patch)
tree29faab64364615dda0cb373ee7dbd483ff89ce9c /kernel/irq
parent36be50515fe2aef61533b516fa2576a2c7fe7664 (diff)
downloadlinux-58ee99ada293b5ed971a023304fcfbc1a0ccdb1c.tar.bz2
irqdomain: Support removal of IRQ domains.
Now that IRQ domains are being used by modules it's necessary to support removing them, too. This adds a new irq_domain_remove() routine for doing the bulk of the heavy lifting. It's left as an exercise to the caller to ensure all mappings have been appropriatey disposed of before attempting to remove the domain. Signed-off-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/irqdomain.c61
1 files changed, 59 insertions, 2 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 0e0ba5f840b2..9cae0b2f509f 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -56,6 +56,12 @@ static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
return domain;
}
+static void irq_domain_free(struct irq_domain *domain)
+{
+ of_node_put(domain->of_node);
+ kfree(domain);
+}
+
static void irq_domain_add(struct irq_domain *domain)
{
mutex_lock(&irq_domain_mutex);
@@ -65,6 +71,58 @@ static void irq_domain_add(struct irq_domain *domain)
domain->revmap_type, domain);
}
+/**
+ * irq_domain_remove() - Remove an irq domain.
+ * @domain: domain to remove
+ *
+ * This routine is used to remove an irq domain. The caller must ensure
+ * that all mappings within the domain have been disposed of prior to
+ * use, depending on the revmap type.
+ */
+void irq_domain_remove(struct irq_domain *domain)
+{
+ mutex_lock(&irq_domain_mutex);
+
+ switch (domain->revmap_type) {
+ case IRQ_DOMAIN_MAP_LEGACY:
+ /*
+ * Legacy domains don't manage their own irq_desc
+ * allocations, we expect the caller to handle irq_desc
+ * freeing on their own.
+ */
+ break;
+ case IRQ_DOMAIN_MAP_TREE:
+ /*
+ * radix_tree_delete() takes care of destroying the root
+ * node when all entries are removed. Shout if there are
+ * any mappings left.
+ */
+ WARN_ON(domain->revmap_data.tree.height);
+ break;
+ case IRQ_DOMAIN_MAP_LINEAR:
+ kfree(domain->revmap_data.linear.revmap);
+ domain->revmap_data.linear.size = 0;
+ break;
+ case IRQ_DOMAIN_MAP_NOMAP:
+ break;
+ }
+
+ list_del(&domain->link);
+
+ /*
+ * If the going away domain is the default one, reset it.
+ */
+ if (unlikely(irq_default_domain == domain))
+ irq_set_default_host(NULL);
+
+ mutex_unlock(&irq_domain_mutex);
+
+ pr_debug("irq: Removed domain of type %d @0x%p\n",
+ domain->revmap_type, domain);
+
+ irq_domain_free(domain);
+}
+
static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
@@ -117,8 +175,7 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
if (WARN_ON(!irq_data || irq_data->domain)) {
mutex_unlock(&irq_domain_mutex);
- of_node_put(domain->of_node);
- kfree(domain);
+ irq_domain_free(domain);
return NULL;
}
}