From: Hans de Goede Date: Sun, 8 Sep 2024 18:53:36 +0000 (+0200) Subject: power: supply: Drop use_cnt check from power_supply_property_is_writeable() X-Git-Tag: v6.12~435^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=78f281e5bdeb6476fab97a2c3fcece1094b42aaf;p=platform%2Fkernel%2Flinux-amlogic.git power: supply: Drop use_cnt check from power_supply_property_is_writeable() power_supply_property_is_writeable() gets called from the is_visible() callback for the sysfs attributes of power_supply class devices and for the sysfs attributes of power_supply core instantiated hwmon class devices. These sysfs attributes get registered by the device_add() respectively power_supply_add_hwmon_sysfs() calls in power_supply_register(). use_cnt gets initialized to 0 and is incremented only after these calls. So when power_supply_property_is_writeable() gets called it always return -ENODEV because of use_cnt == 0. This causes all the attributes to have permissions of 444 even those which should be writable. This used to be a problem only for hwmon sysfs attributes but since commit be6299c6e55e ("power: supply: sysfs: use power_supply_property_is_writeable()") this now also impacts power_supply class sysfs attributes. Fixes: be6299c6e55e ("power: supply: sysfs: use power_supply_property_is_writeable()") Fixes: e67d4dfc9ff1 ("power: supply: Add HWMON compatibility layer") Cc: stable@vger.kernel.org Cc: Thomas Weißschuh Cc: Andrey Smirnov Signed-off-by: Hans de Goede Link: https://lore.kernel.org/stable/20240908185337.103696-1-hdegoede%40redhat.com Link: https://lore.kernel.org/r/20240908185337.103696-1-hdegoede@redhat.com Signed-off-by: Sebastian Reichel --- diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c index 0417fb34e846..49534458a9f7 100644 --- a/drivers/power/supply/power_supply_core.c +++ b/drivers/power/supply/power_supply_core.c @@ -1231,11 +1231,7 @@ EXPORT_SYMBOL_GPL(power_supply_set_property); int power_supply_property_is_writeable(struct power_supply *psy, enum power_supply_property psp) { - if (atomic_read(&psy->use_cnt) <= 0 || - !psy->desc->property_is_writeable) - return -ENODEV; - - return psy->desc->property_is_writeable(psy, psp); + return psy->desc->property_is_writeable && psy->desc->property_is_writeable(psy, psp); } EXPORT_SYMBOL_GPL(power_supply_property_is_writeable);