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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 below 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: Ia03e035569375f37ae4b0faa1a4593ce121d2354 Signed-off-by: Mohan Kumar <mkumard@nvidia.com> Reviewed-on: http://git-master/r/1475208 (cherry picked from commit 3361e95850563f3009a428bb1c01941ed069a7b0) Reviewed-on: http://git-master/r/1492664 Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com> Reviewed-by: Automatic_Commit_Validation_User GVS: Gerrit_Virtual_Submit Reviewed-by: Dipesh Gandhi <dipeshg@nvidia.com> Reviewed-by: Ravindra Lokhande <rlokhande@nvidia.com>