vb2_core_querybuf
EXPORT_SYMBOL_GPL(vb2_core_querybuf);
vb2_core_querybuf(q, vb, b);
vb2_core_querybuf(&ctx->vb_q, vb2, b);
void vb2_core_querybuf(struct vb2_queue *q, struct vb2_buffer *vb, void *pb);