My Lenovo Thinkpad X301 locks up consistently when I mount an obexfs
file system over btusb and forget to unmount it before switching off the
other end. There are no messages printed on the console. The box
doesn't have a serial port so I haven't checked with a serial console.
Looking through btusb.c I noticed the quirks for other Thinkpad models
with a Broadcom chip. It just doesn't match the presumably newer chip
in the X301:
T: Bus=03 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 3 Spd=12 MxCh= 0
D: Ver= 2.00 Cls=e0(unk. ) Sub=01 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=0a5c ProdID=2145 Rev= 3.99
S: Manufacturer=Lenovo Computer Corp
S: Product=ThinkPad Bluetooth with Enhanced Data Rate II
C:* #Ifs= 4 Cfg#= 1 Atr=e0 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 3 Cls=e0(unk. ) Sub=01 Prot=01 Driver=btusb
E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=1ms
E: Ad=82(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=btusb
E: Ad=83(I) Atr=01(Isoc) MxPS= 0 Ivl=1ms
E: Ad=03(O) Atr=01(Isoc) MxPS= 0 Ivl=1ms
I: If#= 1 Alt= 1 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=btusb
E: Ad=83(I) Atr=01(Isoc) MxPS= 9 Ivl=1ms
E: Ad=03(O) Atr=01(Isoc) MxPS= 9 Ivl=1ms
I: If#= 1 Alt= 2 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=btusb
E: Ad=83(I) Atr=01(Isoc) MxPS= 17 Ivl=1ms
E: Ad=03(O) Atr=01(Isoc) MxPS= 17 Ivl=1ms
I: If#= 1 Alt= 3 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=btusb
E: Ad=83(I) Atr=01(Isoc) MxPS= 32 Ivl=1ms
E: Ad=03(O) Atr=01(Isoc) MxPS= 32 Ivl=1ms
I: If#= 1 Alt= 4 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=btusb
E: Ad=83(I) Atr=01(Isoc) MxPS= 64 Ivl=1ms
E: Ad=03(O) Atr=01(Isoc) MxPS= 64 Ivl=1ms
I: If#= 1 Alt= 5 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=btusb
E: Ad=83(I) Atr=01(Isoc) MxPS= 64 Ivl=1ms
E: Ad=03(O) Atr=01(Isoc) MxPS= 64 Ivl=1ms
I:* If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E: Ad=84(I) Atr=02(Bulk) MxPS= 32 Ivl=0ms
E: Ad=04(O) Atr=02(Bulk) MxPS= 32 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 0 Cls=fe(app. ) Sub=01 Prot=00 Driver=(none)
This made me try "modprobe btusb force_scofix=1" which seems to fix the
problem. No lock ups observed with this module parameter. hciconfig
reports before and after:
nemi:/tmp# hciconfig
hci0: Type: USB
BD Address: 00:23:4D:F0:D9:1A ACL MTU: 1021:8 SCO MTU: 64:1
UP RUNNING PSCAN
RX bytes:999 acl:0 sco:0 events:31 errors:0
TX bytes:851 acl:0 sco:0 commands:31 errors:0
nemi:/tmp# modprobe -r btusb
nemi:/tmp# modprobe btusb force_scofix=1
nemi:/tmp# hciconfig
hci0: Type: USB
BD Address: 00:23:4D:F0:D9:1A ACL MTU: 1021:8 SCO MTU: 64:8
UP RUNNING PSCAN
RX bytes:999 acl:0 sco:0 events:31 errors:0
TX bytes:851 acl:0 sco:0 commands:31 errors:0
If any of this makes any sense, then I suggest applying the attached
patch to btusb.c.
Signed-off-by: Bjørn Mork <bjorn@xxxxxxx>
---
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index b5fbda6..4355133 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -99,6 +99,7 @@ static struct usb_device_id blacklist_table[] = {
/* IBM/Lenovo ThinkPad with Broadcom chip */
{ USB_DEVICE(0x0a5c, 0x201e), .driver_info = BTUSB_WRONG_SCO_MTU },
{ USB_DEVICE(0x0a5c, 0x2110), .driver_info = BTUSB_WRONG_SCO_MTU },
+ { USB_DEVICE(0x0a5c, 0x2145), .driver_info = BTUSB_WRONG_SCO_MTU },
/* HP laptop with Broadcom chip */
{ USB_DEVICE(0x03f0, 0x171d), .driver_info = BTUSB_WRONG_SCO_MTU },
--
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