usb: gadget: uvc: configfs: Don't wrap groups unnecessarily

Various configfs groups (represented by config_group) are wrapped in
structures that they're the only member of. This allows adding other
data fields to groups, but it unnecessarily makes the code more complex.
Remove the outer structures and use config_group directly to simplify
the code. Groups can still be wrapped individually in the future if
other data fields need to be added.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

drivers/usb/gadget/function/uvc_configfs.c

@@ -162,9 +162,7 @@ static void uvcg_control_header_drop(struct config_group *group,
 }
 
 /* control/header */
-static struct uvcg_control_header_grp {
-	struct config_group	group;
-} uvcg_control_header_grp;
+static struct config_group uvcg_control_header_grp;
 
 static struct configfs_group_operations uvcg_control_header_grp_ops = {
 	.make_item		= uvcg_control_header_make,
@@ -177,31 +175,22 @@ static const struct config_item_type uvcg_control_header_grp_type = {
 };
 
 /* control/processing/default */
-static struct uvcg_default_processing {
-	struct config_group	group;
-} uvcg_default_processing;
-
-static inline struct uvcg_default_processing
-*to_uvcg_default_processing(struct config_item *item)
-{
-	return container_of(to_config_group(item),
-			    struct uvcg_default_processing, group);
-}
+static struct config_group uvcg_default_processing_grp;
 
 #define UVCG_DEFAULT_PROCESSING_ATTR(cname, aname, conv)		\
 static ssize_t uvcg_default_processing_##cname##_show(			\
 	struct config_item *item, char *page)				\
 {									\
-	struct uvcg_default_processing *dp = to_uvcg_default_processing(item); \
+	struct config_group *group = to_config_group(item);		\
 	struct f_uvc_opts *opts;					\
 	struct config_item *opts_item;					\
-	struct mutex *su_mutex = &dp->group.cg_subsys->su_mutex;	\
+	struct mutex *su_mutex = &group->cg_subsys->su_mutex;		\
 	struct uvc_processing_unit_descriptor *pd;			\
 	int result;							\
 									\
 	mutex_lock(su_mutex); /* for navigating configfs hierarchy */	\
 									\
-	opts_item = dp->group.cg_item.ci_parent->ci_parent->ci_parent;	\
+	opts_item = group->cg_item.ci_parent->ci_parent->ci_parent;	\
 	opts = to_f_uvc_opts(opts_item);				\
 	pd = &opts->uvc_processing;					\
 									\
@@ -229,17 +218,17 @@ UVCG_DEFAULT_PROCESSING_ATTR(i_processing, iProcessing, identity_conv);
 static ssize_t uvcg_default_processing_bm_controls_show(
 	struct config_item *item, char *page)
 {
-	struct uvcg_default_processing *dp = to_uvcg_default_processing(item);
+	struct config_group *group = to_config_group(item);
 	struct f_uvc_opts *opts;
 	struct config_item *opts_item;
-	struct mutex *su_mutex = &dp->group.cg_subsys->su_mutex;
+	struct mutex *su_mutex = &group->cg_subsys->su_mutex;
 	struct uvc_processing_unit_descriptor *pd;
 	int result, i;
 	char *pg = page;
 
 	mutex_lock(su_mutex); /* for navigating configfs hierarchy */
 
-	opts_item = dp->group.cg_item.ci_parent->ci_parent->ci_parent;
+	opts_item = group->cg_item.ci_parent->ci_parent->ci_parent;
 	opts = to_f_uvc_opts(opts_item);
 	pd = &opts->uvc_processing;
 
@@ -274,40 +263,29 @@ static const struct config_item_type uvcg_default_processing_type = {
 /* struct uvcg_processing {}; */
 
 /* control/processing */
-static struct uvcg_processing_grp {
-	struct config_group	group;
-} uvcg_processing_grp;
+static struct config_group uvcg_processing_grp;
 
 static const struct config_item_type uvcg_processing_grp_type = {
 	.ct_owner = THIS_MODULE,
 };
 
 /* control/terminal/camera/default */
-static struct uvcg_default_camera {
-	struct config_group	group;
-} uvcg_default_camera;
-
-static inline struct uvcg_default_camera
-*to_uvcg_default_camera(struct config_item *item)
-{
-	return container_of(to_config_group(item),
-			    struct uvcg_default_camera, group);
-}
+static struct config_group uvcg_default_camera_grp;
 
 #define UVCG_DEFAULT_CAMERA_ATTR(cname, aname, conv)			\
 static ssize_t uvcg_default_camera_##cname##_show(			\
 	struct config_item *item, char *page)				\
 {									\
-	struct uvcg_default_camera *dc = to_uvcg_default_camera(item);	\
+	struct config_group *group = to_config_group(item);		\
 	struct f_uvc_opts *opts;					\
 	struct config_item *opts_item;					\
-	struct mutex *su_mutex = &dc->group.cg_subsys->su_mutex;	\
+	struct mutex *su_mutex = &group->cg_subsys->su_mutex;		\
 	struct uvc_camera_terminal_descriptor *cd;			\
 	int result;							\
 									\
 	mutex_lock(su_mutex); /* for navigating configfs hierarchy */	\
 									\
-	opts_item = dc->group.cg_item.ci_parent->ci_parent->ci_parent->	\
+	opts_item = group->cg_item.ci_parent->ci_parent->ci_parent->	\
 			ci_parent;					\
 	opts = to_f_uvc_opts(opts_item);				\
 	cd = &opts->uvc_camera_terminal;				\
@@ -343,17 +321,17 @@ UVCG_DEFAULT_CAMERA_ATTR(w_ocular_focal_length, wOcularFocalLength,
 static ssize_t uvcg_default_camera_bm_controls_show(
 	struct config_item *item, char *page)
 {
-	struct uvcg_default_camera *dc = to_uvcg_default_camera(item);
+	struct config_group *group = to_config_group(item);
 	struct f_uvc_opts *opts;
 	struct config_item *opts_item;
-	struct mutex *su_mutex = &dc->group.cg_subsys->su_mutex;
+	struct mutex *su_mutex = &group->cg_subsys->su_mutex;
 	struct uvc_camera_terminal_descriptor *cd;
 	int result, i;
 	char *pg = page;
 
 	mutex_lock(su_mutex); /* for navigating configfs hierarchy */
 
-	opts_item = dc->group.cg_item.ci_parent->ci_parent->ci_parent->
+	opts_item = group->cg_item.ci_parent->ci_parent->ci_parent->
 			ci_parent;
 	opts = to_f_uvc_opts(opts_item);
 	cd = &opts->uvc_camera_terminal;
@@ -391,40 +369,29 @@ static const struct config_item_type uvcg_default_camera_type = {
 /* struct uvcg_camera {}; */
 
 /* control/terminal/camera */
-static struct uvcg_camera_grp {
-	struct config_group	group;
-} uvcg_camera_grp;
+static struct config_group uvcg_camera_grp;
 
 static const struct config_item_type uvcg_camera_grp_type = {
 	.ct_owner = THIS_MODULE,
 };
 
 /* control/terminal/output/default */
-static struct uvcg_default_output {
-	struct config_group	group;
-} uvcg_default_output;
-
-static inline struct uvcg_default_output
-*to_uvcg_default_output(struct config_item *item)
-{
-	return container_of(to_config_group(item),
-			    struct uvcg_default_output, group);
-}
+static struct config_group uvcg_default_output_grp;
 
 #define UVCG_DEFAULT_OUTPUT_ATTR(cname, aname, conv)			\
 static ssize_t uvcg_default_output_##cname##_show(			\
-	struct config_item *item, char *page)			\
+	struct config_item *item, char *page)				\
 {									\
-	struct uvcg_default_output *dout = to_uvcg_default_output(item); \
+	struct config_group *group = to_config_group(item);		\
 	struct f_uvc_opts *opts;					\
 	struct config_item *opts_item;					\
-	struct mutex *su_mutex = &dout->group.cg_subsys->su_mutex;	\
+	struct mutex *su_mutex = &group->cg_subsys->su_mutex;		\
 	struct uvc_output_terminal_descriptor *cd;			\
 	int result;							\
 									\
 	mutex_lock(su_mutex); /* for navigating configfs hierarchy */	\
 									\
-	opts_item = dout->group.cg_item.ci_parent->ci_parent->		\
+	opts_item = group->cg_item.ci_parent->ci_parent->		\
 			ci_parent->ci_parent;				\
 	opts = to_f_uvc_opts(opts_item);				\
 	cd = &opts->uvc_output_terminal;				\
@@ -469,39 +436,32 @@ static const struct config_item_type uvcg_default_output_type = {
 /* struct uvcg_output {}; */
 
 /* control/terminal/output */
-static struct uvcg_output_grp {
-	struct config_group	group;
-} uvcg_output_grp;
+static struct config_group uvcg_output_grp;
 
 static const struct config_item_type uvcg_output_grp_type = {
 	.ct_owner = THIS_MODULE,
 };
 
 /* control/terminal */
-static struct uvcg_terminal_grp {
-	struct config_group	group;
-} uvcg_terminal_grp;
+static struct config_group uvcg_terminal_grp;
 
 static const struct config_item_type uvcg_terminal_grp_type = {
 	.ct_owner = THIS_MODULE,
 };
 
 /* control/class/{fs} */
-static struct uvcg_control_class {
-	struct config_group	group;
-} uvcg_control_class_fs, uvcg_control_class_ss;
-
+static struct config_group uvcg_control_class_fs_grp;
+static struct config_group uvcg_control_class_ss_grp;
 
 static inline struct uvc_descriptor_header
 **uvcg_get_ctl_class_arr(struct config_item *i, struct f_uvc_opts *o)
 {
-	struct uvcg_control_class *cl = container_of(to_config_group(i),
-		struct uvcg_control_class, group);
+	struct config_group *group = to_config_group(i);
 
-	if (cl == &uvcg_control_class_fs)
+	if (group == &uvcg_control_class_fs_grp)
 		return o->uvc_fs_control_cls;
 
-	if (cl == &uvcg_control_class_ss)
+	if (group == &uvcg_control_class_ss_grp)
 		return o->uvc_ss_control_cls;
 
 	return NULL;
@@ -593,36 +553,28 @@ static const struct config_item_type uvcg_control_class_type = {
 };
 
 /* control/class */
-static struct uvcg_control_class_grp {
-	struct config_group	group;
-} uvcg_control_class_grp;
+static struct config_group uvcg_control_class_grp;
 
 static const struct config_item_type uvcg_control_class_grp_type = {
 	.ct_owner = THIS_MODULE,
 };
 
 /* control */
-static struct uvcg_control_grp {
-	struct config_group	group;
-} uvcg_control_grp;
+static struct config_group uvcg_control_grp;
 
 static const struct config_item_type uvcg_control_grp_type = {
 	.ct_owner = THIS_MODULE,
 };
 
 /* streaming/uncompressed */
-static struct uvcg_uncompressed_grp {
-	struct config_group	group;
-} uvcg_uncompressed_grp;
+static struct config_group uvcg_uncompressed_grp;
 
 /* streaming/mjpeg */
-static struct uvcg_mjpeg_grp {
-	struct config_group	group;
-} uvcg_mjpeg_grp;
+static struct config_group uvcg_mjpeg_grp;
 
 static struct config_item *fmt_parent[] = {
-	&uvcg_uncompressed_grp.group.cg_item,
-	&uvcg_mjpeg_grp.group.cg_item,
+	&uvcg_uncompressed_grp.cg_item,
+	&uvcg_mjpeg_grp.cg_item,
 };
 
 enum uvcg_format_type {
@@ -893,9 +845,7 @@ static void uvcg_streaming_header_drop(struct config_group *group,
 }
 
 /* streaming/header */
-static struct uvcg_streaming_header_grp {
-	struct config_group	group;
-} uvcg_streaming_header_grp;
+static struct config_group uvcg_streaming_header_grp;
 
 static struct configfs_group_operations uvcg_streaming_header_grp_ops = {
 	.make_item		= uvcg_streaming_header_make,
@@ -1670,32 +1620,22 @@ static const struct config_item_type uvcg_mjpeg_grp_type = {
 };
 
 /* streaming/color_matching/default */
-static struct uvcg_default_color_matching {
-	struct config_group	group;
-} uvcg_default_color_matching;
-
-static inline struct uvcg_default_color_matching
-*to_uvcg_default_color_matching(struct config_item *item)
-{
-	return container_of(to_config_group(item),
-			    struct uvcg_default_color_matching, group);
-}
+static struct config_group uvcg_default_color_matching_grp;
 
 #define UVCG_DEFAULT_COLOR_MATCHING_ATTR(cname, aname, conv)		\
 static ssize_t uvcg_default_color_matching_##cname##_show(		\
-	struct config_item *item, char *page)		\
+	struct config_item *item, char *page)			\
 {									\
-	struct uvcg_default_color_matching *dc =			\
-		to_uvcg_default_color_matching(item);			\
+	struct config_group *group = to_config_group(item);		\
 	struct f_uvc_opts *opts;					\
 	struct config_item *opts_item;					\
-	struct mutex *su_mutex = &dc->group.cg_subsys->su_mutex;	\
+	struct mutex *su_mutex = &group->cg_subsys->su_mutex;		\
 	struct uvc_color_matching_descriptor *cd;			\
 	int result;							\
 									\
 	mutex_lock(su_mutex); /* for navigating configfs hierarchy */	\
 									\
-	opts_item = dc->group.cg_item.ci_parent->ci_parent->ci_parent;	\
+	opts_item = group->cg_item.ci_parent->ci_parent->ci_parent;	\
 	opts = to_f_uvc_opts(opts_item);				\
 	cd = &opts->uvc_color_matching;					\
 									\
@@ -1737,33 +1677,29 @@ static const struct config_item_type uvcg_default_color_matching_type = {
 /* struct uvcg_color_matching {}; */
 
 /* streaming/color_matching */
-static struct uvcg_color_matching_grp {
-	struct config_group	group;
-} uvcg_color_matching_grp;
+static struct config_group uvcg_color_matching_grp;
 
 static const struct config_item_type uvcg_color_matching_grp_type = {
 	.ct_owner = THIS_MODULE,
 };
 
 /* streaming/class/{fs|hs|ss} */
-static struct uvcg_streaming_class {
-	struct config_group	group;
-} uvcg_streaming_class_fs, uvcg_streaming_class_hs, uvcg_streaming_class_ss;
-
+static struct config_group uvcg_streaming_class_fs_grp;
+static struct config_group uvcg_streaming_class_hs_grp;
+static struct config_group uvcg_streaming_class_ss_grp;
 
 static inline struct uvc_descriptor_header
 ***__uvcg_get_stream_class_arr(struct config_item *i, struct f_uvc_opts *o)
 {
-	struct uvcg_streaming_class *cl = container_of(to_config_group(i),
-		struct uvcg_streaming_class, group);
+	struct config_group *group = to_config_group(i);
 
-	if (cl == &uvcg_streaming_class_fs)
+	if (group == &uvcg_streaming_class_fs_grp)
 		return &o->uvc_fs_streaming_cls;
 
-	if (cl == &uvcg_streaming_class_hs)
+	if (group == &uvcg_streaming_class_hs_grp)
 		return &o->uvc_hs_streaming_cls;
 
-	if (cl == &uvcg_streaming_class_ss)
+	if (group == &uvcg_streaming_class_ss_grp)
 		return &o->uvc_ss_streaming_cls;
 
 	return NULL;
@@ -2092,18 +2028,14 @@ static const struct config_item_type uvcg_streaming_class_type = {
 };
 
 /* streaming/class */
-static struct uvcg_streaming_class_grp {
-	struct config_group	group;
-} uvcg_streaming_class_grp;
+static struct config_group uvcg_streaming_class_grp;
 
 static const struct config_item_type uvcg_streaming_class_grp_type = {
 	.ct_owner = THIS_MODULE,
 };
 
 /* streaming */
-static struct uvcg_streaming_grp {
-	struct config_group	group;
-} uvcg_streaming_grp;
+static struct config_group uvcg_streaming_grp;
 
 static const struct config_item_type uvcg_streaming_grp_type = {
 	.ct_owner = THIS_MODULE,
@@ -2193,114 +2125,114 @@ static const struct config_item_type uvc_func_type = {
 
 int uvcg_attach_configfs(struct f_uvc_opts *opts)
 {
-	config_group_init_type_name(&uvcg_control_header_grp.group,
+	config_group_init_type_name(&uvcg_control_header_grp,
 				    "header",
 				    &uvcg_control_header_grp_type);
 
-	config_group_init_type_name(&uvcg_default_processing.group,
+	config_group_init_type_name(&uvcg_default_processing_grp,
 			"default", &uvcg_default_processing_type);
-	config_group_init_type_name(&uvcg_processing_grp.group,
+	config_group_init_type_name(&uvcg_processing_grp,
 			"processing", &uvcg_processing_grp_type);
-	configfs_add_default_group(&uvcg_default_processing.group,
-			&uvcg_processing_grp.group);
+	configfs_add_default_group(&uvcg_default_processing_grp,
+			&uvcg_processing_grp);
 
-	config_group_init_type_name(&uvcg_default_camera.group,
+	config_group_init_type_name(&uvcg_default_camera_grp,
 			"default", &uvcg_default_camera_type);
-	config_group_init_type_name(&uvcg_camera_grp.group,
+	config_group_init_type_name(&uvcg_camera_grp,
 			"camera", &uvcg_camera_grp_type);
-	configfs_add_default_group(&uvcg_default_camera.group,
-			&uvcg_camera_grp.group);
+	configfs_add_default_group(&uvcg_default_camera_grp,
+			&uvcg_camera_grp);
 
-	config_group_init_type_name(&uvcg_default_output.group,
+	config_group_init_type_name(&uvcg_default_output_grp,
 			"default", &uvcg_default_output_type);
-	config_group_init_type_name(&uvcg_output_grp.group,
+	config_group_init_type_name(&uvcg_output_grp,
 			"output", &uvcg_output_grp_type);
-	configfs_add_default_group(&uvcg_default_output.group,
-			&uvcg_output_grp.group);
+	configfs_add_default_group(&uvcg_default_output_grp,
+			&uvcg_output_grp);
 
-	config_group_init_type_name(&uvcg_terminal_grp.group,
+	config_group_init_type_name(&uvcg_terminal_grp,
 			"terminal", &uvcg_terminal_grp_type);
-	configfs_add_default_group(&uvcg_camera_grp.group,
-			&uvcg_terminal_grp.group);
-	configfs_add_default_group(&uvcg_output_grp.group,
-			&uvcg_terminal_grp.group);
+	configfs_add_default_group(&uvcg_camera_grp,
+			&uvcg_terminal_grp);
+	configfs_add_default_group(&uvcg_output_grp,
+			&uvcg_terminal_grp);
 
-	config_group_init_type_name(&uvcg_control_class_fs.group,
+	config_group_init_type_name(&uvcg_control_class_fs_grp,
 			"fs", &uvcg_control_class_type);
-	config_group_init_type_name(&uvcg_control_class_ss.group,
+	config_group_init_type_name(&uvcg_control_class_ss_grp,
 			"ss", &uvcg_control_class_type);
-	config_group_init_type_name(&uvcg_control_class_grp.group,
+	config_group_init_type_name(&uvcg_control_class_grp,
 			"class",
 			&uvcg_control_class_grp_type);
-	configfs_add_default_group(&uvcg_control_class_fs.group,
-			&uvcg_control_class_grp.group);
-	configfs_add_default_group(&uvcg_control_class_ss.group,
-			&uvcg_control_class_grp.group);
+	configfs_add_default_group(&uvcg_control_class_fs_grp,
+			&uvcg_control_class_grp);
+	configfs_add_default_group(&uvcg_control_class_ss_grp,
+			&uvcg_control_class_grp);
 
-	config_group_init_type_name(&uvcg_control_grp.group,
+	config_group_init_type_name(&uvcg_control_grp,
 			"control",
 			&uvcg_control_grp_type);
-	configfs_add_default_group(&uvcg_control_header_grp.group,
-			&uvcg_control_grp.group);
-	configfs_add_default_group(&uvcg_processing_grp.group,
-			&uvcg_control_grp.group);
-	configfs_add_default_group(&uvcg_terminal_grp.group,
-			&uvcg_control_grp.group);
-	configfs_add_default_group(&uvcg_control_class_grp.group,
-			&uvcg_control_grp.group);
-
-	config_group_init_type_name(&uvcg_streaming_header_grp.group,
+	configfs_add_default_group(&uvcg_control_header_grp,
+			&uvcg_control_grp);
+	configfs_add_default_group(&uvcg_processing_grp,
+			&uvcg_control_grp);
+	configfs_add_default_group(&uvcg_terminal_grp,
+			&uvcg_control_grp);
+	configfs_add_default_group(&uvcg_control_class_grp,
+			&uvcg_control_grp);
+
+	config_group_init_type_name(&uvcg_streaming_header_grp,
 				    "header",
 				    &uvcg_streaming_header_grp_type);
-	config_group_init_type_name(&uvcg_uncompressed_grp.group,
+	config_group_init_type_name(&uvcg_uncompressed_grp,
 				    "uncompressed",
 				    &uvcg_uncompressed_grp_type);
-	config_group_init_type_name(&uvcg_mjpeg_grp.group,
+	config_group_init_type_name(&uvcg_mjpeg_grp,
 				    "mjpeg",
 				    &uvcg_mjpeg_grp_type);
-	config_group_init_type_name(&uvcg_default_color_matching.group,
+	config_group_init_type_name(&uvcg_default_color_matching_grp,
 				    "default",
 				    &uvcg_default_color_matching_type);
-	config_group_init_type_name(&uvcg_color_matching_grp.group,
+	config_group_init_type_name(&uvcg_color_matching_grp,
 			"color_matching",
 			&uvcg_color_matching_grp_type);
-	configfs_add_default_group(&uvcg_default_color_matching.group,
-			&uvcg_color_matching_grp.group);
+	configfs_add_default_group(&uvcg_default_color_matching_grp,
+			&uvcg_color_matching_grp);
 
-	config_group_init_type_name(&uvcg_streaming_class_fs.group,
+	config_group_init_type_name(&uvcg_streaming_class_fs_grp,
 			"fs", &uvcg_streaming_class_type);
-	config_group_init_type_name(&uvcg_streaming_class_hs.group,
+	config_group_init_type_name(&uvcg_streaming_class_hs_grp,
 			"hs", &uvcg_streaming_class_type);
-	config_group_init_type_name(&uvcg_streaming_class_ss.group,
+	config_group_init_type_name(&uvcg_streaming_class_ss_grp,
 			"ss", &uvcg_streaming_class_type);
-	config_group_init_type_name(&uvcg_streaming_class_grp.group,
+	config_group_init_type_name(&uvcg_streaming_class_grp,
 			"class", &uvcg_streaming_class_grp_type);
-	configfs_add_default_group(&uvcg_streaming_class_fs.group,
-			&uvcg_streaming_class_grp.group);
-	configfs_add_default_group(&uvcg_streaming_class_hs.group,
-			&uvcg_streaming_class_grp.group);
-	configfs_add_default_group(&uvcg_streaming_class_ss.group,
-			&uvcg_streaming_class_grp.group);
-
-	config_group_init_type_name(&uvcg_streaming_grp.group,
+	configfs_add_default_group(&uvcg_streaming_class_fs_grp,
+			&uvcg_streaming_class_grp);
+	configfs_add_default_group(&uvcg_streaming_class_hs_grp,
+			&uvcg_streaming_class_grp);
+	configfs_add_default_group(&uvcg_streaming_class_ss_grp,
+			&uvcg_streaming_class_grp);
+
+	config_group_init_type_name(&uvcg_streaming_grp,
 			"streaming", &uvcg_streaming_grp_type);
-	configfs_add_default_group(&uvcg_streaming_header_grp.group,
-			&uvcg_streaming_grp.group);
-	configfs_add_default_group(&uvcg_uncompressed_grp.group,
-			&uvcg_streaming_grp.group);
-	configfs_add_default_group(&uvcg_mjpeg_grp.group,
-			&uvcg_streaming_grp.group);
-	configfs_add_default_group(&uvcg_color_matching_grp.group,
-			&uvcg_streaming_grp.group);
-	configfs_add_default_group(&uvcg_streaming_class_grp.group,
-			&uvcg_streaming_grp.group);
+	configfs_add_default_group(&uvcg_streaming_header_grp,
+			&uvcg_streaming_grp);
+	configfs_add_default_group(&uvcg_uncompressed_grp,
+			&uvcg_streaming_grp);
+	configfs_add_default_group(&uvcg_mjpeg_grp,
+			&uvcg_streaming_grp);
+	configfs_add_default_group(&uvcg_color_matching_grp,
+			&uvcg_streaming_grp);
+	configfs_add_default_group(&uvcg_streaming_class_grp,
+			&uvcg_streaming_grp);
 
 	config_group_init_type_name(&opts->func_inst.group,
 			"",
 			&uvc_func_type);
-	configfs_add_default_group(&uvcg_control_grp.group,
+	configfs_add_default_group(&uvcg_control_grp,
 			&opts->func_inst.group);
-	configfs_add_default_group(&uvcg_streaming_grp.group,
+	configfs_add_default_group(&uvcg_streaming_grp,
 			&opts->func_inst.group);
 
 	return 0;