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Bluetooth: Get a more accurate L2CAP PDU len

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Both FCS and Extended header might be or might not be present in a ERTM
channel.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Reviewed-by: Mat Martineau <mathewm@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Gustavo Padovan 2012-05-25 18:57:05 -03:00 committed by Johan Hedberg
parent 523e93cdb3
commit 35d401df3d
1 changed files with 7 additions and 1 deletions
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8
net/bluetooth/l2cap_core.c
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@ -2130,7 +2130,13 @@ static int l2cap_segment_sdu(struct l2cap_chan *chan,
pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
/* Adjust for largest possible L2CAP overhead. */
pdu_len -= L2CAP_EXT_HDR_SIZE + L2CAP_FCS_SIZE;
if (chan->fcs)
pdu_len -= L2CAP_FCS_SIZE;
if (test_bit(FLAG_EXT_CTRL, &chan->flags))
pdu_len -= L2CAP_EXT_HDR_SIZE;
else
pdu_len -= L2CAP_ENH_HDR_SIZE;
/* Remote device may have requested smaller PDUs */
pdu_len = min_t(size_t, pdu_len, chan->remote_mps);