ACPI: dock: send envp with uevent

Send an env along with our KOBJ_CHANGE uevent so that user space has
the option of checking for that to see if a dock or undock has occurred.

Signed-off-by:  Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 4efc12cf6173..dc3df93d2310 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -336,11 +336,19 @@ static void hotplug_dock_devices(struct dock_station *ds, u32 event)
 static void dock_event(struct dock_station *ds, u32 event, int num)
 {
         struct device *dev = &dock_device->dev;
+        char event_string[7];
+        char *envp[] = { event_string, NULL };
+
+        if (num == UNDOCK_EVENT)
+                sprintf(event_string, "UNDOCK");
+        else
+                sprintf(event_string, "DOCK");
+
         /*
          * Indicate that the status of the dock station has
          * changed.
          */
-        kobject_uevent(&dev->kobj, KOBJ_CHANGE);
+        kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 }
 
 /**