On Tuesday 31 July 2012 16:54:13 Bjørn Mork wrote:
> Alan Stern <st...@rowland.harvard.edu> writes:
> > On Tue, 31 Jul 2012, Bjørn Mork wrote:
> >
> >> IMHO that should have been the default for any composite device, but
> >> whatever.. I don't think it's very nice of usb-storage to reset the
> >> device if there are drivers bound to other functions.
> >
> > That's why we have pre_reset and post_reset callbacks. The alternative
> > is to lose access to all the mounted filesystems on the mass-storage
> > device, which isn't very nice either.
>
> Well, you are then saying that usb-storage has priority over any other
> function and that is often wrong IMHO. There are many newer composite
> devices where the usb-storage function is thrown in as a bonus most
> users never will touch, where the main function can be modem or printer
> or whatever. Letting the usb-storage driver reset these devices is bad.
>
> Ref for example http://comments.gmane.org/gmane.linux.usb.general/60055
User space can set the quirk. It wasn't intended for this, but it does the
job. Furthermore on such devices, storage could be a bot more cooperative
and try the class specific reset first.
Regards
Oliver
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