Driver core: move dev_get/set_drvdata to drivers/base/dd.c

No one should directly access the driver_data field, so remove the field
and make it private.  We dynamically create the private field now if it
is needed, to handle drivers that call get/set before they are
registered with the driver core.

Also update the copyright notices on these files while we are there.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 52 insertions, 20 deletions

diff --git a/drivers/base/base.h b/drivers/base/base.h
index 1e52c125f437..503d59c57501 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -70,6 +70,8 @@ struct class_private {
  * @knode_parent - node in sibling list
  * @knode_driver - node in driver list
  * @knode_bus - node in bus list
+ * @driver_data - private pointer for driver specific info.  Will turn into a
+ * list soon.
  * @device - pointer back to the struct class that this structure is
  * associated with.
  *
@@ -80,6 +82,7 @@ struct device_private {
         struct klist_node knode_parent;
         struct klist_node knode_driver;
         struct klist_node knode_bus;
+        void *driver_data;
         struct device *device;
 };
 #define to_device_private_parent(obj)   \
@@ -89,6 +92,8 @@ struct device_private {
 #define to_device_private_bus(obj)      \
         container_of(obj, struct device_private, knode_bus)
 
+extern int device_private_init(struct device *dev);
+
 /* initialisation functions */
 extern int devices_init(void);
 extern int buses_init(void);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index c34774d0b9d3..99dfe96fffcb 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -843,6 +843,17 @@ static void device_remove_sys_dev_entry(struct device *dev)
         }
 }
 
+int device_private_init(struct device *dev)
+{
+        dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
+        if (!dev->p)
+                return -ENOMEM;
+        dev->p->device = dev;
+        klist_init(&dev->p->klist_children, klist_children_get,
+                   klist_children_put);
+        return 0;
+}
+
 /**
  * device_add - add device to device hierarchy.
  * @dev: device.
@@ -868,14 +879,11 @@ int device_add(struct device *dev)
         if (!dev)
                 goto done;
 
-        dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
         if (!dev->p) {
-                error = -ENOMEM;
-                goto done;
+                error = device_private_init(dev);
+                if (error)
+                        goto done;
         }
-        dev->p->device = dev;
-        klist_init(&dev->p->klist_children, klist_children_get,
-                   klist_children_put);
 
         /*
          * for statically allocated devices, which should all be converted
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 7b34b3a48f67..979d159b5cd1 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -11,8 +11,8 @@
  *
  * Copyright (c) 2002-5 Patrick Mochel
  * Copyright (c) 2002-3 Open Source Development Labs
- * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de>
- * Copyright (c) 2007 Novell Inc.
+ * Copyright (c) 2007-2009 Greg Kroah-Hartman <gregkh@suse.de>
+ * Copyright (c) 2007-2009 Novell Inc.
  *
  * This file is released under the GPLv2
  */
@@ -391,3 +391,30 @@ void driver_detach(struct device_driver *drv)
                 put_device(dev);
         }
 }
+
+/*
+ * These exports can't be _GPL due to .h files using this within them, and it
+ * might break something that was previously working...
+ */
+void *dev_get_drvdata(const struct device *dev)
+{
+        if (dev && dev->p)
+                return dev->p->driver_data;
+        return NULL;
+}
+EXPORT_SYMBOL(dev_get_drvdata);
+
+void dev_set_drvdata(struct device *dev, void *data)
+{
+        int error;
+
+        if (!dev)
+                return;
+        if (!dev->p) {
+                error = device_private_init(dev);
+                if (error)
+                        return;
+        }
+        dev->p->driver_data = data;
+}
+EXPORT_SYMBOL(dev_set_drvdata);
diff --git a/include/linux/device.h b/include/linux/device.h
index a28642975053..c0bd23048be0 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -2,7 +2,8 @@
  * device.h - generic, centralized driver model
  *
  * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
- * Copyright (c) 2004-2007 Greg Kroah-Hartman <gregkh@suse.de>
+ * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
+ * Copyright (c) 2008-2009 Novell Inc.
  *
  * This file is released under the GPLv2
  *
@@ -381,7 +382,6 @@ struct device {
         struct bus_type *bus;           /* type of bus device is on */
         struct device_driver *driver;   /* which driver has allocated this
                                            device */
-        void            *driver_data;   /* data private to the driver */
         void            *platform_data; /* Platform specific data, device
                                            core doesn't touch it */
         struct dev_pm_info      power;
@@ -447,16 +447,6 @@ static inline void set_dev_node(struct device *dev, int node)
 }
 #endif
 
-static inline void *dev_get_drvdata(const struct device *dev)
-{
-        return dev->driver_data;
-}
-
-static inline void dev_set_drvdata(struct device *dev, void *data)
-{
-        dev->driver_data = data;
-}
-
 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
 {
         return dev->kobj.uevent_suppress;
@@ -490,6 +480,8 @@ extern int device_rename(struct device *dev, char *new_name);
 extern int device_move(struct device *dev, struct device *new_parent,
                        enum dpm_order dpm_order);
 extern const char *device_get_nodename(struct device *dev, const char **tmp);
+extern void *dev_get_drvdata(const struct device *dev);
+extern void dev_set_drvdata(struct device *dev, void *data);
 
 /*
  * Root device objects for grouping under /sys/devices