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PM / devfreq: fix sscanf handling for writable sysfs entries

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sscanf returns 0 when an invalid parameter like:
echo -n "a">min_freq
is attempted. Returning back the return result(0) will
cause the command not to return back to command
prompt.

Instead, just return -EINVAL when sscanf does not
return 1.

This is done for min_freq, max_freq and polling_interval

Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Nishanth Menon 2012-10-26 01:50:43 +02:00 committed by Rafael J. Wysocki
parent c5b4a1c15d
commit 12e26265e6
1 changed files with 3 additions and 6 deletions
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9
drivers/devfreq/devfreq.c
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@ -496,12 +496,11 @@ static ssize_t store_polling_interval(struct device *dev,
ret = sscanf(buf, "%u", &value);
if (ret != 1)
goto out;
return -EINVAL;
df->governor->event_handler(df, DEVFREQ_GOV_INTERVAL, &value);
ret = count;
out:
return ret;
}
@ -515,7 +514,7 @@ static ssize_t store_min_freq(struct device *dev, struct device_attribute *attr,
ret = sscanf(buf, "%lu", &value);
if (ret != 1)
goto out;
return -EINVAL;
mutex_lock(&df->lock);
max = df->max_freq;
@ -529,7 +528,6 @@ static ssize_t store_min_freq(struct device *dev, struct device_attribute *attr,
ret = count;
unlock:
mutex_unlock(&df->lock);
out:
return ret;
}
@ -549,7 +547,7 @@ static ssize_t store_max_freq(struct device *dev, struct device_attribute *attr,
ret = sscanf(buf, "%lu", &value);
if (ret != 1)
goto out;
return -EINVAL;
mutex_lock(&df->lock);
min = df->min_freq;
@ -563,7 +561,6 @@ static ssize_t store_max_freq(struct device *dev, struct device_attribute *attr,
ret = count;
unlock:
mutex_unlock(&df->lock);
out:
return ret;
}