linux-kernel - Re: [PATCH v2] usb: dwc3: Prevent indefinite sleep in _dwc3_set

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Message-ID: <87r2nnldq6.fsf@linux.intel.com>
Date:   Tue, 10 Apr 2018 10:31:13 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        Roger Quadros <rogerq@...com>
Cc:     "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] usb: dwc3: Prevent indefinite sleep in _dwc3_set_mode during suspend/resume


Hi,

Minas Harutyunyan <Minas.Harutyunyan@...opsys.com> writes:
>>>>>>> Actually to fix this issue I updated condition of wait function
>>>>>>> from:
>>>>>>> !(dep->flags & DWC3_EP_END_TRANSFER_PENDING)
>>>>>>> to:
>>>>>>> !(dep->flags & DWC3_EP_END_TRANSFER_PENDING & DWC3_EP_ENABLED)
>>>>>>
>>>>>> you're not fixing anything. You're, essentially, removing the entire
>>>>>> end transfer pending logic.
>>>>> yes, you are right, but how to overcome this infinite loop? Replace
>>>>> wait_event_lock_irq() by  wait_event_interruptible_lock_irq_timeout()?
>>>>
>>>> The best way here would be to figure why we're missing command complete
>>>> IRQ in those cases. According to documentation, we *should* receive that
>>>> interrupt, so why is it missing?
>>>>
>>>
>>> Additional info on test. Core configuration is HS only mode, test speed
>>> HS, core version v2.90a. Maybe it will help to understand cause of issue.
>>> BTW, currently to pass above describe ISOC OUT test we just commented
>>> wait_event_lock_irq() in dwc3_gadget_ep_dequeue() function and
>>> successfully received request completion in function driver.
>>> Thanks,
>>> Minas
>>>
>> 
>> One more info: while function driver call dequeue, host periodically
>> send control read command to get status of test from function - test In
>> Progress or Finished.
>> Thanks,
>> Minas
>> 
>
> Your last dwc3 patch series allow us to successfully dequeuing remaining 
> requests without falling in to infinite loop.

that's cool, thanks :-) I'll just fix the documentation bug I introduced
heh :-)

-- 
balbi

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