[PATCH] Create vio_bus_ops

Create vio_bus_ops so that we just pass a structure to vio_bus_init
instead of three separate function pointers.

Rearrange vio.h to avoid forward references. vio.h only needs
struct device_node from prom.h so remove the include and just
declare it.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/ppc64/kernel/iSeries_vio.c

@@ -131,14 +131,18 @@ static int vio_match_device_iseries(const struct vio_device_id *id,
 	return strncmp(dev->type, id->type, strlen(id->type)) == 0;
 }
 
+static struct vio_bus_ops vio_bus_ops_iseries = {
+	.match = vio_match_device_iseries,
+};
+
 /**
  * vio_bus_init_iseries: - Initialize the iSeries virtual IO bus
  */
 static int __init vio_bus_init_iseries(void)
 {
 	int err;
 
-	err = vio_bus_init(vio_match_device_iseries, NULL, NULL);
+	err = vio_bus_init(&vio_bus_ops_iseries);
 	if (err == 0) {
 		iommu_vio_init();
 		vio_bus_device.iommu_table = &vio_iommu_table;

arch/ppc64/kernel/pSeries_vio.c

@@ -76,16 +76,20 @@ static void vio_unregister_device_pseries(struct vio_dev *viodev)
 	device_remove_file(&viodev->dev, &dev_attr_devspec);
 }
 
+static struct vio_bus_ops vio_bus_ops_pseries = {
+	.match = vio_match_device_pseries,
+	.unregister_device = vio_unregister_device_pseries,
+	.release_device = vio_release_device_pseries,
+};
+
 /**
  * vio_bus_init_pseries: - Initialize the pSeries virtual IO bus
  */
 static int __init vio_bus_init_pseries(void)
 {
 	int err;
 
-	err = vio_bus_init(vio_match_device_pseries,
-			vio_unregister_device_pseries,
-			vio_release_device_pseries);
+	err = vio_bus_init(&vio_bus_ops_pseries);
 	if (err == 0)
 		probe_bus_pseries();
 	return err;

arch/ppc64/kernel/vio.c

@@ -32,10 +32,7 @@ struct vio_dev vio_bus_device  = { /* fake "parent" device */
 	.dev.bus = &vio_bus_type,
 };
 
-static int (*is_match)(const struct vio_device_id *id,
-		const struct vio_dev *dev);
-static void (*unregister_device_callback)(struct vio_dev *dev);
-static void (*release_device_callback)(struct device *dev);
+static struct vio_bus_ops vio_bus_ops;
 
 /*
  * Convert from struct device to struct vio_dev and pass to driver.
@@ -115,7 +112,7 @@ static const struct vio_device_id *vio_match_device(
 		const struct vio_device_id *ids, const struct vio_dev *dev)
 {
 	while (ids->type) {
-		if (is_match(ids, dev))
+		if (vio_bus_ops.match(ids, dev))
 			return ids;
 		ids++;
 	}
@@ -125,16 +122,11 @@ static const struct vio_device_id *vio_match_device(
 /**
  * vio_bus_init: - Initialize the virtual IO bus
  */
-int __init vio_bus_init(int (*match_func)(const struct vio_device_id *id,
-			const struct vio_dev *dev),
-		void (*unregister_dev)(struct vio_dev *),
-		void (*release_dev)(struct device *))
+int __init vio_bus_init(struct vio_bus_ops *ops)
 {
 	int err;
 
-	is_match = match_func;
-	unregister_device_callback = unregister_dev;
-	release_device_callback = release_dev;
+	vio_bus_ops = *ops;
 
 	err = bus_register(&vio_bus_type);
 	if (err) {
@@ -159,8 +151,8 @@ int __init vio_bus_init(int (*match_func)(const struct vio_device_id *id,
 /* vio_dev refcount hit 0 */
 static void __devinit vio_dev_release(struct device *dev)
 {
-	if (release_device_callback)
-		release_device_callback(dev);
+	if (vio_bus_ops.release_device)
+		vio_bus_ops.release_device(dev);
 	kfree(to_vio_dev(dev));
 }
 
@@ -191,8 +183,8 @@ struct vio_dev * __devinit vio_register_device(struct vio_dev *viodev)
 
 void __devinit vio_unregister_device(struct vio_dev *viodev)
 {
-	if (unregister_device_callback)
-		unregister_device_callback(viodev);
+	if (vio_bus_ops.unregister_device)
+		vio_bus_ops.unregister_device(viodev);
 	device_remove_file(&viodev->dev, &dev_attr_name);
 	device_unregister(&viodev->dev);
 }

drivers/scsi/ibmvscsi/rpa_vscsi.c

@@ -28,6 +28,7 @@
  */
 
 #include <asm/vio.h>
+#include <asm/prom.h>
 #include <asm/iommu.h>
 #include <asm/hvcall.h>
 #include <linux/dma-mapping.h>

include/asm-ppc64/vio.h

@@ -19,13 +19,14 @@
 #include <linux/errno.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
+
 #include <asm/hvcall.h>
-#include <asm/prom.h>
 #include <asm/scatterlist.h>
-/* 
+
+/*
  * Architecture-specific constants for drivers to
  * extract attributes of the device using vio_get_attribute()
-*/
+ */
 #define VETH_MAC_ADDR "local-mac-address"
 #define VETH_MCAST_FILTER_SIZE "ibm,mac-address-filters"
 
@@ -37,30 +38,19 @@
 #define VIO_IRQ_DISABLE		0UL
 #define VIO_IRQ_ENABLE		1UL
 
-struct vio_dev;
-struct vio_driver;
-struct vio_device_id;
 struct iommu_table;
 
-int vio_register_driver(struct vio_driver *drv);
-void vio_unregister_driver(struct vio_driver *drv);
-
-#ifdef CONFIG_PPC_PSERIES
-struct vio_dev * __devinit vio_register_device_node(
-		struct device_node *node_vdev);
-#endif
-void __devinit vio_unregister_device(struct vio_dev *dev);
-struct vio_dev *vio_find_node(struct device_node *vnode);
-
-const void * vio_get_attribute(struct vio_dev *vdev, void* which, int* length);
-int vio_get_irq(struct vio_dev *dev);
-int vio_enable_interrupts(struct vio_dev *dev);
-int vio_disable_interrupts(struct vio_dev *dev);
-extern struct vio_dev * __devinit vio_register_device(struct vio_dev *viodev);
-
-extern struct dma_mapping_ops vio_dma_ops;
-
-extern struct bus_type vio_bus_type;
+/*
+ * The vio_dev structure is used to describe virtual I/O devices.
+ */
+struct vio_dev {
+	struct iommu_table *iommu_table;     /* vio_map_* uses this */
+	char *name;
+	char *type;
+	uint32_t unit_address;
+	unsigned int irq;
+	struct device dev;
+};
 
 struct vio_device_id {
 	char *type;
@@ -70,42 +60,51 @@ struct vio_device_id {
 struct vio_driver {
 	struct list_head node;
 	char *name;
-	const struct vio_device_id *id_table;	/* NULL if wants all devices */
-	int  (*probe)  (struct vio_dev *dev, const struct vio_device_id *id);	/* New device inserted */
-	int (*remove) (struct vio_dev *dev);	/* Device removed (NULL if not a hot-plug capable driver) */
+	const struct vio_device_id *id_table;
+	int (*probe)(struct vio_dev *dev, const struct vio_device_id *id);
+	int (*remove)(struct vio_dev *dev);
 	unsigned long driver_data;
-
 	struct device_driver driver;
 };
 
+struct vio_bus_ops {
+	int (*match)(const struct vio_device_id *id, const struct vio_dev *dev);
+	void (*unregister_device)(struct vio_dev *);
+	void (*release_device)(struct device *);
+};
+
+extern struct dma_mapping_ops vio_dma_ops;
+extern struct bus_type vio_bus_type;
+extern struct vio_dev vio_bus_device;
+
+extern int vio_register_driver(struct vio_driver *drv);
+extern void vio_unregister_driver(struct vio_driver *drv);
+
+extern struct vio_dev * __devinit vio_register_device(struct vio_dev *viodev);
+extern void __devinit vio_unregister_device(struct vio_dev *dev);
+
+extern int vio_bus_init(struct vio_bus_ops *);
+
+#ifdef CONFIG_PPC_PSERIES
+struct device_node;
+
+extern struct vio_dev * __devinit vio_register_device_node(
+		struct device_node *node_vdev);
+extern struct vio_dev *vio_find_node(struct device_node *vnode);
+extern const void *vio_get_attribute(struct vio_dev *vdev, void *which,
+		int *length);
+extern int vio_enable_interrupts(struct vio_dev *dev);
+extern int vio_disable_interrupts(struct vio_dev *dev);
+#endif
+
 static inline struct vio_driver *to_vio_driver(struct device_driver *drv)
 {
 	return container_of(drv, struct vio_driver, driver);
 }
 
-/*
- * The vio_dev structure is used to describe virtual I/O devices.
- */
-struct vio_dev {
-	struct iommu_table *iommu_table;     /* vio_map_* uses this */
-	char *name;
-	char *type;
-	uint32_t unit_address;	
-	unsigned int irq;
-
-	struct device dev;
-};
-
-extern struct vio_dev vio_bus_device;
-
 static inline struct vio_dev *to_vio_dev(struct device *dev)
 {
 	return container_of(dev, struct vio_dev, dev);
 }
 
-extern int vio_bus_init(int (*is_match)(const struct vio_device_id *id,
-			const struct vio_dev *dev),
-		void (*)(struct vio_dev *),
-		void (*)(struct device *));
-
 #endif /* _ASM_VIO_H */