> --- a/drivers/devfreq/devfreq.c
> +++ b/drivers/devfreq/devfreq.c
> @@ -629,6 +629,44 @@ static ssize_t show_governor(struct device *dev,
> return sprintf(buf, "%s\n", to_devfreq(dev)->governor->name);
> }
>
> +static ssize_t store_governor(struct device *dev, struct device_attribute
> *attr,
> + const char *buf, size_t count)
> +{
> + struct devfreq *df = to_devfreq(dev);
> + int ret = 0;
> + struct devfreq_governor *governor;
> +
> + mutex_lock(&devfreq_list_lock);
Please remove the trailing \n from buf here.
When user enters "userspace", buf gets "userspace\n".
With some printks in find_devfreq_governor (printing the buf and governor
names):
# echo userspace > /sys/class/devfreq/exynos4210-busfreq.0/governor
[ 65.975000] [userspace
[ 65.975000] ].[userspace]
[ 65.980000] [userspace
[ 65.980000] ].[powersave]
[ 65.985000] [userspace
[ 65.985000] ].[performance]
[ 65.990000] [userspace
[ 65.990000] ].[simple_ondemand]
[ 65.995000] err no = -19
#
Cheers,
MyungJoo
> + governor = find_devfreq_governor(buf);
> + if (IS_ERR(governor)) {
> + ret = PTR_ERR(governor);
> + goto out;
> + }
> + if (df->governor == governor)
> + goto out;
> +
> + if (df->governor) {
> + ret = df->governor->event_handler(df, DEVFREQ_GOV_STOP, NULL);
> + if (ret) {
> + dev_warn(dev, "%s: Governor %s not stopped(%d)\n",
> + __func__, df->governor->name, ret);
> + goto out;
> + }
> + }
> + df->governor = governor;
> + strncpy(df->governor_name, governor->name, DEVFREQ_NAME_LEN);
> + ret = df->governor->event_handler(df, DEVFREQ_GOV_START, NULL);
> + if (ret)
> + dev_warn(dev, "%s: Governor %s not started(%d)\n",
> + __func__, df->governor->name, ret);
> +out:
> + mutex_unlock(&devfreq_list_lock);
> +
> + if (!ret)
> + ret = count;
> + return ret;
> +}
> +
[]
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