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, 36 insertions, 11 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 64b47de052bb..840fa1986527 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -605,21 +605,24 @@ static const struct file_operations evdev_fops = {
         .flush =        evdev_flush
 };
 
-static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev,
-                                          const struct input_device_id *id)
+static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
+                         const struct input_device_id *id)
 {
         struct evdev *evdev;
         struct class_device *cdev;
+        dev_t devt;
         int minor;
+        int error;
 
         for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
         if (minor == EVDEV_MINORS) {
                 printk(KERN_ERR "evdev: no more free evdev devices\n");
-                return NULL;
+                return -ENFILE;
         }
 
-        if (!(evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL)))
-                return NULL;
+        evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
+        if (!evdev)
+                return -ENOMEM;
 
         INIT_LIST_HEAD(&evdev->list);
         init_waitqueue_head(&evdev->wait);
@@ -634,15 +637,35 @@ static struct input_handle *evdev_connect(struct input_handler *handler, struct
 
         evdev_table[minor] = evdev;
 
-        cdev = class_device_create(&input_class, &dev->cdev,
-                        MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
-                        dev->cdev.dev, evdev->name);
+        devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
+
+        cdev = class_device_create(&input_class, &dev->cdev, devt,
+                                   dev->cdev.dev, evdev->name);
+        if (IS_ERR(cdev)) {
+                error = PTR_ERR(cdev);
+                goto err_free_evdev;
+        }
 
         /* temporary symlink to keep userspace happy */
-        sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
-                          evdev->name);
+        error = sysfs_create_link(&input_class.subsys.kset.kobj,
+                                  &cdev->kobj, evdev->name);
+        if (error)
+                goto err_cdev_destroy;
+
+        error = input_register_handle(&evdev->handle);
+        if (error)
+                goto err_remove_link;
 
-        return &evdev->handle;
+        return 0;
+
+ err_remove_link:
+        sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
+ err_cdev_destroy:
+        class_device_destroy(&input_class, devt);
+ err_free_evdev:
+        kfree(evdev);
+        evdev_table[minor] = NULL;
+        return error;
 }
 
 static void evdev_disconnect(struct input_handle *handle)
@@ -650,6 +673,8 @@ static void evdev_disconnect(struct input_handle *handle)
         struct evdev *evdev = handle->private;
         struct evdev_list *list;
 
+        input_unregister_handle(handle);
+
         sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name);
         class_device_destroy(&input_class,
                         MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));