Input: rework handle creation code

 - consolidate code for binding handlers to a device
 - return error codes from handlers connect() methods back to input
   core and log failures

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

1 files changed, 20 insertions, 8 deletions

diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index 3d211e8553f7..59712546f911 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -41,7 +41,6 @@
 #include <linux/input.h>
 #include <linux/reboot.h>
 
-static void kbd_disconnect(struct input_handle *handle);
 extern void ctrl_alt_del(void);
 
 /*
@@ -1260,11 +1259,11 @@ static void kbd_event(struct input_handle *handle, unsigned int event_type,
  * likes it, it can open it and get events from it. In this (kbd_connect)
  * function, we should decide which VT to bind that keyboard to initially.
  */
-static struct input_handle *kbd_connect(struct input_handler *handler,
-                                        struct input_dev *dev,
-                                        const struct input_device_id *id)
+static int kbd_connect(struct input_handler *handler, struct input_dev *dev,
+                        const struct input_device_id *id)
 {
         struct input_handle *handle;
+        int error;
         int i;
 
         for (i = KEY_RESERVED; i < BTN_MISC; i++)
@@ -1272,24 +1271,37 @@ static struct input_handle *kbd_connect(struct input_handler *handler,
                         break;
 
         if (i == BTN_MISC && !test_bit(EV_SND, dev->evbit))
-                return NULL;
+                return -ENODEV;
 
         handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
         if (!handle)
-                return NULL;
+                return -ENOMEM;
 
         handle->dev = dev;
         handle->handler = handler;
         handle->name = "kbd";
 
-        input_open_device(handle);
+        error = input_register_handle(handle);
+        if (error)
+                goto err_free_handle;
+
+        error = input_open_device(handle);
+        if (error)
+                goto err_unregister_handle;
+
+        return 0;
 
-        return handle;
+ err_unregister_handle:
+        input_unregister_handle(handle);
+ err_free_handle:
+        kfree(handle);
+        return error;
 }
 
 static void kbd_disconnect(struct input_handle *handle)
 {
         input_close_device(handle);
+        input_unregister_handle(handle);
         kfree(handle);
 }