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

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Date:   Fri, 16 Mar 2018 13:03:12 +0200
From:   Roger Quadros <rogerq@...com>
To:     Felipe Balbi <balbi@...nel.org>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] usb: dwc3: Prevent indefinite sleep in _dwc3_set_mode
 during suspend/resume

On 16/03/18 13:00, Felipe Balbi wrote:
> 
> Hi,
> 
> Roger Quadros <rogerq@...com> writes:
> 
>> Hi Felipe,
>>
>> On 09/03/18 14:47, Roger Quadros wrote:
>>> In the following test we get stuck by sleeping forever in _dwc3_set_mode()
>>> after which dual-role switching doesn't work.
>>>
>>> On dra7-evm's dual-role port,
>>> - Load g_zero gadget driver and enumerate to host
>>> - suspend to mem
>>> - disconnect USB cable to host and connect otg cable with Pen drive in it.
>>> - resume system
>>> - we sleep indefinitely in _dwc3_set_mode due to.
>>>   dwc3_gadget_exit()->usb_del_gadget_udc()->udc_stop()->
>>> 	dwc3_gadget_stop()->wait_event_lock_irq()
>>>
>>> To fix this instead of waiting indefinitely with wait_event_lock_irq()
>>> we use wait_event_interruptible_lock_irq_timeout() and print
>>> and error message if there was a timeout.
>>>
>>> Signed-off-by: Roger Quadros <rogerq@...com>
>>
>> Thanks for picking this for -next.
>> Is it better to have this in v4.16-rc fixes?
>> and also stable? v4.12+
> 
> Well, there was no "Fixes: foobar" or "Cc: stable" lines in the commit
> log ;-)
> 
> The best we can do now, is wait for -rc1 and manually send the commit to
> stable.
> 

That's fine. Thanks.

-- 
cheers,
-roger

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