[PATCH 6.11 regression fix 1/2] power: supply: Drop use_cnt check from power_supply_property_is_writeable()

[Hans de Goede <hdegoede@redhat.com>]

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 <linux@weissschuh.net>
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
The fixing of be6299c6e55e is a 6.11 regression fix, the fixing of
e67d4dfc9ff1 hwmon attr never being writable is a stable series fix.

This supersedes the "power: supply: sysfs: Revert use
power_supply_property_is_writeable()" patch.
---
 drivers/power/supply/power_supply_core.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

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);
 
-- 
2.46.0