All of lore.kernel.org
 help / color / mirror / Atom feed
From: Lukasz Luba <lukasz.luba@arm.com>
To: Ionela Voinescu <ionela.voinescu@arm.com>
Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
	dri-devel@lists.freedesktop.org, rui.zhang@intel.com,
	amit.kucheria@verdurent.com, daniel.lezcano@linaro.org,
	orjan.eide@arm.com, robh@kernel.org,
	alyssa.rosenzweig@collabora.com, steven.price@arm.com,
	airlied@linux.ie, daniel@ffwll.ch
Subject: Re: [PATCH v2 3/5] thermal: devfreq_cooling: add new registration functions with Energy Model
Date: Wed, 2 Dec 2020 11:54:00 +0000	[thread overview]
Message-ID: <a152499a-e486-10b6-3f69-cc3704807767@arm.com> (raw)
In-Reply-To: <20201202114909.GA1198@arm.com>



On 12/2/20 11:49 AM, Ionela Voinescu wrote:
> On Wednesday 02 Dec 2020 at 11:14:02 (+0000), Lukasz Luba wrote:
>> Hi Ionela,
>>
>> On 12/2/20 10:24 AM, Ionela Voinescu wrote:
>>> Hi Lukasz,
>>>
>>> On Wednesday 18 Nov 2020 at 12:03:56 (+0000), Lukasz Luba wrote:
>>
>> [snip]
>>
>>>> +	struct device_node *np = NULL;
>>
>> [snip]
>>
>>>> +
>>>> +	if (dev->of_node)
>>>> +		np = of_node_get(dev->of_node);
>>>> +
>>>
>>> Should np be checked before use? I'm not sure if it's better to do the
>>> assign first and then the check on np before use. It depends on the
>>> consequences of passing a NULL node pointer later on.
>>
>> The np is actually dev->of_node (or left NULL, as set at the begging).
>> The only meaning of the line above is to increment the counter and then
>> decrement if CONFIG_OF_DYNAMIC was used.
>> The devfreq_cooling_register() has np = NULL and the registration can
>> handle it, so we should be OK here as well.
>>
> 
> Yes, I just wanted to make sure later registration can handle np = NULL,
> or whether we need to bail out.
> 
> In this case, you can drop both ifs - for (dev->of_node) before get and
> for np before put below, as of_node_get/of_node_put can handle NULL
> pointers themselves.

Right. I agree, I will resend this patch with that small change.
Thank you for having a look at it.

Lukasz

> 
> Thanks,
> Ionela.
> 

WARNING: multiple messages have this Message-ID (diff)
From: Lukasz Luba <lukasz.luba@arm.com>
To: Ionela Voinescu <ionela.voinescu@arm.com>
Cc: amit.kucheria@verdurent.com, linux-pm@vger.kernel.org,
	airlied@linux.ie, daniel.lezcano@linaro.org,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	steven.price@arm.com, alyssa.rosenzweig@collabora.com,
	rui.zhang@intel.com, orjan.eide@arm.com
Subject: Re: [PATCH v2 3/5] thermal: devfreq_cooling: add new registration functions with Energy Model
Date: Wed, 2 Dec 2020 11:54:00 +0000	[thread overview]
Message-ID: <a152499a-e486-10b6-3f69-cc3704807767@arm.com> (raw)
In-Reply-To: <20201202114909.GA1198@arm.com>



On 12/2/20 11:49 AM, Ionela Voinescu wrote:
> On Wednesday 02 Dec 2020 at 11:14:02 (+0000), Lukasz Luba wrote:
>> Hi Ionela,
>>
>> On 12/2/20 10:24 AM, Ionela Voinescu wrote:
>>> Hi Lukasz,
>>>
>>> On Wednesday 18 Nov 2020 at 12:03:56 (+0000), Lukasz Luba wrote:
>>
>> [snip]
>>
>>>> +	struct device_node *np = NULL;
>>
>> [snip]
>>
>>>> +
>>>> +	if (dev->of_node)
>>>> +		np = of_node_get(dev->of_node);
>>>> +
>>>
>>> Should np be checked before use? I'm not sure if it's better to do the
>>> assign first and then the check on np before use. It depends on the
>>> consequences of passing a NULL node pointer later on.
>>
>> The np is actually dev->of_node (or left NULL, as set at the begging).
>> The only meaning of the line above is to increment the counter and then
>> decrement if CONFIG_OF_DYNAMIC was used.
>> The devfreq_cooling_register() has np = NULL and the registration can
>> handle it, so we should be OK here as well.
>>
> 
> Yes, I just wanted to make sure later registration can handle np = NULL,
> or whether we need to bail out.
> 
> In this case, you can drop both ifs - for (dev->of_node) before get and
> for np before put below, as of_node_get/of_node_put can handle NULL
> pointers themselves.

Right. I agree, I will resend this patch with that small change.
Thank you for having a look at it.

Lukasz

> 
> Thanks,
> Ionela.
> 
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  reply	other threads:[~2020-12-02 11:54 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-18 12:03 [PATCH v2 0/5] Thermal devfreq cooling improvements with Energy Model Lukasz Luba
2020-11-18 12:03 ` Lukasz Luba
2020-11-18 12:03 ` [PATCH v2 1/5] thermal: devfreq_cooling: change tracing function and arguments Lukasz Luba
2020-11-18 12:03   ` Lukasz Luba
2020-12-02 10:23   ` Ionela Voinescu
2020-12-02 10:23     ` Ionela Voinescu
2020-11-18 12:03 ` [PATCH v2 2/5] thermal: devfreq_cooling: get a copy of device status Lukasz Luba
2020-11-18 12:03   ` Lukasz Luba
2020-12-02 10:23   ` Ionela Voinescu
2020-12-02 10:23     ` Ionela Voinescu
2020-12-03 13:09   ` Daniel Lezcano
2020-12-03 13:09     ` Daniel Lezcano
2020-12-03 15:38     ` Lukasz Luba
2020-12-03 15:38       ` Lukasz Luba
2020-12-03 16:09       ` Daniel Lezcano
2020-12-03 16:09         ` Daniel Lezcano
2020-12-07 12:41         ` Lukasz Luba
2020-12-07 12:41           ` Lukasz Luba
2020-12-08 14:20           ` Lukasz Luba
2020-12-08 14:20             ` Lukasz Luba
2020-11-18 12:03 ` [PATCH v2 3/5] thermal: devfreq_cooling: add new registration functions with Energy Model Lukasz Luba
2020-11-18 12:03   ` Lukasz Luba
2020-12-02 10:24   ` Ionela Voinescu
2020-12-02 10:24     ` Ionela Voinescu
2020-12-02 11:14     ` Lukasz Luba
2020-12-02 11:14       ` Lukasz Luba
2020-12-02 11:49       ` Ionela Voinescu
2020-12-02 11:49         ` Ionela Voinescu
2020-12-02 11:54         ` Lukasz Luba [this message]
2020-12-02 11:54           ` Lukasz Luba
2020-12-03 15:40   ` Daniel Lezcano
2020-12-03 15:40     ` Daniel Lezcano
2020-12-07  9:46     ` Lukasz Luba
2020-12-07  9:46       ` Lukasz Luba
2020-11-18 12:03 ` [PATCH v2 4/5] thermal: devfreq_cooling: remove old power model and use EM Lukasz Luba
2020-11-18 12:03   ` Lukasz Luba
2020-12-02 10:26   ` Ionela Voinescu
2020-12-02 10:26     ` Ionela Voinescu
2020-11-18 12:03 ` [PATCH v2 5/5] drm/panfrost: Register devfreq cooling and attempt to add Energy Model Lukasz Luba
2020-11-18 12:03   ` Lukasz Luba
2020-12-02 15:01 ` [PATCH v2 0/5] Thermal devfreq cooling improvements with " Daniel Lezcano
2020-12-02 15:01   ` Daniel Lezcano

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=a152499a-e486-10b6-3f69-cc3704807767@arm.com \
    --to=lukasz.luba@arm.com \
    --cc=airlied@linux.ie \
    --cc=alyssa.rosenzweig@collabora.com \
    --cc=amit.kucheria@verdurent.com \
    --cc=daniel.lezcano@linaro.org \
    --cc=daniel@ffwll.ch \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=ionela.voinescu@arm.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=orjan.eide@arm.com \
    --cc=robh@kernel.org \
    --cc=rui.zhang@intel.com \
    --cc=steven.price@arm.com \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.