I reverted 823bd3433424aa959499e6fd8f2da842430a8d42 and recompiled cdc_ether module for debian's 4.4rc6.
Device begin working normally as usual, no any Oopses or problems.
Attaching lsusb output for this kernel.
Note that this device uses usb mode switching: initially it appears as 1076:8001 storage with drivers, and then is swithced to actual networking device 1076:8002.
I\m attaching lsusb -v output for both modes.
> On Thu, 2015-12-31 at 07:22 +0300, Vasily Galkin wrote:
>
>> After switching from 4.3 to 4.4rc-s plugging device ID 1076:8002 GCT Semiconductor, Inc. LU150 LTE Modem [Yota LU150] causes kernel Oops.
>>
>> The Oops is always reproducible when this device is plugged or system is booted with it.
>> Oops reproduced with debian's 4.4.rc6 and vanilla 4.4rcs (http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-rc1+cod1-wily/, tryied without nvidia blob)
>> After the oops system is semioperable - for example lsusb and rebooting hangs.
>>
>> With debian's 4.3.0 and vanilla 4.3.3 (http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3.3-wily/) all works neraly fine - device never causes Oops but rarely silently doesn't work showing that cdc_ether driver is in use instead of typical rndis_host.
>>
>> Here is the most interesting parts of Oops, full in attahced dmesg
>
> Please try reverting 823bd3433424aa959499e6fd8f2da842430a8d42
> and provide lsusb -v of your device.
>
> Regards
> Oliver
Bus 002 Device 011: ID 1076:8002 GCT Semiconductor, Inc. LU150 LTE Modem [Yota LU150]
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x1076 GCT Semiconductor, Inc.
idProduct 0x8002 LU150 LTE Modem [Yota LU150]
bcdDevice 1.00
iManufacturer 1 GCT SEMICONDUCTOR Inc
iProduct 2 Modem Yota
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 62
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 224 Wireless
bInterfaceSubClass 1 Radio Frequency
bInterfaceProtocol 3 RNDIS
iInterface 0
** UNRECOGNIZED: 05 24 01 00 01
** UNRECOGNIZED: 04 24 02 00
** UNRECOGNIZED: 05 24 02 00 01
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 4
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
Bus 002 Device 010: ID 1076:8001 GCT Semiconductor, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x1076 GCT Semiconductor, Inc.
idProduct 0x8001
bcdDevice 1.00
iManufacturer 1 GCT SEMICONDUCTOR Inc
iProduct 2 Modem Yota
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk-Only
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
