diff options
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-device.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/media/v4l2-core/v4l2-device.c b/drivers/media/v4l2-core/v4l2-device.c index 2dbfebc0ca85..02d1b6327117 100644 --- a/drivers/media/v4l2-core/v4l2-device.c +++ b/drivers/media/v4l2-core/v4l2-device.c @@ -44,7 +44,8 @@ int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev) v4l2_dev->dev = dev; if (dev == NULL) { /* If dev == NULL, then name must be filled in by the caller */ - WARN_ON(!v4l2_dev->name[0]); + if (WARN_ON(!v4l2_dev->name[0])) + return -EINVAL; return 0; } @@ -105,7 +106,9 @@ void v4l2_device_unregister(struct v4l2_device *v4l2_dev) { struct v4l2_subdev *sd, *next; - if (v4l2_dev == NULL) + /* Just return if v4l2_dev is NULL or if it was already + * unregistered before. */ + if (v4l2_dev == NULL || !v4l2_dev->name[0]) return; v4l2_device_disconnect(v4l2_dev); @@ -135,6 +138,8 @@ void v4l2_device_unregister(struct v4l2_device *v4l2_dev) } #endif } + /* Mark as unregistered, thus preventing duplicate unregistrations */ + v4l2_dev->name[0] = '\0'; } EXPORT_SYMBOL_GPL(v4l2_device_unregister); |