Re: [PATCH] uvcvideo: Don't call vb2 mmap and get_unmapped_area with queue lock held

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Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> writes:

> Bjørn, does this fix the circular locking dependency you have reported in
> "[v3.19-rc7] possible circular locking dependency in uvc_queue_streamoff" ?
> The report mentions involves locks, so I'm not 100% this patch will fix the
> issue.

Sorry, I forgot all about that report after firing it off...  Should
have followed it up with some more details.

Grepping my logs now I cannot find this warning at all after the one I
reported.  I see it once before (while running 3.19-rc6).  So it is
definitely not easily reproducible.  And I have a bad feeling the
trigger might involve completely unrelated USB issues...

In any case, thanks for the patch.  I will test it for a while and let
you know if the same warning shows ut with it.  But based on the rare
occurence, I don't think I ever will be able to positively confirm that
the warning is gone.


Bjørn
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