linux-kernel - Re: [PATCH RFC v2 3/5] power: supply: core: implement extension API

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Date: Thu, 20 Jun 2024 01:14:01 +0200
From: Armin Wolf <W_Armin@....de>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Sebastian Reichel <sre@...nel.org>, linux-pm@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v2 3/5] power: supply: core: implement extension API

Am 14.06.24 um 09:02 schrieb Thomas Weißschuh:

> Hi!
>
> On 2024-06-14 01:11:29+0000, Armin Wolf wrote:
>> Am 08.06.24 um 21:19 schrieb Thomas Weißschuh:
>>
>>> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
>>> ---
>>>    drivers/power/supply/power_supply.h       |  13 ++-
>>>    drivers/power/supply/power_supply_core.c  | 128 ++++++++++++++++++++++++++++--
>>>    drivers/power/supply/power_supply_hwmon.c |   2 +-
>>>    drivers/power/supply/power_supply_sysfs.c |  37 ++++++++-
>>>    include/linux/power_supply.h              |  26 ++++++
>>>    5 files changed, 192 insertions(+), 14 deletions(-)
>>>
>>> diff --git a/drivers/power/supply/power_supply.h b/drivers/power/supply/power_supply.h
>>> index 622be1f0a180..686b66161900 100644
>>> --- a/drivers/power/supply/power_supply.h
>>> +++ b/drivers/power/supply/power_supply.h
>>> @@ -13,8 +13,17 @@ struct device;
>>>    struct device_type;
>>>    struct power_supply;
>>>
>>> -extern bool power_supply_has_property(const struct power_supply_desc *psy_desc,
>>> -				      enum power_supply_property psp);
>>> +struct psy_ext_registration {
>>> +	struct list_head list_head;
>>> +	const struct power_supply_ext *ext;
>>> +};
>>> +
>>> +#define psy_for_each_extension(psy, pos) list_for_each_entry(pos, &(psy)->extensions, list_head)
>> sorry for taking so long to respond, the patch looks good to me except one single thing:
>>
>> when removing a power supply extension, the driver has to be sure that no one is still using
>> the removed extension. So you might want to add some sort of locking when using a power supply
>> extension.
> That was part of the v1 of the series [0].
> I dropped it in v2 to focus on the external API and semantics first.
> IMO now that we have the loop macro anyways that can also take care of
> the locking: psy_for_each_extension_locked()
>
> [0] https://lore.kernel.org/all/20240606-power-supply-extensions-v1-4-b45669290bdc@weissschuh.net/
>
> Thomas

Sounds good to me.

Thanks,
Armin Wolf

> <snip>