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    Subject[PATCH 4.9 39/77] cpufreq: powernv: Dont assume distinct pstate values for nominal and pmin
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>

    commit 3fa4680b860bf48b437d6a2c039789c4abe202ae upstream.

    Some OpenPOWER boxes can have same pstate values for nominal and
    pmin pstates. In these boxes the current code will not initialize
    'powernv_pstate_info.min' variable and result in erroneous CPU
    frequency reporting. This patch fixes this problem.

    Fixes: 09ca4c9b5958 (cpufreq: powernv: Replacing pstate_id with frequency table index)
    Reported-by: Alvin Wang <wangat@tw.ibm.com>
    Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
    Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
    Cc: 4.8+ <stable@vger.kernel.org> # 4.8+
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/cpufreq/powernv-cpufreq.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/drivers/cpufreq/powernv-cpufreq.c
    +++ b/drivers/cpufreq/powernv-cpufreq.c
    @@ -260,9 +260,9 @@ static int init_powernv_pstates(void)

    if (id == pstate_max)
    powernv_pstate_info.max = i;
    - else if (id == pstate_nominal)
    + if (id == pstate_nominal)
    powernv_pstate_info.nominal = i;
    - else if (id == pstate_min)
    + if (id == pstate_min)
    powernv_pstate_info.min = i;
    }


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