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We right now acquire rulist_submit_mutex to submit runlist and also to wait for submit completion But locking is only needed to atomically configure the runlist submit registers, hence move the locking to inside of gk20a_fifo_runlist_hw_submit() where we program the registers Also convert the mutex to spinlock at the same time Note that similar locking is not required for tu104_fifo_runlist_hw_submit() since the runlist submit registers are per-runlist beginning Turing Bug 200452543 Change-Id: I53d6179b80cb066466b64c6efa9393e55e381bfc Signed-off-by: Deepak Nibade <dnibade@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1919058 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>