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For DMA mapping use-case the page_pool keeps a pointer
to the struct device, which is used in DMA map/unmap calls.
For our in-flight handling, we also need to make sure that
the struct device have not disappeared. This is assured
via using get_device/put_device API.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reported-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>