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ACPI: battery: Simplify battery hook locking

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[ Upstream commit 86309cbed2 ]

Move the conditional locking from __battery_hook_unregister()
into battery_hook_unregister() and rename the low-level function
to simplify the locking during battery hook removal.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://patch.msgid.link/20241001212835.341788-2-W_Armin@gmx.de
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Stable-dep-of: 76959aff14 ("ACPI: battery: Fix possible crash when unregistering a battery hook")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Armin Wolf 2024-10-01 23:28:33 +02:00 committed by Greg Kroah-Hartman
parent 712d30f9a5
commit 2deeb3c748
1 changed files with 9 additions and 9 deletions
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18
drivers/acpi/battery.c
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@ -703,28 +703,28 @@ static LIST_HEAD(acpi_battery_list);
static LIST_HEAD(battery_hook_list);
static DEFINE_MUTEX(hook_mutex);
static void __battery_hook_unregister(struct acpi_battery_hook *hook, int lock)
static void battery_hook_unregister_unlocked(struct acpi_battery_hook *hook)
{
struct acpi_battery *battery;
/*
* In order to remove a hook, we first need to
* de-register all the batteries that are registered.
*/
if (lock)
mutex_lock(&hook_mutex);
list_for_each_entry(battery, &acpi_battery_list, list) {
if (!hook->remove_battery(battery->bat, hook))
power_supply_changed(battery->bat);
}
list_del(&hook->list);
if (lock)
mutex_unlock(&hook_mutex);
pr_info("extension unregistered: %s\n", hook->name);
}
void battery_hook_unregister(struct acpi_battery_hook *hook)
{
__battery_hook_unregister(hook, 1);
mutex_lock(&hook_mutex);
battery_hook_unregister_unlocked(hook);
mutex_unlock(&hook_mutex);
}
EXPORT_SYMBOL_GPL(battery_hook_unregister);
@ -750,7 +750,7 @@ void battery_hook_register(struct acpi_battery_hook *hook)
* hooks.
*/
pr_err("extension failed to load: %s", hook->name);
__battery_hook_unregister(hook, 0);
battery_hook_unregister_unlocked(hook);
goto end;
}
@ -789,7 +789,7 @@ static void battery_hook_add_battery(struct acpi_battery *battery)
*/
pr_err("error in extension, unloading: %s",
hook_node->name);
__battery_hook_unregister(hook_node, 0);
battery_hook_unregister_unlocked(hook_node);
}
}
mutex_unlock(&hook_mutex);
@ -822,7 +822,7 @@ static void __exit battery_hook_exit(void)
* need to remove the hooks.
*/
list_for_each_entry_safe(hook, ptr, &battery_hook_list, list) {
__battery_hook_unregister(hook, 1);
battery_hook_unregister(hook);
}
mutex_destroy(&hook_mutex);
}