power_supply: Ignore -ENODATA errors when generating uevents

Sometimes a driver can not report a meaningful value for a certain property
and returns -ENODATA.

Currently when generating a uevent and a property return -ENODATA it is
treated as an error an no uevent is generated at all. This is not an
desirable behavior.

This patch adds a special case for -ENODATA and ignores properties which
return this error code when generating the uevent.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Grazvydas Ignotas <notasas@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index cd1f90754a3a..605514afc29f 100644
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -270,7 +270,7 @@ int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
                 attr = &power_supply_attrs[psy->properties[j]];
 
                 ret = power_supply_show_property(dev, attr, prop_buf);
-                if (ret == -ENODEV) {
+                if (ret == -ENODEV || ret == -ENODATA) {
                         /* When a battery is absent, we expect -ENODEV. Don't abort;
                            send the uevent with at least the the PRESENT=0 property */
                         ret = 0;