lkml.org 
[lkml]   [2022]   [Sep]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 1/5] ACPI: battery: Do not unload battery hooks on single error
From
Date
Am 19.09.22 um 18:27 schrieb Rafael J. Wysocki:

> On Mon, Sep 19, 2022 at 12:42 PM Hans de Goede <hdegoede@redhat.com> wrote:
>> Hi,
>>
>> On 9/12/22 13:53, Armin Wolf wrote:
>>> Currently, battery hooks are being unloaded if they return
>>> an error when adding a single battery.
>>> This however also causes the removal of successfully added
>>> hooks if they return -ENODEV for a single unsupported
>>> battery.
>>>
>>> Do not unload battery hooks in such cases since the hook
>>> handles any cleanup actions.
>>>
>>> Signed-off-by: Armin Wolf <W_Armin@gmx.de>
>> Maybe instead of removing all error checking, allow -ENODEV
>> and behave as before when the error is not -ENODEV ?
>>
>> Otherwise we should probably make the add / remove callbacks
>> void to indicate that any errors are ignored.
>>
>> Rafael, do you have any opinion on this?
> IMV this is not a completely safe change, because things may simply
> not work in the cases in which an error is returned.
>
> It would be somewhat better to use a special error code to indicate
> "no support" (eg. -ENOTSUPP) and ignore that one only.

I would favor -ENODEV then, since it is already used by quiet a few drivers
to indicate a unsupported battery.

Armin Wolf

>>> ---
>>> drivers/acpi/battery.c | 24 +++---------------------
>>> 1 file changed, 3 insertions(+), 21 deletions(-)
>>>
>>> diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
>>> index 306513fec1e1..e59c261c7c59 100644
>>> --- a/drivers/acpi/battery.c
>>> +++ b/drivers/acpi/battery.c
>>> @@ -724,20 +724,10 @@ void battery_hook_register(struct acpi_battery_hook *hook)
>>> * its attributes.
>>> */
>>> list_for_each_entry(battery, &acpi_battery_list, list) {
>>> - if (hook->add_battery(battery->bat)) {
>>> - /*
>>> - * If a add-battery returns non-zero,
>>> - * the registration of the extension has failed,
>>> - * and we will not add it to the list of loaded
>>> - * hooks.
>>> - */
>>> - pr_err("extension failed to load: %s", hook->name);
>>> - __battery_hook_unregister(hook, 0);
>>> - goto end;
>>> - }
>>> + hook->add_battery(battery->bat);
>>> }
>>> pr_info("new extension: %s\n", hook->name);
>>> -end:
>>> +
>>> mutex_unlock(&hook_mutex);
>>> }
>>> EXPORT_SYMBOL_GPL(battery_hook_register);
>>> @@ -762,15 +752,7 @@ static void battery_hook_add_battery(struct acpi_battery *battery)
>>> * during the battery module initialization.
>>> */
>>> list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
>>> - if (hook_node->add_battery(battery->bat)) {
>>> - /*
>>> - * The notification of the extensions has failed, to
>>> - * prevent further errors we will unload the extension.
>>> - */
>>> - pr_err("error in extension, unloading: %s",
>>> - hook_node->name);
>>> - __battery_hook_unregister(hook_node, 0);
>>> - }
>>> + hook_node->add_battery(battery->bat);
>>> }
>>> mutex_unlock(&hook_mutex);
>>> }
>>> --
>>> 2.30.2
>>>

\
 
 \ /
  Last update: 2022-09-19 21:13    [W:0.751 / U:0.000 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site