Return-Path: <cyrus@holtmann.org>
Date: Thu, 26 Jul 2012 17:28:02 +0300
From: Andrei Emeltchenko <Andrei.Emeltchenko.news@gmail.com>
To: Mat Martineau <mathewm@codeaurora.org>
Cc: linux-bluetooth@vger.kernel.org, gustavo@padovan.org,
	pkrystad@codeaurora.org
Subject: Re: [RFCv0 08/21] Bluetooth: Add move channel confirm handling
Message-ID: <20120726142800.GD2686@aemeltch-MOBL1>
References: <1343260274-11953-1-git-send-email-mathewm@codeaurora.org>
 <1343260274-11953-9-git-send-email-mathewm@codeaurora.org>
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In-Reply-To: <1343260274-11953-9-git-send-email-mathewm@codeaurora.org>
Sender: linux-bluetooth-owner@vger.kernel.org
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Hi Mat,

On Wed, Jul 25, 2012 at 04:51:00PM -0700, Mat Martineau wrote:
> Signed-off-by: Mat Martineau <mathewm@codeaurora.org>
> ---
>  net/bluetooth/l2cap_core.c | 71 ++++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 68 insertions(+), 3 deletions(-)
> 
> diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
> index a327f02..b91ad10 100644
> --- a/net/bluetooth/l2cap_core.c
> +++ b/net/bluetooth/l2cap_core.c
> @@ -981,6 +981,9 @@ static void l2cap_move_setup(struct l2cap_chan *chan)
>  
>  	BT_DBG("chan %p", chan);
>  
> +	if (chan->mode != L2CAP_MODE_ERTM)
> +		return;
> +

The chunk above might be added to move_setup patch

>  	__clear_retrans_timer(chan);
>  	__clear_monitor_timer(chan);
>  	__clear_ack_timer(chan);
> @@ -1007,6 +1010,36 @@ 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;
> +
> +	if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
> +		l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
> +		chan->rx_state = L2CAP_RX_STATE_WAIT_F;
> +	} else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {

I think switch might work better here.

> +		chan->rx_state = L2CAP_RX_STATE_WAIT_P;
> +	}
> +}
> +
> +static void l2cap_move_revert(struct l2cap_chan *chan)
> +{
> +	BT_DBG("chan %p", chan);
> +
> +	if (chan->mode != L2CAP_MODE_ERTM)
> +		return;
> +
> +	if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
> +		l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
> +		chan->rx_state = L2CAP_RX_STATE_WAIT_F;
> +	} else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {

and here.

> +		chan->rx_state = L2CAP_RX_STATE_WAIT_P;
> +	}
> +}
> +
>  static void l2cap_chan_ready(struct l2cap_chan *chan)
>  {
>  	/* This clears all conf flags, including CONF_NOT_COMPLETE */
> @@ -4239,11 +4272,12 @@ 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))
> @@ -4254,8 +4288,39 @@ 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->chan_id = chan->move_id;
> +			if (!chan->chan_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->chan_id;
> +			l2cap_move_revert(chan);
> +		}
> +		chan->move_role = L2CAP_MOVE_ROLE_NONE;
> +	} else if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {

and maybe here.

> +		BT_DBG("Bad MOVE_STATE (%d)", chan->move_state);
> +	}
> +
> +
> +send_move_confirm_response:
>  	l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
>  
> +	if (chan)
> +		l2cap_chan_unlock(chan);
> +
>  	return 0;

BTW: Is exit code used somewhere?

Best regards 
Andrei Emeltchenko