[PATCH 26/31] Bluetooth: Fix suspending the L2CAP socket if we start with 0 credits

[Johan Hedberg <johan.hedberg@gmail.com>]

From: Johan Hedberg <johan.hedberg@intel.com>

If the peer gives us zero credits in its connection request or response
we must call the suspend channel callback so the BT_SK_SUSPEND flag gets
set and user space is blocked from sending data to the socket.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
---
 net/bluetooth/l2cap_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 0e3a6eac289c..20b8dcf05edd 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -1202,6 +1202,9 @@ static void l2cap_le_flowctl_start(struct l2cap_chan *chan)
 	chan->sdu_len = 0;
 
 	skb_queue_head_init(&chan->tx_q);
+
+	if (!chan->tx_credits)
+		chan->ops->suspend(chan);
 }
 
 static void l2cap_chan_ready(struct l2cap_chan *chan)
-- 
1.8.4.2