On 2015-03-24 18:26, Sami Farin wrote:
On Tue, Mar 24, 2015 at 18:02:51 +0700, Lars Melin wrote:
On 2015-03-24 17:20, Oliver Neukum wrote:
...
[ 2777.325282] scsi host37: usb-storage 2-1.4.4:1.0
[ 2777.903039] usb 2-1.4.4: usbfs: interface 0 claimed by usb-storage
while 'usb_modeswitch' sets config #2
This fails. It comes from proc_setconfig(). It suggests that a change
in storage causes this. To verify, could you blacklist usb-storage
in a test with 4.0?
Regards
Oliver
12d1:157d has 2 configurations, config #1 being the virtual cd-rom
containing windows drivers and config #2 containing cdc_mbim interfaces.
cdc_mbim is the primary protocol for this Win8 approved dongle but it can be
switched via a bulkmsg into an "old Win" compatibility mode which
usually is cdc_ether.
4.0.0-rc5+ does not switch to "old Win" mode even if I blacklist usb_storage,
have to reboot to 3.18.9.
Why?
[57023.245141] usb 5-1: USB disconnect, device number 3
[57036.756071] usb 5-1: new high-speed USB device number 4 using xhci_hcd
[57036.926823] usb 5-1: New USB device found, idVendor=12d1, idProduct=157d
[57036.926827] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[57036.926828] usb 5-1: Product: HUAWEI_MOBILE
[57036.926829] usb 5-1: Manufacturer: HUAWEI_MOBILE
[57036.926831] usb 5-1: SerialNumber: 0123456789ABCDEF
usb_modeswitch will check if the cdc_mbim driver is present in the system
when it finds a dongle which has cdc_mbim attributes on its interfaces.
If the driver is found then the port will be set to config #2 which is the
required config number for cdc_mbim.
If no driver is found then the bulk msg will be sent for switching the
dongle into compatibility mode where it also will have a different usb id.
Blacklisting usb_storage will not change the behavior of usb_modeswitch.
Your dongle has cdc_mbim interfaces and you have the cdc_mbim driver in
4.0.0-rc5 so usb_modeswitch will select config #2.
If you remove the cdc_mbim driver from your system then you will get a
traditional mode switch into cdc_ether compatibility mode.
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
