Return-Path: From: Wolfgang Walter To: bluez-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: patch: problem with sco Date: Thu, 12 Jan 2006 01:38:31 +0100 Cc: marcel@holtmann.org, maxk@qualcomm.com MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Message-Id: <200601120138.31791.wolfgang.walter@studentenwerk.mhn.de> List-ID: 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 M?nchen Anstalt des ?ffentlichen Rechts Leiter EDV Leopoldstra?e 15 80802 M?nchen Tel: +49 89 38196-276 Fax: +49 89 38196-144 wolfgang.walter@studentenwerk.mhn.de http://www.studentenwerk.mhn.de/