cpufreq: omap: call CPUFREQ_POSTCHANGE notfier in error cases

PRECHANGE and POSTCHANGE notifiers must be called in groups, i.e either both
should be called or both shouldn't be.

In case we have started PRECHANGE notifier and found an error, we must call
POSTCHANGE notifier with freqs.new = freqs.old to guarantee that sequence of
calling notifiers is complete.

Omap driver was taking care of it well, but wasn't restoring freqs.new to
freqs.old in some cases. I wasn't required to add code for it as moving
PRECHANGE notifier down was a better option, so that we call it just before
starting frequency transition.

Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c
index 0279d18a57f96499bc3f67a5a9c4e8e0ce785081..29468a522ee9a799180b8cf18b178bb43d16acb7 100644 (file)
--- a/drivers/cpufreq/omap-cpufreq.c
+++ b/drivers/cpufreq/omap-cpufreq.c
@@ -93,9 +93,6 @@ static int omap_target(struct cpufreq_policy *policy,
        if (freqs.old == freqs.new && policy->cur == freqs.new)
                return ret;
 
-       /* notifiers */
-       cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
-
        freq = freqs.new * 1000;
        ret = clk_round_rate(mpu_clk, freq);
        if (IS_ERR_VALUE(ret)) {
@@ -125,6 +122,9 @@ static int omap_target(struct cpufreq_policy *policy,
                freqs.old / 1000, volt_old ? volt_old / 1000 : -1,
                freqs.new / 1000, volt ? volt / 1000 : -1);
 
+       /* notifiers */
+       cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
+
        /* scaling up?  scale voltage before frequency */
        if (mpu_reg && (freqs.new > freqs.old)) {
                r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);