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power: supply: add stubs for notifier registration helpers

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power_supply_reg_notifier() and power_supply_unreg_notifier() are declared
unconditionally, with no fallback when CONFIG_POWER_SUPPLY is disabled.
Any driver that calls them unconditionally fails to link:

ERROR: modpost: "power_supply_unreg_notifier" [drivers/usb/dwc3/dwc3.ko]
undefined!
ERROR: modpost: "power_supply_reg_notifier" [drivers/usb/dwc3/dwc3.ko]
undefined!

Fix this by adding stub functions for these calls.

Fixes: 7c87ef27af ("usb: dwc3: avoid probe deferral when USB power supply is not available")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Closes: https://lore.kernel.org/all/a9dd53b3-0666-404a-99e0-76617ae3f944@infradead.org/
Signed-off-by: Elson Serrao <elson.serrao@oss.qualcomm.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20260805185401.3625514-1-elson.serrao@oss.qualcomm.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Elson Serrao
2026-08-05 11:54:01 -07:00
committed by Sebastian Reichel
parent 609af0ceea
commit 99b38cda3f
1 changed files with 4 additions and 1 deletions
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5
include/linux/power_supply.h
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@@ -816,15 +816,18 @@ struct power_supply_battery_info {
int bti_resistance_tolerance;
};
#if IS_ENABLED(CONFIG_POWER_SUPPLY)
extern int power_supply_reg_notifier(struct notifier_block *nb);
extern void power_supply_unreg_notifier(struct notifier_block *nb);
#if IS_ENABLED(CONFIG_POWER_SUPPLY)
extern struct power_supply *power_supply_get_by_name(const char *name);
extern int __must_check power_supply_get_system_batteries(struct device *dev,
struct power_supply ***psys);
extern void power_supply_put_system_batteries(struct power_supply **psys, int count);
extern void power_supply_put(struct power_supply *psy);
#else
static inline int power_supply_reg_notifier(struct notifier_block *nb)
{ return -EOPNOTSUPP; }
static inline void power_supply_unreg_notifier(struct notifier_block *nb) {}
static inline void power_supply_put(struct power_supply *psy) {}
static inline struct power_supply *power_supply_get_by_name(const char *name)
{ return NULL; }