ACPI: video - add missing input_free_device()

If input_register_device() fails input_free_device() must
be called to release memory allocated for the device.
Also consolidate error handling in acpi_bus_video_add()
and handle input_allocate_device() failures.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index c0e4e74..be66a7c 100644 (file)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -1897,14 +1897,10 @@ static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
 static int instance;
 static int acpi_video_bus_add(struct acpi_device *device)
 {
-       int result = 0;
-       acpi_status status = 0;
-       struct acpi_video_bus *video = NULL;
+       acpi_status status;
+       struct acpi_video_bus *video;
        struct input_dev *input;
-
-
-       if (!device)
-               return -EINVAL;
+       int error;
 
        video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
        if (!video)
@@ -1923,13 +1919,13 @@ static int acpi_video_bus_add(struct acpi_device *device)
        acpi_driver_data(device) = video;
 
        acpi_video_bus_find_cap(video);
-       result = acpi_video_bus_check(video);
-       if (result)
-               goto end;
+       error = acpi_video_bus_check(video);
+       if (error)
+               goto err_free_video;
 
-       result = acpi_video_bus_add_fs(device);
-       if (result)
-               goto end;
+       error = acpi_video_bus_add_fs(device);
+       if (error)
+               goto err_free_video;
 
        init_MUTEX(&video->sem);
        INIT_LIST_HEAD(&video->video_device_list);
@@ -1943,16 +1939,15 @@ static int acpi_video_bus_add(struct acpi_device *device)
        if (ACPI_FAILURE(status)) {
                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                                  "Error installing notify handler\n"));
-               acpi_video_bus_stop_devices(video);
-               acpi_video_bus_put_devices(video);
-               kfree(video->attached_array);
-               acpi_video_bus_remove_fs(device);
-               result = -ENODEV;
-               goto end;
+               error = -ENODEV;
+               goto err_stop_video;
        }
 
-
        video->input = input = input_allocate_device();
+       if (!input) {
+               error = -ENOMEM;
+               goto err_uninstall_notify;
+       }
 
        snprintf(video->phys, sizeof(video->phys),
                "%s/video/input0", acpi_device_hid(video->device));
@@ -1972,18 +1967,10 @@ static int acpi_video_bus_add(struct acpi_device *device)
        set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
        set_bit(KEY_DISPLAY_OFF, input->keybit);
        set_bit(KEY_UNKNOWN, input->keybit);
-       result = input_register_device(input);
-       if (result) {
-               acpi_remove_notify_handler(video->device->handle,
-                                               ACPI_DEVICE_NOTIFY,
-                                               acpi_video_bus_notify);
-               acpi_video_bus_stop_devices(video);
-               acpi_video_bus_put_devices(video);
-               kfree(video->attached_array);
-               acpi_video_bus_remove_fs(device);
-               goto end;
-        }
 
+       error = input_register_device(input);
+       if (error)
+               goto err_free_input_dev;
 
        printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
               ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
@@ -1991,11 +1978,23 @@ static int acpi_video_bus_add(struct acpi_device *device)
               video->flags.rom ? "yes" : "no",
               video->flags.post ? "yes" : "no");
 
- end:
-       if (result)
-               kfree(video);
+       return 0;
+
+ err_free_input_dev:
+       input_free_device(input);
+ err_uninstall_notify:
+       acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
+                                  acpi_video_bus_notify);
+ err_stop_video:
+       acpi_video_bus_stop_devices(video);
+       acpi_video_bus_put_devices(video);
+       kfree(video->attached_array);
+       acpi_video_bus_remove_fs(device);
+ err_free_video:
+       kfree(video);
+       acpi_driver_data(device) = NULL;
 
-       return result;
+       return error;
 }
 
 static int acpi_video_bus_remove(struct acpi_device *device, int type)