cpufreq: cpufreq-dt: Handle regulator_get_voltage() failure

In error cases regulator_get_voltage() returns a negative value.
So take care of it.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 725fb1d..8cba13d 100644 (file)
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -78,7 +78,7 @@ static int set_target(struct cpufreq_policy *policy, unsigned int index)
        }
 
        dev_dbg(cpu_dev, "%u MHz, %ld mV --> %u MHz, %ld mV\n",
-               old_freq / 1000, volt_old ? volt_old / 1000 : -1,
+               old_freq / 1000, (volt_old > 0) ? volt_old / 1000 : -1,
                new_freq / 1000, volt ? volt / 1000 : -1);
 
        /* scaling up?  scale voltage before frequency */
@@ -94,7 +94,7 @@ static int set_target(struct cpufreq_policy *policy, unsigned int index)
        ret = clk_set_rate(cpu_clk, freq_exact);
        if (ret) {
                dev_err(cpu_dev, "failed to set clock rate: %d\n", ret);
-               if (!IS_ERR(cpu_reg))
+               if (!IS_ERR(cpu_reg) && volt_old > 0)
                        regulator_set_voltage_tol(cpu_reg, volt_old, tol);
                return ret;
        }