On 6/29/2023 6:05 PM, Rafael J. Wysocki wrote:
> On Fri, Jun 16, 2023 at 6:51 PM Michal Wilczynski
> <michal.wilczynski@xxxxxxxxx> wrote:
>> Currently logic for installing notifications from ACPI devices is
>> implemented using notify callback in struct acpi_driver. Preparations
>> are being made to replace acpi_driver with more generic struct
>> platform_driver, which doesn't contain notify callback. Furthermore
>> as of now handlers are being called indirectly through
>> acpi_notify_device(), which decreases performance.
>>
>> Call acpi_dev_install_notify_handler() at the end of .add() callback.
>> Call acpi_dev_remove_notify_handler() at the beginning of .remove()
>> callback. Change arguments passed to the notify function to match with
>> what's required by acpi_install_notify_handler(). Remove .notify
>> callback initialization in acpi_driver.
>>
>> While at it, fix lack of whitespaces in .remove() callback.
>>
>> Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>> Signed-off-by: Michal Wilczynski <michal.wilczynski@xxxxxxxxx>
>> ---
>> drivers/acpi/battery.c | 30 ++++++++++++++++++++++++------
>> 1 file changed, 24 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
>> index 9c67ed02d797..6337e7b1f6e1 100644
>> --- a/drivers/acpi/battery.c
>> +++ b/drivers/acpi/battery.c
>> @@ -1034,11 +1034,14 @@ static void acpi_battery_refresh(struct acpi_battery *battery)
>> }
>>
>> /* Driver Interface */
>> -static void acpi_battery_notify(struct acpi_device *device, u32 event)
>> +static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
>> {
>> - struct acpi_battery *battery = acpi_driver_data(device);
>> + struct acpi_device *device = data;
>> + struct acpi_battery *battery;
>> struct power_supply *old;
>>
>> + battery = acpi_driver_data(device);
>> +
>> if (!battery)
>> return;
>> old = battery->bat;
>> @@ -1212,13 +1215,23 @@ static int acpi_battery_add(struct acpi_device *device)
>>
>> device_init_wakeup(&device->dev, 1);
>>
>> - return result;
>> + result = acpi_dev_install_notify_handler(device,
>> + ACPI_ALL_NOTIFY,
>> + acpi_battery_notify);
>> + if (result)
>> + goto fail_deinit_wakup_and_unregister;
> You could call the label "fail_pm", for example, which would be more
> concise and so slightly easier to follow, without any loss of clarity
> AFAICS.
Sure
>
>> +
>> + return 0;
>>
>> +fail_deinit_wakup_and_unregister:
>> + device_init_wakeup(&device->dev, 0);
>> + unregister_pm_notifier(&battery->pm_nb);
>> fail:
>> sysfs_remove_battery(battery);
>> mutex_destroy(&battery->lock);
>> mutex_destroy(&battery->sysfs_lock);
>> kfree(battery);
>> +
>> return result;
>> }
>>
>> @@ -1228,10 +1241,17 @@ static void acpi_battery_remove(struct acpi_device *device)
>>
>> if (!device || !acpi_driver_data(device))
>> return;
>> - device_init_wakeup(&device->dev, 0);
>> +
>> battery = acpi_driver_data(device);
>> +
>> + acpi_dev_remove_notify_handler(device,
>> + ACPI_ALL_NOTIFY,
>> + acpi_battery_notify);
>> +
>> + device_init_wakeup(&device->dev, 0);
>> unregister_pm_notifier(&battery->pm_nb);
>> sysfs_remove_battery(battery);
>> +
>> mutex_destroy(&battery->lock);
>> mutex_destroy(&battery->sysfs_lock);
>> kfree(battery);
>> @@ -1264,11 +1284,9 @@ static struct acpi_driver acpi_battery_driver = {
>> .name = "battery",
>> .class = ACPI_BATTERY_CLASS,
>> .ids = battery_device_ids,
>> - .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
>> .ops = {
>> .add = acpi_battery_add,
>> .remove = acpi_battery_remove,
>> - .notify = acpi_battery_notify,
>> },
>> .drv.pm = &acpi_battery_pm,
>> };
>> --
>> 2.41.0
>>
