Two cdc-wdm from two Sierra Wireless cards on same wwan

[quentin.dore at orange.com]

Hello,

I have sometimes an issue during the association cdc-wdm/wwan.

I work with kernel 4.1.10, Debian 7.9 and two Sierra Wireless cards MC7304.
Firmware for sierra cards is : SWI9X15C_05.05.58.00 r27038 carmd-fwbuild1 2015/03/04 21:30:23.

MC7304 are configured to expose only one cdc-wdm interface (but the issue is also seen with configuration 7 and two cdc-wdm for each card) :

AT!UDUSBCOMP?
!UDUSBCOMP: 6
AT!UDUSBCOMP=?
...
6             - DM      NMEA   AT          QMI                                                                                     SUPPORTED
7             - DM      NMEA   AT          RMNET1              RMNET2              RMNET3              SUPPORTED
...

During boot, the second card is linked to wwan0 instead of wwan1 :

[    4.438764] usb 1-1.4.2: new high-speed USB device number 6 using ehci-pci
[    4.533405] usb 1-1.4.2: config 1 has an invalid interface number: 8 but max is 3
[    4.533413] usb 1-1.4.2: config 1 has no interface number 1
[    4.534973] usb 1-1.4.2: New USB device found, idVendor=1199, idProduct=68c0
[    4.534981] usb 1-1.4.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    4.534986] usb 1-1.4.2: Product: MC7304
[    4.534991] usb 1-1.4.2: Manufacturer: Sierra Wireless, Incorporated
[    4.549452] usbcore: registered new interface driver usbserial
[    4.549484] usbcore: registered new interface driver usbserial_generic
[    4.549540] usbserial: USB Serial support registered for generic
[    4.556272] usbcore: registered new interface driver option
[    4.556624] usbserial: USB Serial support registered for GSM modem (1-port)
[    4.557058] option 1-1.4.2:1.0: GSM modem (1-port) converter detected
[    4.557605] usb 1-1.4.2: GSM modem (1-port) converter now attached to ttyUSB0
[    4.557687] option 1-1.4.2:1.2: GSM modem (1-port) converter detected
[    4.558070] usb 1-1.4.2: GSM modem (1-port) converter now attached to ttyUSB1
[    4.558423] option 1-1.4.2:1.3: GSM modem (1-port) converter detected
[    4.559119] usb 1-1.4.2: GSM modem (1-port) converter now attached to ttyUSB2
[    4.577940] usbcore: registered new interface driver cdc_wdm
[    4.583464] qmi_wwan 1-1.4.2:1.8: cdc-wdm0: USB WDM device
[    4.583971] qmi_wwan 1-1.4.2:1.8 wwan0: register 'qmi_wwan' at usb-0000:00:1d.0-1.4.2, WWAN/QMI device, d2:8d:ab:fb:d6:15
[    4.584372] usbcore: registered new interface driver qmi_wwan
[    9.858728] usb 1-1.4.4: new high-speed USB device number 8 using ehci-pci
[    9.951664] usb 1-1.4.4: config 1 has an invalid interface number: 8 but max is 3
[    9.951676] usb 1-1.4.4: config 1 has no interface number 1
[    9.952401] usb 1-1.4.4: New USB device found, idVendor=1199, idProduct=68c0
[    9.952412] usb 1-1.4.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    9.952420] usb 1-1.4.4: Product: MC7304
[    9.952427] usb 1-1.4.4: Manufacturer: Sierra Wireless, Incorporated
[    9.953521] option 1-1.4.4:1.0: GSM modem (1-port) converter detected
[    9.953791] usb 1-1.4.4: GSM modem (1-port) converter now attached to ttyUSB3
[    9.954114] option 1-1.4.4:1.2: GSM modem (1-port) converter detected
[    9.954382] usb 1-1.4.4: GSM modem (1-port) converter now attached to ttyUSB4
[    9.954751] option 1-1.4.4:1.3: GSM modem (1-port) converter detected
[    9.955121] usb 1-1.4.4: GSM modem (1-port) converter now attached to ttyUSB5
[    9.955902] qmi_wwan 1-1.4.4:1.8: cdc-wdm1: USB WDM device
[    9.956448] qmi_wwan 1-1.4.4:1.8 wwan0: register 'qmi_wwan' at usb-0000:00:1d.0-1.4.4, WWAN/QMI device, d2:8d:ab:fb:d6:15

More information:

ls -l /sys/class/net/wwan*
lrwxrwxrwx 1 root root 0 mai   10 11:18 /sys/class/net/wwan0 -> ../../devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4/1-1.4.4/1-1.4.4:1.8/net/wwan0

ls -l /sys/class/usbmisc/cdc-wdm*
lrwxrwxrwx 1 root root 0 mai   10 11:18 /sys/class/usbmisc/cdc-wdm0 -> ../../devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4/1-1.4.2/1-1.4.2:1.8/usbmisc/cdc-wdm0
lrwxrwxrwx 1 root root 0 mai   10 11:18 /sys/class/usbmisc/cdc-wdm1 -> ../../devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.4/1-1.4.4/1-1.4.4:1.8/usbmisc/cdc-wdm1

I really have no idea what the problem is.
Another information : this is only seen when SIM cards and antennas (for both MC7304) are inserted and plugged.

Thanks for your help.

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