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>
diff --git a/drivers/base/base.h b/drivers/base/base.h
index ca2b037..62a2cb5 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -63,6 +63,18 @@
#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 059966b..16d8599 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -109,6 +109,7 @@
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 @@
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 = {
@@ -859,6 +861,13 @@
if (!dev)
goto done;
+ dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
+ if (!dev->p) {
+ error = -ENOMEM;
+ goto done;
+ }
+ dev->p->device = dev;
+
/*
* for statically allocated devices, which should all be converted
* some day, we need to initialize the name. We prevent reading back