From a5c3021bb62b970713550db3f7fd08aa70665d7e Mon Sep 17 00:00:00 2001
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date: Tue, 4 Sep 2018 13:39:22 +0300
Subject: [PATCH] Bluetooth: L2CAP: Detect if remote is not able to use the whole MPS
Git-commit: a5c3021bb62b970713550db3f7fd08aa70665d7e
Patch-mainline: v4.20-rc1
References: bsc#1051510
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 3fb2d757df88..514899f7f0d4 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -6787,6 +6787,16 @@ 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;
}
--
2.16.4