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open nvvse node only once during vse operation, if another thread try to open then return error. Bug 4075005 Change-Id: Iea88799bf761442cecc8e6336e9743e0fe7cd6e2 Signed-off-by: Manish Bhardwaj <mbhardwaj@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2891721 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Reviewed-by: Advaya Andhare <aandhare@nvidia.com> Reviewed-by: Sandeep Trasi <strasi@nvidia.com> Reviewed-by: svcacv <svcacv@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>