Re: [PATCH 4/4] v4l2-mem2mem: allow reqbufs(0) with "in use" MMAP buffers

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Hi,

2015-11-02 19:31 GMT+01:00 Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx>:
> Le mardi 08 avril 2014 à 12:51 +0200, Marek Szyprowski a écrit :
>> Hello,
>>
>> On 2014-04-07 16:41, Kamil Debski wrote:
>> > Pawel, Marek,
>> >
>> > Before taking this to my tree I wanted to get an ACK from one of
>> > the
>> > videobuf2 maintainers. Could you spare a moment to look through
>> > this
>> > patch?
>>
>> It's not a bug, it is a feature. This was one of the fundamental
>> design
>> requirements to allow applications to track if the memory is used or
>> not.
>
> I still have the impression it is not fully correct for the case
> buffers are exported using DMABUF. Like if the dmabuf was owning the
> vb2 buffer instead of the opposite ...

I am observing this behaviour too... Tried it, but seems to not do the
job on dmabuf buffers... with gstreamer at least ;-).

JM
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