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, 46 insertions, 15 deletions

diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
index 664bcc8116fc..007e72f80251 100644
--- a/drivers/input/mousedev.c
+++ b/drivers/input/mousedev.c
@@ -624,23 +624,27 @@ static const struct file_operations mousedev_fops = {
         .fasync =       mousedev_fasync,
 };
 
-static struct input_handle *mousedev_connect(struct input_handler *handler, struct input_dev *dev,
-                                             const struct input_device_id *id)
+static int mousedev_connect(struct input_handler *handler, struct input_dev *dev,
+                            const struct input_device_id *id)
 {
         struct mousedev *mousedev;
         struct class_device *cdev;
-        int minor = 0;
+        dev_t devt;
+        int minor;
+        int error;
 
         for (minor = 0; minor < MOUSEDEV_MINORS && mousedev_table[minor]; minor++);
         if (minor == MOUSEDEV_MINORS) {
                 printk(KERN_ERR "mousedev: no more free mousedev devices\n");
-                return NULL;
+                return -ENFILE;
         }
 
-        if (!(mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL)))
-                return NULL;
+        mousedev = kzalloc(sizeof(struct mousedev), GFP_KERNEL);
+        if (!mousedev)
+                return -ENOMEM;
 
         INIT_LIST_HEAD(&mousedev->list);
+        INIT_LIST_HEAD(&mousedev->mixdev_node);
         init_waitqueue_head(&mousedev->wait);
 
         mousedev->minor = minor;
@@ -651,20 +655,45 @@ static struct input_handle *mousedev_connect(struct input_handler *handler, stru
         mousedev->handle.private = mousedev;
         sprintf(mousedev->name, "mouse%d", minor);
 
-        if (mousedev_mix.open)
-                input_open_device(&mousedev->handle);
-
         mousedev_table[minor] = mousedev;
 
-        cdev = class_device_create(&input_class, &dev->cdev,
-                        MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
-                        dev->cdev.dev, mousedev->name);
+        devt = MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + minor),
+
+        cdev = class_device_create(&input_class, &dev->cdev, devt,
+                                   dev->cdev.dev, mousedev->name);
+        if (IS_ERR(cdev)) {
+                error = PTR_ERR(cdev);
+                goto err_free_mousedev;
+        }
 
         /* temporary symlink to keep userspace happy */
-        sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
-                          mousedev->name);
+        error = sysfs_create_link(&input_class.subsys.kset.kobj,
+                                  &cdev->kobj, mousedev->name);
+        if (error)
+                goto err_cdev_destroy;
 
-        return &mousedev->handle;
+        error = input_register_handle(&mousedev->handle);
+        if (error)
+                goto err_remove_link;
+
+        if (mousedev_mix.open) {
+                error = input_open_device(&mousedev->handle);
+                if (error)
+                        goto err_unregister_handle;
+        }
+
+        return 0;
+
+ err_unregister_handle:
+        input_unregister_handle(&mousedev->handle);
+ err_remove_link:
+        sysfs_remove_link(&input_class.subsys.kset.kobj, mousedev->name);
+ err_cdev_destroy:
+        class_device_destroy(&input_class, devt);
+ err_free_mousedev:
+        mousedev_table[minor] = NULL;
+        kfree(mousedev);
+        return error;
 }
 
 static void mousedev_disconnect(struct input_handle *handle)
@@ -672,6 +701,8 @@ static void mousedev_disconnect(struct input_handle *handle)
         struct mousedev *mousedev = handle->private;
         struct mousedev_list *list;
 
+        input_unregister_handle(handle);
+
         sysfs_remove_link(&input_class.subsys.kset.kobj, mousedev->name);
         class_device_destroy(&input_class,
                         MKDEV(INPUT_MAJOR, MOUSEDEV_MINOR_BASE + mousedev->minor));