Re: [PATCH] ar9170usb: add mode-switching for AVM Fritz!WLAN USB N devices in cdrom mode

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On Wed, 2009-11-04 at 20:11 +0100, Oliver Neukum wrote:
> Am Mittwoch, 4. November 2009 19:13:03 schrieb Josua Dietze:
> > There are many devices around now which either "re-expose" the
> > pseudo CDROM or make an additional flash card slot available after
> > being switched. Unfortunately, I have had only one of these on my
> > desk for a while to run tests with it. An USB reset dropped this
> > device (Sony Ericsson MD400) back to default mode right away, driver
> > partition freshly connected and SD slot gone.
> 
> This has a tendency for an ugly cycle.
> 
> Defective SD card -> error handler resets -> reader disconnected
> -> udev switches mode -> SD reader scanned -> defective SD card -> ...
> 
> I think we need a quirk for such devices. I think it is cleaner to have
> it add usbcore's level as we cannot be sure this is always limited
> to the storage driver. Comments?

I have a few devices (Sierra Compass 881 (USBConnect Mercury), Huawei
E160G, ZTE MF626, Huawei E168C, Option iCON 402) that all have storage
capability that I'm happy to send lsusb dumps for or behavior
observations.  I only have one MicroSD card though, so I don't think I'd
be willing to hit it with a hammer to make it defective :)

Dan


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