Bluetooth: Process receiving FCS_NONE in L2CAP Conf Rsp

Process L2CAP Config rsp Pending with FCS Option 0x00 (No FCS)
which is sent by Motorola Windows 7 Bluetooth stack. The trace
is shown below (all other options are skipped).

...
< ACL data: handle 1 flags 0x00 dlen 48
    L2CAP(s): Config req: dcid 0x0043 flags 0x00 clen 36
      ...
      FCS Option 0x00 (No FCS)
> ACL data: handle 1 flags 0x02 dlen 48
    L2CAP(s): Config req: dcid 0x0041 flags 0x00 clen 36
      ...
      FCS Option 0x01 (CRC16 Check)
< ACL data: handle 1 flags 0x00 dlen 47
    L2CAP(s): Config rsp: scid 0x0043 flags 0x00 result 4 clen 33
      Pending
      ...
> ACL data: handle 1 flags 0x02 dlen 50
    L2CAP(s): Config rsp: scid 0x0041 flags 0x00 result 4 clen 36
      Pending
      ...
      FCS Option 0x00 (No FCS)
< ACL data: handle 1 flags 0x00 dlen 14
    L2CAP(s): Config rsp: scid 0x0043 flags 0x00 result 0 clen 0
      Success
> ACL data: handle 1 flags 0x02 dlen 14
    L2CAP(s): Config rsp: scid 0x0041 flags 0x00 result 0 clen 0
      Success
...

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
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 d22d183..8c43277 100644 (file)
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -3431,6 +3431,13 @@ static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
                        l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
                                           (unsigned long) &efs);
                        break;
+
+               case L2CAP_CONF_FCS:
+                       if (*result == L2CAP_CONF_PENDING)
+                               if (val == L2CAP_FCS_NONE)
+                                       set_bit(CONF_NO_FCS_RECV,
+                                               &chan->conf_state);
+                       break;
                }
        }