driver core: move klist_children into private structure
Greg Kroah-Hartman [Tue, 16 Dec 2008 20:24:56 +0000 (12:24 -0800)]
Nothing outside of the driver core should ever touch klist_children, or
knode_parent, so move them out of the public eye.

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

drivers/base/base.h
drivers/base/core.c
include/linux/device.h

index 6b20809..f5cf31c 100644 (file)
@@ -66,14 +66,20 @@ struct class_private {
 /**
  * struct device_private - structure to hold the private to the driver core portions of the device structure.
  *
+ * @klist_children - klist containing all children of this device
+ * @knode_parent - node in sibling list
  * @device - pointer back to the struct class that this structure is
  * associated with.
  *
  * Nothing outside of the driver core should ever touch these fields.
  */
 struct device_private {
+       struct klist klist_children;
+       struct klist_node knode_parent;
        struct device *device;
 };
+#define to_device_private_parent(obj)  \
+       container_of(obj, struct device_private, knode_parent)
 
 /* initialisation functions */
 extern int devices_init(void);
index 6657787..180ff84 100644 (file)
@@ -509,14 +509,16 @@ EXPORT_SYMBOL_GPL(device_schedule_callback_owner);
 
 static void klist_children_get(struct klist_node *n)
 {
-       struct device *dev = container_of(n, struct device, knode_parent);
+       struct device_private *p = to_device_private_parent(n);
+       struct device *dev = p->device;
 
        get_device(dev);
 }
 
 static void klist_children_put(struct klist_node *n)
 {
-       struct device *dev = container_of(n, struct device, knode_parent);
+       struct device_private *p = to_device_private_parent(n);
+       struct device *dev = p->device;
 
        put_device(dev);
 }
@@ -546,7 +548,7 @@ void device_initialize(struct device *dev)
        dev->p->device = dev;
        dev->kobj.kset = devices_kset;
        kobject_init(&dev->kobj, &device_ktype);
-       klist_init(&dev->klist_children, klist_children_get,
+       klist_init(&dev->p->klist_children, klist_children_get,
                   klist_children_put);
        INIT_LIST_HEAD(&dev->dma_pools);
        init_MUTEX(&dev->sem);
@@ -927,7 +929,8 @@ int device_add(struct device *dev)
        kobject_uevent(&dev->kobj, KOBJ_ADD);
        bus_attach_device(dev);
        if (parent)
-               klist_add_tail(&dev->knode_parent, &parent->klist_children);
+               klist_add_tail(&dev->p->knode_parent,
+                              &parent->p->klist_children);
 
        if (dev->class) {
                mutex_lock(&dev->class->p->class_mutex);
@@ -1038,7 +1041,7 @@ void device_del(struct device *dev)
        device_pm_remove(dev);
        dpm_sysfs_remove(dev);
        if (parent)
-               klist_del(&dev->knode_parent);
+               klist_del(&dev->p->knode_parent);
        if (MAJOR(dev->devt)) {
                device_remove_sys_dev_entry(dev);
                device_remove_file(dev, &devt_attr);
@@ -1102,7 +1105,14 @@ void device_unregister(struct device *dev)
 static struct device *next_device(struct klist_iter *i)
 {
        struct klist_node *n = klist_next(i);
-       return n ? container_of(n, struct device, knode_parent) : NULL;
+       struct device *dev = NULL;
+       struct device_private *p;
+
+       if (n) {
+               p = to_device_private_parent(n);
+               dev = p->device;
+       }
+       return dev;
 }
 
 /**
@@ -1124,7 +1134,7 @@ int device_for_each_child(struct device *parent, void *data,
        struct device *child;
        int error = 0;
 
-       klist_iter_init(&parent->klist_children, &i);
+       klist_iter_init(&parent->p->klist_children, &i);
        while ((child = next_device(&i)) && !error)
                error = fn(child, data);
        klist_iter_exit(&i);
@@ -1155,7 +1165,7 @@ struct device *device_find_child(struct device *parent, void *data,
        if (!parent)
                return NULL;
 
-       klist_iter_init(&parent->klist_children, &i);
+       klist_iter_init(&parent->p->klist_children, &i);
        while ((child = next_device(&i)))
                if (match(child, data) && get_device(child))
                        break;
@@ -1478,9 +1488,10 @@ int device_move(struct device *dev, struct device *new_parent)
        old_parent = dev->parent;
        dev->parent = new_parent;
        if (old_parent)
-               klist_remove(&dev->knode_parent);
+               klist_remove(&dev->p->knode_parent);
        if (new_parent) {
-               klist_add_tail(&dev->knode_parent, &new_parent->klist_children);
+               klist_add_tail(&dev->p->knode_parent,
+                              &new_parent->p->klist_children);
                set_dev_node(dev, dev_to_node(new_parent));
        }
 
@@ -1492,11 +1503,11 @@ int device_move(struct device *dev, struct device *new_parent)
                device_move_class_links(dev, new_parent, old_parent);
                if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
                        if (new_parent)
-                               klist_remove(&dev->knode_parent);
+                               klist_remove(&dev->p->knode_parent);
                        dev->parent = old_parent;
                        if (old_parent) {
-                               klist_add_tail(&dev->knode_parent,
-                                              &old_parent->klist_children);
+                               klist_add_tail(&dev->p->knode_parent,
+                                              &old_parent->p->klist_children);
                                set_dev_node(dev, dev_to_node(old_parent));
                        }
                }
index d6d3408..60423e6 100644 (file)
@@ -366,8 +366,6 @@ struct device_dma_parameters {
 };
 
 struct device {
-       struct klist            klist_children;
-       struct klist_node       knode_parent;   /* node in sibling list */
        struct klist_node       knode_driver;
        struct klist_node       knode_bus;
        struct device           *parent;