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authorGreg Kroah-Hartman <gregkh@suse.de>2008-12-16 23:23:36 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2009-01-06 21:44:32 +0300
commit2831fe6f9cc4e16c103504ee09a47a084297c0f3 (patch)
tree36869b2a4ad9dce0fb0812f44355233e907afa95
parent2e5ba26a483218b51b7b327fb235b348890aea15 (diff)
downloadlinux-2831fe6f9cc4e16c103504ee09a47a084297c0f3.tar.xz
driver core: create a private portion of struct device
This is to be used to move things out of struct device that no code outside of the driver core should ever touch. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/base/base.h12
-rw-r--r--drivers/base/core.c8
-rw-r--r--include/linux/device.h3
3 files changed, 23 insertions, 0 deletions
diff --git a/drivers/base/base.h b/drivers/base/base.h
index 0a5f055dffba..6b20809b5fd4 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -63,6 +63,18 @@ struct class_private {
#define to_class(obj) \
container_of(obj, struct class_private, class_subsys.kobj)
+/**
+ * struct device_private - structure to hold the private to the driver core portions of the device structure.
+ *
+ * @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 device *device;
+};
+
/* 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 14aa2b6953c9..6657787e64f8 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -109,6 +109,7 @@ static struct sysfs_ops dev_sysfs_ops = {
static void device_release(struct kobject *kobj)
{
struct device *dev = to_dev(kobj);
+ struct device_private *p = dev->p;
if (dev->release)
dev->release(dev);
@@ -120,6 +121,7 @@ static void device_release(struct kobject *kobj)
WARN(1, KERN_ERR "Device '%s' does not have a release() "
"function, it is broken and must be fixed.\n",
dev_name(dev));
+ kfree(p);
}
static struct kobj_type device_ktype = {
@@ -536,6 +538,12 @@ static void klist_children_put(struct klist_node *n)
*/
void device_initialize(struct device *dev)
{
+ dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
+ if (!dev->p) {
+ WARN_ON(1);
+ return;
+ }
+ dev->p->device = dev;
dev->kobj.kset = devices_kset;
kobject_init(&dev->kobj, &device_ktype);
klist_init(&dev->klist_children, klist_children_get,
diff --git a/include/linux/device.h b/include/linux/device.h
index 4e14fad41430..d6d34084fd37 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -28,6 +28,7 @@
#define BUS_ID_SIZE 20
struct device;
+struct device_private;
struct device_driver;
struct driver_private;
struct class;
@@ -371,6 +372,8 @@ struct device {
struct klist_node knode_bus;
struct device *parent;
+ struct device_private *p;
+
struct kobject kobj;
char bus_id[BUS_ID_SIZE]; /* position on parent bus */
unsigned uevent_suppress:1;