Re: [PATCH] usb-storage: ignore ZTE MF 823 in mode 0x1225

[Lars Melin <larsm17@gmail.com>]

On 2015-07-01 22:41, Matthew Dharm wrote:
> On Wed, Jul 1, 2015 at 8:36 AM, Lars Melin <larsm17@gmail.com> wrote:
>> On 2015-07-01 19:24, Oliver Neukum wrote:
>>>
>>> This device automatically switches itself to another mode (0x1405)
>>> unless the specific access pattern of Windows is followed in its
>>> initial mode. That makes a dirty unmount of the internal storage
>>> devices inevitable if they are mounted. So the devices should
>>> be ignored.
>>>
>> The storage device is a virtual cd-rom drive in the dongles internal
>> flash rom, why do you care if non-writable storage is unmounted dirty?
>>
>> Prohibiting the usb-storage driver to bind makes it impossible for
>> usb_modeswitch to switch the device to one of its other id's..
>
> Lars --
>
> In a separate thread, it was discussed that this device has a SD
> reader in it.  Thus, it's possible to mount the SD card and get it
> dirty and then have it yanked-out from underneath us by this
> unprompted mode switch that the device does.
>

Then I would like to see an lsusb listing for 19d2:1225 with an SD-card 
interface, I have only seen 19d2:1225 with a single storage interface 
which is for the windows install cd-rom.
There are almost no 3G dongles having the SD-card interface active in 
default (non-switched) mode.

/Lars