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PM / QoS: Improve sysfs pm_qos_latency_tolerance validation

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Negative values are special.  Don't let users write them directly.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Andrew Lutomirski 2016-11-29 17:11:50 -08:00 committed by Rafael J. Wysocki
parent e5517c2a5a
commit ee061da8d9
1 changed files with 5 additions and 1 deletions
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6
drivers/base/power/sysfs.c
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@ -263,7 +263,11 @@ static ssize_t pm_qos_latency_tolerance_store(struct device *dev,
s32 value;
int ret;
if (kstrtos32(buf, 0, &value)) {
if (kstrtos32(buf, 0, &value) == 0) {
/* Users can't write negative values directly */
if (value < 0)
return -EINVAL;
} else {
if (!strcmp(buf, "auto") || !strcmp(buf, "auto\n"))
value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
else if (!strcmp(buf, "any") || !strcmp(buf, "any\n"))