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PM / OPP: Don't use OPP structure outside of rcu protected section

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The OPP structure must not be used out of the rcu protected section.
Cache the values to be used in separate variables instead.

Cc: 4.6+ <stable@vger.kernel.org> # 4.6+
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Tested-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2016-12-01 16:28:16 +05:30 • committed by Rafael J. Wysocki
commit dc39d06fcd
1 changed files with 13 additions and 3 deletions
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16
drivers/base/power/opp/core.c
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@ -584,6 +584,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
struct clk *clk;
unsigned long freq, old_freq;
unsigned long u_volt, u_volt_min, u_volt_max;
unsigned long old_u_volt, old_u_volt_min, old_u_volt_max;
int ret;
if (unlikely(!target_freq)) {
@ -633,6 +634,14 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
return ret;
}
if (IS_ERR(old_opp)) {
old_u_volt = 0;
} else {
old_u_volt = old_opp->u_volt;
old_u_volt_min = old_opp->u_volt_min;
old_u_volt_max = old_opp->u_volt_max;
}
u_volt = opp->u_volt;
u_volt_min = opp->u_volt_min;
u_volt_max = opp->u_volt_max;
@ -677,9 +686,10 @@ restore_freq:
__func__, old_freq);
restore_voltage:
/* This shouldn't harm even if the voltages weren't updated earlier */
if (!IS_ERR(old_opp))
_set_opp_voltage(dev, reg, old_opp->u_volt,
old_opp->u_volt_min, old_opp->u_volt_max);
if (old_u_volt) {
_set_opp_voltage(dev, reg, old_u_volt, old_u_volt_min,
old_u_volt_max);
}
return ret;
}