Bluetooth: Add user readable debug for state changes

I did this as a part of a testing course at university, but it might be
useful upstream as well.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

1 files changed, 29 insertions, 0 deletions

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index bdbf919f981c..014fdec17113 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -229,8 +229,37 @@ static void l2cap_clear_timer(struct l2cap_chan *chan, struct timer_list *timer)
                 chan_put(chan);
 }
 
+static char *state_to_string(int state)
+{
+        switch(state) {
+        case BT_CONNECTED:
+                return "BT_CONNECTED";
+        case BT_OPEN:
+                return "BT_OPEN";
+        case BT_BOUND:
+                return "BT_BOUND";
+        case BT_LISTEN:
+                return "BT_LISTEN";
+        case BT_CONNECT:
+                return "BT_CONNECT";
+        case BT_CONNECT2:
+                return "BT_CONNECT2";
+        case BT_CONFIG:
+                return "BT_CONFIG";
+        case BT_DISCONN:
+                return "BT_DISCONN";
+        case BT_CLOSED:
+                return "BT_CLOSED";
+        }
+
+        return "invalid state";
+}
+
 static void l2cap_state_change(struct l2cap_chan *chan, int state)
 {
+        BT_DBG("%p %s -> %s", chan, state_to_string(chan->state),
+                                                state_to_string(state));
+
         chan->state = state;
         chan->ops->state_change(chan->data, state);
 }