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power_supply: sysfs: Bring back write to writeable properties

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The fix for NULL pointer exception related to calling uevent for not
finished probe caused to set all writeable properties as non-writeable.
This was caused by checking if property is writeable before the initial
increase of power supply usage counter and in the same time using
wrapper over property_is_writeable(). The wrapper returns ENODEV if the
usage counter is still 0.

The call trace looked like:
  device probe:
    power_supply_register()
      use_cnt = 0;
      device_add()
        create sysfs entries
          power_supply_attr_is_visible()
            power_supply_property_is_writeable()
              if (use_cnt == 0) return -ENODEV;
      use_cnt++;

Replace the usage of wrapper with direct call to property_is_writeable()
from driver. This should be safe call during device probe because
implementations of this callback just return 0/1 for different
properties and they do not access any of the driver's internal data.

Fixes: 8e59c7f234 ("power_supply: Fix NULL pointer dereference during bq27x00_battery probe")
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Krzysztof Kozlowski 2015-06-08 10:09:48 +09:00 committed by Sebastian Reichel
parent fb323eccbc
commit 5c6e3a97e9
2 changed files with 6 additions and 1 deletions
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2
drivers/power/power_supply_sysfs.c
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@ -223,7 +223,7 @@ static umode_t power_supply_attr_is_visible(struct kobject *kobj,
if (property == attrno) {
if (psy->desc->property_is_writeable &&
power_supply_property_is_writeable(psy, property) > 0)
psy->desc->property_is_writeable(psy, property) > 0)
mode |= S_IWUSR;
return mode;

5
include/linux/power_supply.h
View File

@ -206,6 +206,11 @@ struct power_supply_desc {
int (*set_property)(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val);
/*
* property_is_writeable() will be called during registration
* of power supply. If this happens during device probe then it must
* not access internal data of device (because probe did not end).
*/
int (*property_is_writeable)(struct power_supply *psy,
enum power_supply_property psp);
void (*external_power_changed)(struct power_supply *psy);