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Previously, nvgpu_sw_quiesce_remove_support() stopped the quiesce thread abruptly with nvgpu_thread_stop(), which could mean the thread was killed while still waiting on the cond. Then when the cond was destroyed, there may be an error since the underlying implementation may think there is still a thread waiting (such as the Posix implementation). Change nvgpu_sw_quiesce_remove_support() to use nvgpu_thread_stop_graceful() and signal the cond in the callback after the thread is marked to be stopped. The quiesce thread will then wake up from the cond wait and see the thread should stop. JIRA NVGPU-4987 Change-Id: I29322d7867acc33a91092016c540e00bb1ae945a Signed-off-by: Philip Elcan <pelcan@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2306024 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com> Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com> Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: Thomas Fleury <tfleury@nvidia.com> Reviewed-by: Alex Waterman <alexw@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>