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Below are the hypothetical scenarios - Drivers are in suspend state while reboot and PCM Open call from userspace is received after driver shutdown [APE is power gated already] - PM domain handling doesn't ensure proper functionality after driver shutdown is called The change handles with the beloe fix - ALSA PCM Open API first executes runtime resume of each driver. So need to prevent any reg access in runtime resume of drivers. - ALSA PCM Open executes ADMAIF startup after runtime resume of each driver. If ADMAIF startup returns failure based on shutdown, PCM Open operation will fail, this will break PCM Open path and will ensure no further ALSA APIs/Callbacks are called. Bug 200289815 Change-Id: I46060d74b3271a870a0bcfc727972c97e2a73931 Signed-off-by: Mohan Kumar <mkumard@nvidia.com> Reviewed-on: http://git-master/r/1475216 Reviewed-on: http://git-master/r/1499116 Reviewed-by: Automatic_Commit_Validation_User Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com> GVS: Gerrit_Virtual_Submit Reviewed-by: Sameer Pujar <spujar@nvidia.com> Reviewed-by: Dipesh Gandhi <dipeshg@nvidia.com> Reviewed-by: Ravindra Lokhande <rlokhande@nvidia.com> Reviewed-on: http://git-master/r/1502050 Reviewed-by: Sachin Nikam <snikam@nvidia.com> Tested-by: Sachin Nikam <snikam@nvidia.com>