A friend and I encountered a problem with sco transfers to a headset using
linux (vanilla 2.6.15). While all sco packets sent by the headset were
received there was no outgoing traffic.
After switching debugging output on we found that actually sco_cnt was always
zero in hci_sched_sco.
hciconfig hci0 shows sco_mtu to be 64:0. Changing that to 64:8 did not help.
This was because in hci_cc_info_param hdev->sco_pkts is set to zero. When we
changed this line so that hdev->sco_pkts is set to 8 if bs->sco_max_pkt is 0
sco transfer to the headset started to work just fine.
Here the patch:
--- linux-2.6.15/net/bluetooth/hci_event.c 2006-01-03 04:21:10.000000000 +0100
+++ linux-2.6.15-dbg/net/bluetooth/hci_event.c 2006-01-12 00:35:48.000000000 +0100
@@ -322,7 +322,7 @@
hdev->acl_mtu = __le16_to_cpu(bs->acl_mtu);
hdev->sco_mtu = bs->sco_mtu ? bs->sco_mtu : 64;
hdev->acl_pkts = hdev->acl_cnt = __le16_to_cpu(bs->acl_max_pkt);
- hdev->sco_pkts = hdev->sco_cnt = __le16_to_cpu(bs->sco_max_pkt);
+ hdev->sco_pkts = hdev->sco_cnt = (bs->sco_max_pkt ? __le16_to_cpu(bs->sco_max_pkt) : 8);
BT_DBG("%s mtu: acl %d, sco %d max_pkt: acl %d, sco %d", hdev->name,
hdev->acl_mtu, hdev->sco_mtu, hdev->acl_pkts, hdev->sco_pkts);
--
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
Leiter EDV
Leopoldstraße 15
80802 München
Tel: +49 89 38196-276
Fax: +49 89 38196-144
[email protected]
http://www.studentenwerk.mhn.de/
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