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If the new governor fails to start, switch back to old governor so that the devfreq state is not left in some weird limbo. [Myungjoo: assume fatal on revert failure and set df->governor to NULL] Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Signed-off-by: Saravana Kannan <skannan@codeaurora.org> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>