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This prevents other task events from continuing the ADC conversion prematurely; potentially leading to a panic if the conversion interrupt occurs after the ADC has been powered down. BUG=chrome-os-partner:26919 BRANCH=rambi TEST=Perform ADC conversions while running a deferred function calling itself on a 10mSec delay. Verify no panics after ~6 hours. Change-Id: Ic3894849c154b3f058e812b2da816e7cffb12cbf Signed-off-by: Dave Parker <dparker@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/191302 Reviewed-by: Randall Spangler <rspangler@chromium.org>