Re: USB gadgets with configfs hang reboot

[Ivaylo Dimitrov <ivo.g.dimitrov.75-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On  8.04.2016 23:13, Ivaylo Dimitrov wrote:
> Hi,
>
> On 16.01.2016 12:40, Ivaylo Dimitrov wrote:
>> Hi,
>>
>> On 16.01.2016 00:48, Tony Lindgren wrote:
>>> Hi all,
>>>
>>> Looks like there's some issue with the USB gadgets and configfs.
>>>
...
>
> (copied from "Re: [PATCH] usb: f_mass_storage: test whether thread is
> running before starting another" thread)
>
> Yet another problem with USB gadget, this time with f_acm - if there is
> an open /dev/ttyGSn device, it is impossible to reboot/power down the
> device.
>
> My investigation shown that there is a process(pnatd) that opens
> /dev/ttyGSn devices, so gserial_free_port() hangs on
> wait_event(port->close_wait, gs_closed(port)); if I do "cd
> /sys/bus/platform/drivers/musb-hdrc && echo musb-hdrc.0.auto > unbind".
>
> Unfortunately I don't have serial debug port connector on my N900, so I
> can't capture logs after the reboot command, however, I suspect it hangs
> on the same place as with unbind.
>
> That looks weird, as one would expect that close() is called when the
> kernel kills user processes on reboot/powerdown.
>
> Ivo


Anyone?
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