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- add support to unmap the previously mapped memory - updated the data structure to store the dma pointer in user space - taking dma buf pointer from user space while unmapping JIRA SS-4006 JIRA SS-4628 Bug 3855033 Change-Id: I8ca71d11076b64af33c32e6e30c7c056828fbf75 Signed-off-by: Rahul Bedarkar <rabedarkar@nvidia.com> Signed-off-by: Prashant Kumar Shaw <pshaw@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2819744 Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>