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- The pmu_pg_task thread remains alive in the background during railgate and rail-ungate. - During rail-ungate, the PG task thread starts again and executes PG-related tasks. - It comes in pmu_pg_init_powergating() and waits for GR initialization. Here it waits for gr to be initialized. - In parallel, the main GPU thread works on rmmod (from gpu_module_reload test). - By this time, the main gpu thread has started rmmod and gr->initialized can be set to false, thus causing an uninterruptible wait for pmu_pg_task thread. - To solve this, wake gr wait wq in rmmod path when NVGPU_DRIVER_IS_DYING and NVGPU_KERNEL_IS_DYING flgas are set. Bug 3806514 Change-Id: Id78d92f30b75aba1aee22398cc86a3acebd50ef6 Signed-off-by: Divya <dsinghatwari@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2798003 (cherry picked from commit d9345065bcb6d9ff497c127fa4cd52077f4ecfa4) Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2807245 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com> Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>