Hi Mat,
> After sending a move channel response, a move responder waits for a
> move channel confirm command. If the received command has a
> "confirmed" result the move is proceeding, and "unconfirmed" means the
> move has failed and the channel will not change controllers.
>
> Signed-off-by: Mat Martineau <mathewm@xxxxxxxxxxxxxx>
> ---
> net/bluetooth/l2cap_core.c | 70 ++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 67 insertions(+), 3 deletions(-)
>
> diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
> index 9663292..ed2c23f 100644
> --- a/net/bluetooth/l2cap_core.c
> +++ b/net/bluetooth/l2cap_core.c
> @@ -1036,6 +1036,42 @@ static void l2cap_move_setup(struct l2cap_chan *chan)
> set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
> }
>
> +static void l2cap_move_success(struct l2cap_chan *chan)
> +{
> + BT_DBG("chan %p", chan);
> +
> + if (chan->mode != L2CAP_MODE_ERTM)
> + return;
> +
> + switch (chan->move_role) {
> + case L2CAP_MOVE_ROLE_INITIATOR:
> + l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
> + chan->rx_state = L2CAP_RX_STATE_WAIT_F;
> + break;
> + case L2CAP_MOVE_ROLE_RESPONDER:
> + chan->rx_state = L2CAP_RX_STATE_WAIT_P;
> + break;
> + }
> +}
> +
> +static void l2cap_move_revert(struct l2cap_chan *chan)
> +{
> + BT_DBG("chan %p", chan);
> +
> + if (chan->mode != L2CAP_MODE_ERTM)
> + return;
> +
> + switch (chan->move_role) {
> + case L2CAP_MOVE_ROLE_INITIATOR:
> + l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
> + chan->rx_state = L2CAP_RX_STATE_WAIT_F;
> + break;
> + case L2CAP_MOVE_ROLE_RESPONDER:
> + chan->rx_state = L2CAP_RX_STATE_WAIT_P;
> + break;
> + }
> +}
> +
> static void l2cap_chan_ready(struct l2cap_chan *chan)
> {
> /* This clears all conf flags, including CONF_NOT_COMPLETE */
> @@ -4302,11 +4338,12 @@ static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn,
> return 0;
> }
>
> -static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn,
> - struct l2cap_cmd_hdr *cmd,
> - u16 cmd_len, void *data)
> +static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
> + struct l2cap_cmd_hdr *cmd,
> + u16 cmd_len, void *data)
> {
> struct l2cap_move_chan_cfm *cfm = data;
> + struct l2cap_chan *chan;
> u16 icid, result;
>
> if (cmd_len != sizeof(*cfm))
> @@ -4317,8 +4354,35 @@ static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn,
>
> BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
>
> + chan = l2cap_get_chan_by_dcid(conn, icid);
> + if (!chan)
> + goto send_move_confirm_response;
> +
> + if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
> + chan->move_state = L2CAP_MOVE_STABLE;
> + if (result == L2CAP_MC_CONFIRMED) {
> + chan->local_amp_id = chan->move_id;
> + if (!chan->local_amp_id) {
> + /* Have moved off of AMP, free the channel */
> + chan->hs_hchan = NULL;
> + chan->hs_hcon = NULL;
> +
> + /* Placeholder - free the logical link */
> + }
> + l2cap_move_success(chan);
> + } else {
> + chan->move_id = chan->local_amp_id;
> + l2cap_move_revert(chan);
> + }
> + chan->move_role = L2CAP_MOVE_ROLE_NONE;
> + }
> +
> +send_move_confirm_response:
> l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
>
> + if (chan)
> + l2cap_chan_unlock(chan);
> +
still not a big fan of the if (chan) check before the unlock. This way
of dealing with locks makes my brain hurt ;)
Regards
Marcel
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