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We right now submit new runlist and wait for submit to complete in gk20a_fifo_update_runlist_locked() It is possible that multiple runlists are being updated in parallel by multiple threads since the lock taken by parent of gk20a_fifo_update_runlist_locked() is per-runlist Note that the concurrent threads would still construct their runlists into per-runlist buffer But we still have a race condition while submitting these runlists to hardware. With an application that creates and destroys multiple contexts in parallel this race condition gets realized and we see h/w reporting an error interrupt NV_PFIFO_INTR_SCHED_ERROR_CODE_BAD_TSG which means a bad TSG was submitted Fix this by adding a global lock for runlist submit and wait sequence This ensures that concurrent threads do not try to submit runlists to the hardware at the same time Bug 200452543 Bug 2405416 Change-Id: I2660a2e5d9af1da400e7f865361722dc0914f96f Signed-off-by: Deepak Nibade <dnibade@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1851114 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-misra-checker <svc-misra-checker@nvidia.com> GVS: Gerrit_Virtual_Submit Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>