[media] v4l: vb2-dma-contig: add reference counting for a device from allocator context
This patch adds taking reference to the device for MMAP buffers. Such buffers, may be exported using DMABUF mechanism. If the driver that created a queue is unloaded then the queue is released, the device might be released too. However, buffers cannot be released if they are referenced by DMABUF descriptor(s). The device pointer kept in a buffer must be valid for the whole buffer's lifetime. Therefore MMAP buffers should take a reference to the device to avoid risk of dangling pointers. Signed-off-by: NTomasz Stanislawski <t.stanislaws@samsung.com> Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Tested-by: NMauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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