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authorNishanth Menon <nm@ti.com>2012-10-26 01:50:43 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-11-15 00:35:05 +0100
commit12e26265e6225bf93b2fdc70399774b31e2dd980 (patch)
tree623fba6c1690ab23f8aeed388be9dfb3506ef07e /drivers/devfreq
parentc5b4a1c15da3e6f472c6ff1a085a1134d18a1464 (diff)
PM / devfreq: fix sscanf handling for writable sysfs entries
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>
Diffstat (limited to 'drivers/devfreq')
-rw-r--r--drivers/devfreq/devfreq.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index a42f69b34eb2..79a7343c28a6 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -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;
}