driver-core: Move kobj_to_dev from genhd.h to device.h

This function is not really specific to the genhd layer and there are various
re-implementations or open-coded variants of it all throughout the kernel. To
avoid further duplications move the function to a more generic place.

While moving also convert it from a macro to a inline function.

Potential users of this function can be detected and converted using the
following coccinelle patch:

// <smpl>
@@
expression k;
@@
-container_of(k, struct device, kobj)
+kobj_to_dev(kobj)
// </smpl>

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index 161d96241b1..5c4495c8fe3 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -689,6 +689,11 @@ struct device {
 	void	(*release)(struct device *dev);
 };
 
+static inline struct device *kobj_to_dev(struct kobject *kobj)
+{
+	return container_of(kobj, struct device, kobj);
+}
+
 /* Get the wakeup routines, which depend on struct device */
 #include <linux/pm_wakeup.h>