[PATCH] usb/fsl_udc: fix dequeuing a request in progress

[Peter Chen]

On Tue, Nov 22, 2011 at 7:48 PM, Peter Chen <hzpeterchen at gmail.com> wrote:
>>>It seems to can't get the correct qh pointer, you may still need to use
>>>below code to get it
>>>       int i = ep_index(ep) * 2 + ep_is_in(ep);
>>>       struct ep_queue_head *dQH = &ep->udc->ep_qh[i];
>>
>> Thanks for trying.    It will be much easier if we can dereference QH from the ep structure.  It is really strange that the ep->qh pointer is not working somehow.
>>
>
> Seems only ep0-out's qh pointer is assigned at ep structure.
> At probe:
> /* setup udc->eps[] for ep0 */
> struct_ep_setup(udc_controller, 0, "ep0", 0);
>
>
>> We have initialized it in struct_ep_setup():
>>        ep->qh = &udc->ep_qh[index];
>>
>> Can you do me a favor on investigating why it's failing?
>>
Leo, I have debugged this issue at my board just now, the reason of failure
is we only have one ep struct for ep0, so when talking about ep0, it always
pointers to udc->ep[0]. So even we initialize the current qh address for ep0in
at probe, it still can't get the ep0in's qh address through ep
structure, as ep0 is
always udc->ep[0].

>> Thanks,
>> Leo
>>
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>
>
>
> --
> BR,
> Peter Chen
>



-- 
BR,
Peter Chen