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>

1 files changed, 7 insertions, 3 deletions

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 3c5ae0e4c56..293b78a6c64 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);
 }