[PATCH v2] power_supply: fix return value of get_property

Rhyland Klein
2016-06-15T22:13:30Z

power_supply_get_property() should ideally return -EAGAIN if it is
called while the power_supply is being registered. There was no way
previously to determine if use_cnt == 0 meant that the power_supply
wasn't fully registered yet, or if it had already been unregistered.

Add a new boolean to the power_supply struct to simply show if
registration is completed. Lastly, modify the check in
power_supply_show_property() to also ignore -EAGAIN when so it
doesn't complain about not returning the property.

Signed-off-by: Rhyland Klein <rklein@nvidia.com>
---
v2:
- Modify power_supply_show_property() to not complain if it
sees a return value of -EAGAIN after calling
power_supply_get_property().

drivers/power/power_supply_core.c | 6 +++++-
drivers/power/power_supply_sysfs.c | 2 +-
include/linux/power_supply.h | 1 +
3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index b13cd074c52a..a39a47672979 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -491,8 +491,11 @@ int power_supply_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
- if (atomic_read(&psy->use_cnt) <= 0)
+ if (atomic_read(&psy->use_cnt) <= 0) {
+ if (!psy->initialized)
+ return -EAGAIN;
return -ENODEV;
+ }

return psy->desc->get_property(psy, psp, val);
}
@@ -775,6 +778,7 @@ __power_supply_register(struct device *parent,
if (rc)
goto create_triggers_failed;

+ psy->initialized = true;
/*
* Update use_cnt after any uevents (most notably from device_add()).
* We are here still during driver's probe but
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index 80fed98832f9..bcde8d13476a 100644
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -83,7 +83,7 @@ static ssize_t power_supply_show_property(struct device *dev,
if (ret == -ENODATA)
dev_dbg(dev, "driver has no data for `%s' property\n",
attr->attr.name);
- else if (ret != -ENODEV)
+ else if (ret != -ENODEV && ret != -EAGAIN)
dev_err(dev, "driver failed to report `%s' property: %zd\n",
attr->attr.name, ret);
return ret;
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 751061790626..3965503315ef 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -248,6 +248,7 @@ struct power_supply {
struct delayed_work deferred_register_work;
spinlock_t changed_lock;
bool changed;
+ bool initialized;
atomic_t use_cnt;
#ifdef CONFIG_THERMAL
struct thermal_zone_device *tzd;
--
1.9.1