rfcomm_frame_hdr
mtu = s->mtu + sizeof(struct rfcomm_frame_hdr) + 1 + 1;
sizeof(struct rfcomm_frame_hdr) - 1 - 1;
sizeof(struct rfcomm_frame_hdr) - 1 - 1;
struct rfcomm_frame_hdr *hdr = NULL;
hdr = mtod(m0, struct rfcomm_frame_hdr *);
struct rfcomm_frame_hdr *hdr = NULL;
hdr = mtod(m, struct rfcomm_frame_hdr *);