Re: usb_set_intfdata usage for two subdrivers

[Antti Palosaari <crope@iki.fi>]

On 08/29/2011 03:36 AM, Greg KH wrote:
> On Mon, Aug 29, 2011 at 02:30:26AM +0300, Antti Palosaari wrote:
>> I am trying to implement DVB USB device smartcard reader support
>> using USB-serial.
>
> Really?  Why?  That doesn't seem to make sense, please explain more.

Since it is old style serial smartcard reader, not CCID PC/SC as new 
readers. I see it a little bit overkill to register virtual HCI and 
virtual CCID device though it sounds interesting.

There is already one such similar driver, iuu_phoenix, but without DVB 
support ;) Consider situation I have iuu_phoenix integrated to USB DVB 
device. Both using same USB enpoint, sharing hardware resources of 
communication.

>> The main problem is now that both DVB-USB and
>> USB-serial uses interface data (usb_set_intfdata / usb_get_intfdata)
>> for state.
>>
>> Is there any common solution to resolve issue easily?
>
> No two drivers can bind to the same USB interface, so of course they
> would interfere.
>
> Care to explain the problem in more detail to see if there is a better
> way to do all of this?
>
> greg k-h


regards
Antti

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