From: Mat Martineau <mathewm@codeaurora.org>
Date: Fri, 18 May 2012 03:53:51 +0000 (-0700)
Subject: Bluetooth: Simplify the ERTM ack timeout
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0362520bf9d35f09c2693e14352f4b0ad07397fa;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

Bluetooth: Simplify the ERTM ack timeout

Since l2cap_send_ack can trigger extra actions like sending iframes,
don't call it.  Just send an RR or RNR frame if an ack needs sending.

Signed-off-by: Mat Martineau <mathewm@codeaurora.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
---

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 3c5ae0e4c569..293b78a6c644 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -2761,16 +2761,20 @@ static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
 static void l2cap_ack_timeout(struct work_struct *work)
 {
 	struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
-							ack_timer.work);
+					       ack_timer.work);
+	u16 frames_to_ack;
 
 	BT_DBG("chan %p", chan);
 
 	l2cap_chan_lock(chan);
 
-	l2cap_send_ack(chan);
+	frames_to_ack = __seq_offset(chan, chan->buffer_seq,
+				     chan->last_acked_seq);
 
-	l2cap_chan_unlock(chan);
+	if (frames_to_ack)
+		l2cap_send_rr_or_rnr(chan, 0);
 
+	l2cap_chan_unlock(chan);
 	l2cap_chan_put(chan);
 }