driver core: Move driver_data back to struct device

Having to allocate memory as part of dev_set_drvdata() is a problem
because that memory may never get freed if the device itself is not
created. So move driver_data back to struct device.

This is a partial revert of commit b4028437.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index d1d1c055b48e..5c94ac3e7972 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -673,6 +673,7 @@ struct acpi_dev_node {
  *              variants, which GPIO pins act in what additional roles, and so
  *              on.  This shrinks the "Board Support Packages" (BSPs) and
  *              minimizes board-specific #ifdefs in drivers.
+ * @driver_data: Private pointer for driver specific info.
  * @power:      For device power management.
  *              See Documentation/power/devices.txt for details.
  * @pm_domain:  Provide callbacks that are executed during system suspend,
@@ -734,6 +735,8 @@ struct device {
                                            device */
         void            *platform_data; /* Platform specific data, device
                                            core doesn't touch it */
+        void            *driver_data;   /* Driver data, set and get with
+                                           dev_set/get_drvdata */
         struct dev_pm_info      power;
         struct dev_pm_domain    *pm_domain;