After calling ioctl to create userptr obj, take aperture lock, check if
there is same userptr obj created after finding object, to catch the
race that multiple threads register same userptr to multiple GPUs.
If same userptr obj exist, then increase userptr registeration_count,
and free the newly create obj.
Change-Id: I63ae3a4f54da8aedd11c124d8d53ebe727b8203a
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
[ROCm/ROCR-Runtime commit: 8f7443494a]
Philip Yang
a6335e1ae2