Input: make sure input interfaces pin parent input devices

Recent driver core change causes references to parent devices being
dropped early, at device_del() time, as opposed to when all children
are freed. This causes oops in evdev with grabbed devices. Take the
reference to the parent input device ourselves to ensure that it
stays around long enough.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 99562cee827e..b32984bc516f 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -124,6 +124,7 @@ static void evdev_free(struct device *dev)
 {
         struct evdev *evdev = container_of(dev, struct evdev, dev);
 
+        input_put_device(evdev->handle.dev);
         kfree(evdev);
 }
 
@@ -853,9 +854,6 @@ static void evdev_cleanup(struct evdev *evdev)
         evdev_hangup(evdev);
         evdev_remove_chrdev(evdev);
 
-        if (evdev->grab)
-                evdev_ungrab(evdev, evdev->grab);
-
         /* evdev is marked dead so no one else accesses evdev->open */
         if (evdev->open) {
                 input_flush_device(handle, NULL);
@@ -896,7 +894,7 @@ static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
         evdev->exist = 1;
         evdev->minor = minor;
 
-        evdev->handle.dev = dev;
+        evdev->handle.dev = input_get_device(dev);
         evdev->handle.name = evdev->name;
         evdev->handle.handler = handler;
         evdev->handle.private = evdev;