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Diffstat (limited to 'kernel/irq/devres.c')
-rw-r--r--kernel/irq/devres.c65
1 files changed, 63 insertions, 2 deletions
diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
index 74d90a754268..1613bfd48365 100644
--- a/kernel/irq/devres.c
+++ b/kernel/irq/devres.c
@@ -2,6 +2,7 @@
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/gfp.h>
+#include <linux/irq.h>
/*
* Device resource management aware IRQ request/free implementation.
@@ -33,7 +34,7 @@ static int devm_irq_match(struct device *dev, void *res, void *data)
* @thread_fn: function to be called in a threaded interrupt context. NULL
* for devices which handle everything in @handler
* @irqflags: Interrupt type flags
- * @devname: An ascii name for the claiming device
+ * @devname: An ascii name for the claiming device, dev_name(dev) if NULL
* @dev_id: A cookie passed back to the handler function
*
* Except for the extra @dev argument, this function takes the
@@ -57,6 +58,9 @@ int devm_request_threaded_irq(struct device *dev, unsigned int irq,
if (!dr)
return -ENOMEM;
+ if (!devname)
+ devname = dev_name(dev);
+
rc = request_threaded_irq(irq, handler, thread_fn, irqflags, devname,
dev_id);
if (rc) {
@@ -80,7 +84,7 @@ EXPORT_SYMBOL(devm_request_threaded_irq);
* @thread_fn: function to be called in a threaded interrupt context. NULL
* for devices which handle everything in @handler
* @irqflags: Interrupt type flags
- * @devname: An ascii name for the claiming device
+ * @devname: An ascii name for the claiming device, dev_name(dev) if NULL
* @dev_id: A cookie passed back to the handler function
*
* Except for the extra @dev argument, this function takes the
@@ -103,6 +107,9 @@ int devm_request_any_context_irq(struct device *dev, unsigned int irq,
if (!dr)
return -ENOMEM;
+ if (!devname)
+ devname = dev_name(dev);
+
rc = request_any_context_irq(irq, handler, irqflags, devname, dev_id);
if (rc < 0) {
devres_free(dr);
@@ -137,3 +144,57 @@ void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
free_irq(irq, dev_id);
}
EXPORT_SYMBOL(devm_free_irq);
+
+struct irq_desc_devres {
+ unsigned int from;
+ unsigned int cnt;
+};
+
+static void devm_irq_desc_release(struct device *dev, void *res)
+{
+ struct irq_desc_devres *this = res;
+
+ irq_free_descs(this->from, this->cnt);
+}
+
+/**
+ * __devm_irq_alloc_descs - Allocate and initialize a range of irq descriptors
+ * for a managed device
+ * @dev: Device to allocate the descriptors for
+ * @irq: Allocate for specific irq number if irq >= 0
+ * @from: Start the search from this irq number
+ * @cnt: Number of consecutive irqs to allocate
+ * @node: Preferred node on which the irq descriptor should be allocated
+ * @owner: Owning module (can be NULL)
+ * @affinity: Optional pointer to an affinity mask array of size @cnt
+ * which hints where the irq descriptors should be allocated
+ * and which default affinities to use
+ *
+ * Returns the first irq number or error code.
+ *
+ * Note: Use the provided wrappers (devm_irq_alloc_desc*) for simplicity.
+ */
+int __devm_irq_alloc_descs(struct device *dev, int irq, unsigned int from,
+ unsigned int cnt, int node, struct module *owner,
+ const struct cpumask *affinity)
+{
+ struct irq_desc_devres *dr;
+ int base;
+
+ dr = devres_alloc(devm_irq_desc_release, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+
+ base = __irq_alloc_descs(irq, from, cnt, node, owner, affinity);
+ if (base < 0) {
+ devres_free(dr);
+ return base;
+ }
+
+ dr->from = base;
+ dr->cnt = cnt;
+ devres_add(dev, dr);
+
+ return base;
+}
+EXPORT_SYMBOL_GPL(__devm_irq_alloc_descs);