skel_buffer
struct skel_buffer *buf = to_skel_buffer(vbuf);
struct skel_buffer *buf, *node;
static inline struct skel_buffer *to_skel_buffer(struct vb2_v4l2_buffer *vbuf)
return container_of(vbuf, struct skel_buffer, vb);
q->buf_struct_size = sizeof(struct skel_buffer);