Commit 245b2765 authored Sep 04, 2018 by Luiz Augusto von Dentz Committed by Greg Kroah-Hartman Nov 20, 2019

Bluetooth: L2CAP: Detect if remote is not able to use the whole MPS



[ Upstream commit a5c3021bb62b970713550db3f7fd08aa70665d7e ]

If the remote is not able to fully utilize the MPS choosen recalculate
the credits based on the actual amount it is sending that way it can
still send packets of MTU size without credits dropping to 0.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent 2c894646

net/bluetooth/l2cap_core.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -6819,6 +6819,16 @@ static int l2cap_le_data_rcv(struct l2cap_chan chan, struct sk_buff skb)
		chan->sdu_len = sdu_len;
		chan->sdu_last_frag = skb;

		/* Detect if remote is not able to use the selected MPS */
		if (skb->len + L2CAP_SDULEN_SIZE < chan->mps) {
		u16 mps_len = skb->len + L2CAP_SDULEN_SIZE;

		/* Adjust the number of credits */
		BT_DBG("chan->mps %u -> %u", chan->mps, mps_len);
		chan->mps = mps_len;
		l2cap_chan_le_send_credits(chan);
		}

		return 0;
		}