[PATCH] sort the devres mess out

* Split the implementation-agnostic stuff in separate files.
* Make sure that targets using non-default request_irq() pull
  kernel/irq/devres.o
* Introduce new symbols (HAS_IOPORT and HAS_IOMEM) defaulting to positive;
  allow architectures to turn them off (we needed these symbols anyway for
  dependencies of quite a few drivers).
* protect the ioport-related parts of lib/devres.o with CONFIG_HAS_IOPORT.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 89 insertions, 87 deletions

diff --git a/kernel/irq/Makefile b/kernel/irq/Makefile
index 1dab0ac3f797..681c52dbfe22 100644
--- a/kernel/irq/Makefile
+++ b/kernel/irq/Makefile
@@ -1,5 +1,5 @@
 
-obj-y := handle.o manage.o spurious.o resend.o chip.o
+obj-y := handle.o manage.o spurious.o resend.o chip.o devres.o
 obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o
diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
new file mode 100644
index 000000000000..85a430da0fb6
--- /dev/null
+++ b/kernel/irq/devres.c
@@ -0,0 +1,88 @@
+#include <linux/module.h>
+#include <linux/interrupt.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_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);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index c4b7ed1cebf7..8b961adc3bd2 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -482,89 +482,3 @@ 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);