Bluetooth: Check earlier for L2CAP ERTM frames to drop

Even when the received tx_seq is expected, the frame still needs to be
dropped if the TX window is exceeded or the receiver is in the local
busy state.

Signed-off-by: Mat Martineau <mathewm@codeaurora.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 27b2cd124f00..bd5d9926bf4f 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -3522,9 +3522,6 @@ static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_cont
         chan->expected_ack_seq = req_seq;
         l2cap_drop_acked_frames(chan);
 
-        if (tx_seq == chan->expected_tx_seq)
-                goto expected;
-
         tx_seq_offset = (tx_seq - chan->buffer_seq) % 64;
         if (tx_seq_offset < 0)
                 tx_seq_offset += 64;
@@ -3538,6 +3535,9 @@ static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_cont
         if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
                 goto drop;
 
+        if (tx_seq == chan->expected_tx_seq)
+                goto expected;
+
         if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
                 struct srej_list *first;