dma-buf: Add debugfs support
Add debugfs support to make it easier to print debug information
about the dma-buf buffers.
Cc: Dave Airlie <airlied@redhat.com>
[minor fixes on init and warning fix]
Cc: Dan Carpenter <dan.carpenter@oracle.com>
[remove double unlock in fail case]
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
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