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The idling and unidling of deterministic channels in the do_idle/do_unidle path assume that each deterministic channel holds a power reference. This is no longer the case if railgating has been allowed for a channel via the deterministic options ioctl which also causes the channel to drop the power ref that it holds otherwise during its lifetime. All this is happening inside the deterministic_busy rwsem, which also guards the ioctl changing those deterministic option states. Bug 200327089 Change-Id: I9ce312bbaa459b3cf4a7541fa369186b78c3afdc Signed-off-by: Konsta Holtta <kholtta@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1642310 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: Alex Waterman <alexw@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>