From: Armin Wolf <W_Armin@gmx.de>
To: James Seo <james@equiv.tech>
Cc: Jean Delvare <jdelvare@suse.com>,
Guenter Roeck <linux@roeck-us.net>,
linux-hwmon@vger.kernel.org, platform-driver-x86@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] hwmon: add HP WMI Sensors driver
Date: Thu, 27 Apr 2023 18:39:33 +0200 [thread overview]
Message-ID: <de4c28c1-6e70-ceb9-484a-143c2b1ebccc@gmx.de> (raw)
In-Reply-To: <ZEomR842t6QrahyO@equiv.tech>
Am 27.04.23 um 09:37 schrieb James Seo:
> On Wed, Apr 26, 2023 at 09:35:33PM +0200, Armin Wolf wrote:
>> Am 26.04.23 um 15:16 schrieb James Seo:
>>
>>> On Mon, Apr 24, 2023 at 11:13:36PM +0200, Armin Wolf wrote:
>>>> Am 24.04.23 um 12:05 schrieb James Seo:
>>>>
>>>>> + for (i = 0; i < HP_WMI_MAX_INSTANCES; i++, pevents++) {
>>>> Hi,
>>>>
>>>> the WMI driver core already knows how many instances of a given WMI object are available.
>>>> Unfortunately, this information is currently unavailable to drivers. Would it be convenient
>>>> for you to access this information? I could try to implement such a function if needed.
>>>>
>>>>> + for (i = 0; i < HP_WMI_MAX_INSTANCES; i++, info++) {
>>>> Same as above.
>>>>
>>> Hello,
>>>
>>> Having the WMI object instance count wouldn't make much difference to
>>> me for now. The driver has to iterate through all instances during
>>> init anyway. If I were forced to accommodate 50+ sensors, I'd rewrite
>>> some things and I think I'd want such a function then, but I picked
>>> the current arbitrary limit of 32 because even that seems unlikely.
>>>
>>> So, maybe don't worry about it unless you want to. Or am I missing
>>> something?
>>>
>> Hi,
>>
>> i already have a experimental patch available which adds such a function.
>> If you could test this patch to see if it works, then i could submit it upstream
>> where other drivers could profit from being able to know the number of
>> WMI object instances.
>>
> Both your proposed functions worked as expected.
>
>> Your driver could also profit from such a function, as it could optimize the amount
>> of memory allocated to store WMI object data.
> I suppose I might as well. I assume I'm supposed to wait until your
> new functions are merged before making changes that rely on them?
I think you can submit this driver as-is and provide a follow-up patch once
the changes are merged.
>> The current instance discovery algorithm
>> (using a for-loop and break on error) also has a potential issue: when a single WMI call
>> fails for some reason (ACPI error, ...), all following WMI instances are being ignored.
>>
> This is the intended behavior for now, on the assumption that a real
> ACPI failure probably indicates that the system has bigger problems.
> I do have vague plans to make the driver more tolerant of failure to
> retrieve or validate instances, but haven't decided anything yet.
>
> Regards,
>
> James
Ok.
Armin Wolf
prev parent reply other threads:[~2023-04-27 16:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-24 10:05 [PATCH v3] hwmon: add HP WMI Sensors driver James Seo
2023-04-24 21:13 ` Armin Wolf
2023-04-26 13:16 ` James Seo
2023-04-26 19:35 ` Armin Wolf
2023-04-27 7:37 ` James Seo
2023-04-27 16:39 ` Armin Wolf [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=de4c28c1-6e70-ceb9-484a-143c2b1ebccc@gmx.de \
--to=w_armin@gmx.de \
--cc=james@equiv.tech \
--cc=jdelvare@suse.com \
--cc=linux-hwmon@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@roeck-us.net \
--cc=platform-driver-x86@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).