Hi Mat,
> This fixes a bug which caused the FCS setting to show L2CAP_FCS_CRC16
> with L2CAP modes other than ERTM or streaming. At present, this only
> affects the FCS value shown with getsockopt() for basic mode.
>
> Signed-off-by: Mat Martineau <[email protected]>
> ---
> net/bluetooth/l2cap.c | 16 ++++++++++++----
> 1 files changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
> index 3e3cd9d..bc10be8 100644
> --- a/net/bluetooth/l2cap.c
> +++ b/net/bluetooth/l2cap.c
> @@ -3072,6 +3072,16 @@ static inline int l2cap_connect_rsp(struct l2cap_conn
> *conn, struct l2cap_cmd_hd
> return 0;
> }
>
> +static inline int l2cap_fcs_needed(struct l2cap_pinfo *pi)
> +{
> + if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING)
> + return 0;
> +
> + /* FCS is enabled if one or both sides request it. */
> + return !(pi->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
> + pi->fcs == L2CAP_FCS_CRC16;
> +}
so I think a switch statement is easier to read:
switch (pi->mode) {
case L2CAP_MODE_ERTM:
case L2CAP_MODE_STREAMING:
return !(pi->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
pi->fcs == L2CAP_FCS_CRC16;
}
return 0;
> static inline int l2cap_config_req(struct l2cap_conn *conn, struct
> l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
> {
> struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
> @@ -3136,8 +3146,7 @@ static inline int l2cap_config_req(struct l2cap_conn
> *conn, struct l2cap_cmd_hdr
> goto unlock;
>
> if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
> - if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
> - l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
> + if (l2cap_fcs_needed(l2cap_pi(sk)))
> l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
While this is just fine, I think we might should make this a lot
simpler:
if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
set_default_fcs(pi);
...
}
With then set_default_fcs() doing all the checks etc. and setting either
FCS_NONE or FCS_CRC16.
Would this work or do we have to deal with some funny default behavior?
Regards
Marcel
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