Input: handle failures in input_register_device()

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

diff --git a/drivers/input/input.c b/drivers/input/input.c
index c8ae2bb054e026c4e4e2cf44214c26316737f0dc..bdd2a7fc268dac799210be077f223a56b3255a31 100644 (file)
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -536,7 +536,7 @@ static struct attribute *input_dev_attrs[] = {
        NULL
 };
 
-static struct attribute_group input_dev_group = {
+static struct attribute_group input_dev_attr_group = {
        .attrs  = input_dev_attrs,
 };
 
@@ -717,35 +717,14 @@ struct input_dev *input_allocate_device(void)
        return dev;
 }
 
-static void input_register_classdevice(struct input_dev *dev)
-{
-       static atomic_t input_no = ATOMIC_INIT(0);
-       const char *path;
-
-       __module_get(THIS_MODULE);
-
-       dev->dev = dev->cdev.dev;
-
-       snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
-                "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
-
-       path = kobject_get_path(&dev->cdev.class->subsys.kset.kobj, GFP_KERNEL);
-       printk(KERN_INFO "input: %s as %s/%s\n",
-               dev->name ? dev->name : "Unspecified device",
-               path ? path : "", dev->cdev.class_id);
-       kfree(path);
-
-       class_device_add(&dev->cdev);
-       sysfs_create_group(&dev->cdev.kobj, &input_dev_group);
-       sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
-       sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
-}
-
 int input_register_device(struct input_dev *dev)
 {
+       static atomic_t input_no = ATOMIC_INIT(0);
        struct input_handle *handle;
        struct input_handler *handler;
        struct input_device_id *id;
+       const char *path;
+       int error;
 
        if (!dev->dynalloc) {
                printk(KERN_WARNING "input: device %s is statically allocated, will not register\n"
@@ -773,7 +752,32 @@ int input_register_device(struct input_dev *dev)
        INIT_LIST_HEAD(&dev->h_list);
        list_add_tail(&dev->node, &input_dev_list);
 
-       input_register_classdevice(dev);
+       dev->cdev.class = &input_class;
+       snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
+                "input%ld", (unsigned long) atomic_inc_return(&input_no) - 1);
+
+       error = class_device_add(&dev->cdev);
+       if (error)
+               return error;
+
+       error = sysfs_create_group(&dev->cdev.kobj, &input_dev_attr_group);
+       if (error)
+               goto fail1;
+
+       error = sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
+       if (error)
+               goto fail2;
+
+       error = sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
+       if (error)
+               goto fail3;
+
+       __module_get(THIS_MODULE);
+
+       path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
+       printk(KERN_INFO "input: %s as %s\n",
+               dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
+       kfree(path);
 
        list_for_each_entry(handler, &input_handler_list, node)
                if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
@@ -784,6 +788,11 @@ int input_register_device(struct input_dev *dev)
        input_wakeup_procfs_readers();
 
        return 0;
+
+ fail3:        sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
+ fail2:        sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
+ fail1:        class_device_del(&dev->cdev);
+       return error;
 }
 
 void input_unregister_device(struct input_dev *dev)
@@ -805,7 +814,7 @@ void input_unregister_device(struct input_dev *dev)
 
        sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
        sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
-       sysfs_remove_group(&dev->cdev.kobj, &input_dev_group);
+       sysfs_remove_group(&dev->cdev.kobj, &input_dev_attr_group);
        class_device_unregister(&dev->cdev);
 
        input_wakeup_procfs_readers();