1 files changed, 18 insertions, 1 deletions

diff --git a/drivers/input/input.c b/drivers/input/input.c
index b149c9434849..d3cdb139e962 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -29,6 +29,7 @@ MODULE_DESCRIPTION("Input core");
 MODULE_LICENSE("GPL");
 
 EXPORT_SYMBOL(input_allocate_device);
+EXPORT_SYMBOL(input_free_device);
 EXPORT_SYMBOL(input_register_device);
 EXPORT_SYMBOL(input_unregister_device);
 EXPORT_SYMBOL(input_register_handler);
@@ -872,6 +873,7 @@ struct input_dev *input_allocate_device(void)
                 dev->dynalloc = 1;
                 dev->cdev.class = &input_class;
                 class_device_initialize(&dev->cdev);
+                mutex_init(&dev->mutex);
                 INIT_LIST_HEAD(&dev->h_list);
                 INIT_LIST_HEAD(&dev->node);
         }
@@ -879,6 +881,18 @@ struct input_dev *input_allocate_device(void)
         return dev;
 }
 
+void input_free_device(struct input_dev *dev)
+{
+        if (dev) {
+
+                mutex_lock(&dev->mutex);
+                dev->name = dev->phys = dev->uniq = NULL;
+                mutex_unlock(&dev->mutex);
+
+                input_put_device(dev);
+        }
+}
+
 int input_register_device(struct input_dev *dev)
 {
         static atomic_t input_no = ATOMIC_INIT(0);
@@ -895,7 +909,6 @@ int input_register_device(struct input_dev *dev)
                 return -EINVAL;
         }
 
-        mutex_init(&dev->mutex);
         set_bit(EV_SYN, dev->evbit);
 
         /*
@@ -979,6 +992,10 @@ void input_unregister_device(struct input_dev *dev)
         sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
         class_device_unregister(&dev->cdev);
 
+        mutex_lock(&dev->mutex);
+        dev->name = dev->phys = dev->uniq = NULL;
+        mutex_unlock(&dev->mutex);
+
         input_wakeup_procfs_readers();
 }