drm/prime: drop reference on imported dma-buf come from gem

drm/prime: drop reference on imported dma-buf come from gem

Increasing ref counts of both dma-buf and gem for imported dma-buf come from gem
makes memory leak. release function of dma-buf cannot be called because f_count
of dma-buf increased by importing gem and gem ref count cannot be decrease
because of exported dma-buf.

So I add dma_buf_put() for imported gem come from its own gem into each drivers
having prime_import and prime_export capabilities. With this, only gem ref
count is increased if importing gem exported from gem of same driver.

Signed-off-by: Seung-Woo Kim <[email protected]>
Signed-off-by: Kyungmin.park <[email protected]>
Cc: Inki Dae <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Rob Clark <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>