diff options
| author |   Rhyland Klein <rklein@nvidia.com> | 2016-06-22 11:45:52 -0400 |
|---|---|---|
| committer |   Sebastian Reichel <sre@kernel.org> | 2016-07-01 22:44:34 +0200 |
| commit | e380538529e83c5d3fd27e8cbfcc1f9799cb6bbb (patch) | |
| tree | a3893523e57344dd71c906c137987ff233bd31b4 | |
| parent | power: qcom_smbb: Make an extcon for usb cable detection (diff) | |
| download | linux-dev-e380538529e83c5d3fd27e8cbfcc1f9799cb6bbb.tar.xz linux-dev-e380538529e83c5d3fd27e8cbfcc1f9799cb6bbb.zip | |
power_supply: fix return value of get_property
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>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
| -rw-r--r-- | drivers/power/power_supply_core.c | 6 | ||||
| -rw-r--r-- | drivers/power/power_supply_sysfs.c | 2 | ||||
| -rw-r--r-- | 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 456987c88baa..c2ef0c0dfa9d 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); } @@ -780,6 +783,7 @@ __power_supply_register(struct device *parent, * after calling power_supply_register()). */ atomic_inc(&psy->use_cnt); + psy->initialized = true; queue_delayed_work(system_power_efficient_wq, &psy->deferred_register_work, 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; |