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There is a possible deadlock that gets triggered when device is being resumed() and NVS worker thread tries to submit the data as part of the post_process() operation. The NVS worker thread works asynchronously in the post_process() part w.r.t the USER threads and thus an initial implementation requires acquiring the busy lock() arriving at a deadlock scenario. This quick change shall disallow post_process() from executing during the case where we have only one scheduling domain present(legacy) Any submits meant to be updated are handled via the synchronous wakeup_process_item() callback. This implementation is being modified to allow the worker thread to be suspended/resumed during GPU railgate/unrailgate in upcoming releases and currently is in a state of flux. Bug 3723127 Signed-off-by: Debarshi Dutta <ddutta@nvidia.com> Change-Id: I318cda0fbdd5651884cf21f748c86687679e6fdb Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2750293 Reviewed-by: Prateek Sethi <prsethi@nvidia.com> Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com> GVS: Gerrit_Virtual_Submit