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Subject[PATCH 3/13] devres: implement managed IRQ interface
Date
From
Implement managed IRQ interface - devm_request_irq() and
devm_free_irq(). Except for the first @dev argument and being
managed, these take the same arguments and have the same effect as
non-managed coutnerparts.

Signed-off-by: Tejun Heo <htejun@gmail.com>
---
include/linux/interrupt.h | 6 +++
kernel/irq/manage.c | 86 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 92 insertions(+), 0 deletions(-)
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index e36e86c..5a8ba0b 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -12,6 +12,7 @@
#include <linux/sched.h>
#include <linux/irqflags.h>
#include <linux/bottom_half.h>
+#include <linux/device.h>
#include <asm/atomic.h>
#include <asm/ptrace.h>
#include <asm/system.h>
@@ -83,6 +84,11 @@ extern int request_irq(unsigned int, irq_handler_t handler,
unsigned long, const char *, void *);
extern void free_irq(unsigned int, void *);

+extern int devm_request_irq(struct device *dev, unsigned int irq,
+ irq_handler_t handler, unsigned long irqflags,
+ const char *devname, void *dev_id);
+extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
+
/*
* On lockdep we dont want to enable hardirqs in hardirq
* context. Use local_irq_enable_in_hardirq() to annotate
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index b385878..9aa6544 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -479,3 +479,89 @@ int request_irq(unsigned int irq, irq_handler_t handler,
return retval;
}
EXPORT_SYMBOL(request_irq);
+
+/*
+ * Device resource management aware IRQ request/free implementation.
+ */
+struct irq_devres {
+ unsigned int irq;
+ void *dev_id;
+};
+
+static void devm_irq_release(struct device *dev, void *res)
+{
+ struct irq_devres *this = res;
+
+ free_irq(this->irq, this->dev_id);
+}
+
+static int devm_irq_match(struct device *dev, void *res, void *data)
+{
+ struct irq_devres *this = res, *match = data;
+
+ return this->irq == match->irq && this->dev_id == match->dev_id;
+}
+
+/**
+ * devm_request_irq - allocate an interrupt line for a managed device
+ * @dev: device to request interrupt for
+ * @irq: Interrupt line to allocate
+ * @handler: Function to be called when the IRQ occurs
+ * @irqflags: Interrupt type flags
+ * @devname: An ascii name for the claiming device
+ * @dev_id: A cookie passed back to the handler function
+ *
+ * Except for the extra @dev argument, this function takes the
+ * same arguments and performs the same function as
+ * request_irq(). IRQs requested with this function will be
+ * automatically freed on driver detach.
+ *
+ * If an IRQ allocated with this function needs to be freed
+ * separately, dev_free_irq() must be used.
+ */
+int devm_request_irq(struct device *dev, unsigned int irq,
+ irq_handler_t handler, unsigned long irqflags,
+ const char *devname, void *dev_id)
+{
+ struct irq_devres *dr;
+ int rc;
+
+ dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
+ GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+
+ rc = request_irq(irq, handler, irqflags, devname, dev_id);
+ if (rc) {
+ kfree(dr);
+ return rc;
+ }
+
+ dr->irq = irq;
+ dr->dev_id = dev_id;
+ devres_add(dev, dr);
+
+ return 0;
+}
+EXPORT_SYMBOL(devm_request_irq);
+
+/**
+ * devm_free_irq - free an interrupt
+ * @dev: device to free interrupt for
+ * @irq: Interrupt line to free
+ * @dev_id: Device identity to free
+ *
+ * Except for the extra @dev argument, this function takes the
+ * same arguments and performs the same function as free_irq().
+ * This function instead of free_irq() should be used to manually
+ * free IRQs allocated with dev_request_irq().
+ */
+void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
+{
+ struct irq_devres match_data = { irq, dev_id };
+
+ free_irq(irq, dev_id);
+ WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
+ &match_data));
+}
+EXPORT_SYMBOL(devm_free_irq);
--
1.4.4.3

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