From: Luiz Augusto von Dentz luiz.von.dentz@intel.com
[ 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 --- net/bluetooth/l2cap_core.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index 260ef5426e0ca..974c1b8a689c1 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -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; }