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PowerCap: Fix mode for energy counter

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As per the documentation of powercap sysfs, energy_uj field is read only,
if it can't be reset. Currently it always allows write but will fail,
if there is no reset callback.
Changing mode field, to read only if there is no reset callback.

Signed-off-by: Srinivas Pandruvada <[email protected]>
Reported-by: Dirk Brandewie <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Srinivas Pandruvada authored and Rafael J. Wysocki committed 2013-12-05 02:05:48 +01:00
1 parent 08ff4cbe10
commit 95677a9a38
1 file changed
+6 -1
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drivers/powercap/powercap_sys.c
+6 -1
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@@ -377,9 +377,14 @@ static void create_power_zone_common_attributes(
if (power_zone->ops->get_max_energy_range_uj)
power_zone->zone_dev_attrs[count++] =
&dev_attr_max_energy_range_uj.attr;
if (power_zone->ops->get_energy_uj)
if (power_zone->ops->get_energy_uj) {
if (power_zone->ops->reset_energy_uj)
dev_attr_energy_uj.attr.mode = S_IWUSR | S_IRUGO;
else
dev_attr_energy_uj.attr.mode = S_IRUGO;
power_zone->zone_dev_attrs[count++] =
&dev_attr_energy_uj.attr;
}
if (power_zone->ops->get_power_uw)
power_zone->zone_dev_attrs[count++] =
&dev_attr_power_uw.attr;