USB stack getting confused

[Hans Petter Selasky]

On 3/10/19 11:26 AM, Konstantin Belousov wrote:
> On Sun, Mar 10, 2019 at 11:18:36AM +0100, Hans Petter Selasky wrote:
>> On 3/10/19 10:47 AM, Konstantin Belousov wrote:
>>>> Yes, I can do that if destroy_dev() ensures that d_close is called for
>>>> all open file handles once and only once before it returns. I think this
>>>> is where the problem comes from.
>>> See above.  For d_close it is impossible, for cdevpriv dtr it is already
>>> there by design.
>>>
>>
>> Yes, cdevpriv_dtr will wait for the final close() from user-space
>> unfortunately. Or am I mistaken?
> 
> You are mistaken.  Cdevpriv destructors are called either on the file close
> (not the last close in d_close sense, just file close) OR during destroy_dev().
> Each destructor/file pair is called exactly once, regardless of the cause.
> 

Can you try the attached patch?

--HPS
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