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Message-ID: <51EE3264.7010801@asianux.com>
Date: Tue, 23 Jul 2013 15:36:04 +0800
From: Chen Gang <gang.chen@...anux.com>
To: Thomas Gleixner <tglx@...utronix.de>,
Greg KH <gregkh@...uxfoundation.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] kernel/irq/devres.c: move "kernel/irq/devres.c" to "drivers/base/devres_irq.c"
"kernel/irq/devres.c" is a driver extension tool for irq (with devres)
which is independent on 'GENERIC_HARDIRQS', so it is not suitable to
still be in "kernel/irq/" which depends on 'GENERIC_HARDIRQS'.
It is a basic tool for drivers, so can move it to "drivers/base/" to be
independent on 'GENERIC_HARDIRQS'.
It is about irq features, so if can not find other more suitable place,
can still let their declaration in "include/linux/interrupts.h".
The related error (with randconfig which disable 'GENERIC_HARDIRQS')
drivers/built-in.o: In function `dw_dma_probe':
(.text+0x3747a): undefined reference to `devm_request_threaded_irq'
Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
drivers/base/Makefile | 2 +-
drivers/base/devres_irq.c | 94 +++++++++++++++++++++++++++++++++++++++++++++
kernel/irq/Makefile | 2 +-
kernel/irq/devres.c | 94 ---------------------------------------------
4 files changed, 96 insertions(+), 96 deletions(-)
create mode 100644 drivers/base/devres_irq.c
delete mode 100644 kernel/irq/devres.c
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index 94e8a80..cb706f9 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -2,7 +2,7 @@
obj-y := core.o bus.o dd.o syscore.o \
driver.o class.o platform.o \
- cpu.o firmware.o init.o map.o devres.o \
+ cpu.o firmware.o init.o map.o devres.o devres_irq.o \
attribute_container.o transport_class.o \
topology.o
obj-$(CONFIG_DEVTMPFS) += devtmpfs.o
diff --git a/drivers/base/devres_irq.c b/drivers/base/devres_irq.c
new file mode 100644
index 0000000..bd8e788
--- /dev/null
+++ b/drivers/base/devres_irq.c
@@ -0,0 +1,94 @@
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/gfp.h>
+
+/*
+ * 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_threaded_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
+ * @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
+ * @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, devm_free_irq() must be used.
+ */
+int devm_request_threaded_irq(struct device *dev, unsigned int irq,
+ irq_handler_t handler, irq_handler_t thread_fn,
+ 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_threaded_irq(irq, handler, thread_fn, irqflags, devname,
+ dev_id);
+ if (rc) {
+ devres_free(dr);
+ return rc;
+ }
+
+ dr->irq = irq;
+ dr->dev_id = dev_id;
+ devres_add(dev, dr);
+
+ return 0;
+}
+EXPORT_SYMBOL(devm_request_threaded_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 devm_request_irq().
+ */
+void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
+{
+ struct irq_devres match_data = { irq, dev_id };
+
+ WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
+ &match_data));
+ free_irq(irq, dev_id);
+}
+EXPORT_SYMBOL(devm_free_irq);
diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile
index fff1738..d98eec9 100644
--- a/kernel/irq/Makefile
+++ b/kernel/irq/Makefile
@@ -1,5 +1,5 @@
-obj-y := irqdesc.o handle.o manage.o spurious.o resend.o chip.o dummychip.o devres.o
+obj-y := irqdesc.o handle.o manage.o spurious.o resend.o chip.o dummychip.o
obj-$(CONFIG_GENERIC_IRQ_CHIP) += generic-chip.o
obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
obj-$(CONFIG_IRQ_DOMAIN) += irqdomain.o
diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
deleted file mode 100644
index bd8e788..0000000
--- a/kernel/irq/devres.c
+++ /dev/null
@@ -1,94 +0,0 @@
-#include <linux/module.h>
-#include <linux/interrupt.h>
-#include <linux/device.h>
-#include <linux/gfp.h>
-
-/*
- * 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_threaded_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
- * @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
- * @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, devm_free_irq() must be used.
- */
-int devm_request_threaded_irq(struct device *dev, unsigned int irq,
- irq_handler_t handler, irq_handler_t thread_fn,
- 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_threaded_irq(irq, handler, thread_fn, irqflags, devname,
- dev_id);
- if (rc) {
- devres_free(dr);
- return rc;
- }
-
- dr->irq = irq;
- dr->dev_id = dev_id;
- devres_add(dev, dr);
-
- return 0;
-}
-EXPORT_SYMBOL(devm_request_threaded_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 devm_request_irq().
- */
-void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id)
-{
- struct irq_devres match_data = { irq, dev_id };
-
- WARN_ON(devres_destroy(dev, devm_irq_release, devm_irq_match,
- &match_data));
- free_irq(irq, dev_id);
-}
-EXPORT_SYMBOL(devm_free_irq);
--
1.7.7.6
--
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