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From: "Pali Rohár" <pali@kernel.org>
To: Lyndon Sanche <lsanche@lyndeno.ca>
Cc: "Matthew Garrett" <mjg59@srcf.ucam.org>,
	"Hans de Goede" <hdegoede@redhat.com>,
	"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
	platform-driver-x86@vger.kernel.org,
	linux-kernel@vger.kernel.org, Dell.Client.Kernel@dell.com
Subject: Re: [PATCH] platform/x86: dell-laptop: Implement platform_profile
Date: Thu, 25 Apr 2024 22:31:13 +0200	[thread overview]
Message-ID: <20240425203113.eokpgdjj6hmxhdj3@pali> (raw)
In-Reply-To: <d31486b6-d71d-4985-adb1-2425f19b0b5c@app.fastmail.com>

On Thursday 25 April 2024 14:27:32 Lyndon Sanche wrote:
> On Thu, Apr 25, 2024, at 2:12 PM, Pali Rohár wrote:
> > On Thursday 25 April 2024 11:27:57 Lyndon Sanche wrote:
> >> +int thermal_init(void)
> >> +{
> >> +	int ret;
> >> +	int supported_modes;
> >> +
> >> +	ret = thermal_get_supported_modes(&supported_modes);
> >> +
> >> +	if (ret != 0 || supported_modes == 0)
> >> +		return -ENXIO;
> >> +
> >> +	thermal_handler = kzalloc(sizeof(*thermal_handler), GFP_KERNEL);
> >> +	if (!thermal_handler)
> >> +		return -ENOMEM;
> >> +	thermal_handler->profile_get = thermal_platform_profile_get;
> >> +	thermal_handler->profile_set = thermal_platform_profile_set;
> >> +
> >> +	if ((supported_modes >> DELL_QUIET) & 1)
> >> +		set_bit(PLATFORM_PROFILE_QUIET, thermal_handler->choices);
> >> +	if ((supported_modes >> DELL_COOL_BOTTOM) & 1)
> >> +		set_bit(PLATFORM_PROFILE_COOL, thermal_handler->choices);
> >> +	if ((supported_modes >> DELL_BALANCED) & 1)
> >> +		set_bit(PLATFORM_PROFILE_BALANCED, thermal_handler->choices);
> >> +	if ((supported_modes >> DELL_PERFORMANCE) & 1)
> >> +		set_bit(PLATFORM_PROFILE_PERFORMANCE, thermal_handler->choices);
> >> +
> >> +	platform_profile_register(thermal_handler);
> >> +
> >> +	return 0;
> >> +}
> >> +
> >> +void thermal_cleanup(void)
> >> +{
> >> +	platform_profile_remove();
> >> +	kfree(thermal_handler);
> >> +}
> >> +
> >>  static struct led_classdev mute_led_cdev = {
> >>  	.name = "platform::mute",
> >>  	.max_brightness = 1,
> >> @@ -2266,6 +2480,11 @@ static int __init dell_init(void)
> >>  		mute_led_registered = true;
> >>  	}
> >>  
> >> +	// Do not fail module if thermal modes not supported,
> >> +	// just skip
> >> +	if (thermal_init() != 0)
> >> +		pr_warn("Unable to setup platform_profile, skipping");
> >
> > I think that -ENOMEM error should be failure of the loading the driver.
> > It does not make sense to continue of memory allocation failed.
> >
> > On the other hand when the thermal modes are not support (e.g. old
> > Latitude models) then there should not be a warning message. It is
> > expected that on systems without thermal modes the setup fails.
> 
> Thank you for your feedback.
> 
> I agree with your suggestion. -ENOMEM would indicate something bigger is amiss. I can add a check:
> 
> If -ENOMEM, fail driver.
> If anything other error, skip, but do not show a message.
> 
> Lyndon

Maybe you can simplify it more. thermal_init() could return 0 also for
the case when thermal modes are not supported. And dell_init() then can
unconditionally fail when thermal_init() returns non-zero value. It has
benefit that in case thermal_init() is extended in future for some other
fatal error, it would not be required to update also caller to handle
another error (and not just ENOMEM).

  reply	other threads:[~2024-04-25 20:31 UTC|newest]

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-25 17:27 [PATCH] platform/x86: dell-laptop: Implement platform_profile Lyndon Sanche
2024-04-25 20:07 ` Mario Limonciello
2024-04-25 20:24   ` Lyndon Sanche
2024-04-25 20:28     ` Mario Limonciello
2024-04-25 21:51       ` Srinivas Pandruvada
2024-04-26  0:38         ` Lyndon Sanche
2024-04-26 16:14     ` srinivas pandruvada
2024-04-26 18:23       ` Lyndon Sanche
2024-04-26 18:24         ` srinivas pandruvada
2024-04-25 20:12 ` Pali Rohár
2024-04-25 20:27   ` Lyndon Sanche
2024-04-25 20:31     ` Pali Rohár [this message]
2024-04-25 21:07 ` Armin Wolf
2024-04-26  0:54   ` Lyndon Sanche
2024-04-26  2:04 ` [PATCH v2] " Lyndon Sanche
2024-04-26  9:23   ` Ilpo Järvinen
2024-04-26 18:05     ` Lyndon Sanche
2024-05-13 20:09   ` kernel test robot
2024-04-26  6:57 ` [PATCH] " Ilpo Järvinen
2024-04-29 16:48 ` [PATCH v3] " Lyndon Sanche
2024-04-29 17:45   ` Mario Limonciello
2024-04-29 17:51     ` Mario Limonciello
2024-04-29 21:25       ` Lyndon Sanche
2024-04-29 21:21     ` Lyndon Sanche
2024-04-30 10:31   ` Ilpo Järvinen
2024-04-30 18:38     ` Lyndon Sanche
2024-04-30 15:36   ` kernel test robot
2024-05-01  8:16   ` kernel test robot
2024-05-01 16:35   ` kernel test robot
2024-05-01 17:07   ` kernel test robot
2024-05-01  1:14 ` [PATCH v4] " Lyndon Sanche
2024-05-01  1:36   ` Pali Rohár
2024-05-01  1:42     ` Lyndon Sanche
2024-05-01 21:58 ` [PATCH v5] " Lyndon Sanche
2024-05-03 10:19   ` kernel test robot
2024-05-04  1:03     ` Lyndon Sanche
2024-05-06 10:18       ` Hans de Goede
2024-05-07 16:00         ` Lyndon Sanche
2024-05-03 21:19   ` Armin Wolf
2024-05-04  0:59     ` Lyndon Sanche
2024-05-08 14:24   ` Shen, Yijun
2024-05-08 15:53     ` Mario Limonciello
2024-05-11 15:05       ` Shen, Yijun
2024-05-11 15:12         ` Limonciello, Mario
2024-05-11 15:56           ` Shen, Yijun
2024-05-12 17:53             ` Armin Wolf
2024-05-12 17:58               ` Limonciello, Mario
2024-05-12 18:47                 ` Armin Wolf
2024-05-12 22:14                   ` Limonciello, Mario
2024-05-11 16:02         ` Lyndon Sanche
2024-05-09 15:10     ` Lyndon Sanche
2024-05-11  1:49       ` Lyndon Sanche
2024-05-11 15:22         ` Shen, Yijun
2024-05-11 15:54           ` Lyndon Sanche
2024-05-11 16:12             ` Shen, Yijun
2024-05-11  2:36 ` [PATCH v6 0/2] " Lyndon Sanche
2024-05-11  2:36 ` [PATCH v6 1/2] platform/x86: dell-smbios: Add helper for checking supported commands Lyndon Sanche
2024-05-11 15:13   ` Limonciello, Mario
2024-05-12 18:00   ` Armin Wolf
2024-05-11  2:36 ` [PATCH v6 2/2] platform/x86: dell-laptop: Implement platform_profile Lyndon Sanche
2024-05-11 15:16   ` Limonciello, Mario
2024-05-11 15:59     ` Lyndon Sanche
     [not found]       ` <48JCDS.E4RT1F9DTKFU1@lyndeno.ca>
2024-05-12  1:43         ` Limonciello, Mario
2024-05-12 15:25           ` Hans de Goede
2024-05-12  0:14     ` Lyndon Sanche
2024-05-12 18:05   ` Armin Wolf
2024-05-15 17:06     ` Lyndon Sanche
2024-05-17 22:42 ` [PATCH v7 0/3] platform/x86: dell: " Lyndon Sanche
2024-05-17 22:42   ` [PATCH v7 1/3] platform/x86: dell-smbios: Add helper for checking supported class Lyndon Sanche
2024-05-17 22:42   ` [PATCH v7 2/3] platform/x86: dell-smbios: Move request functions for reuse Lyndon Sanche
2024-05-17 22:42   ` [PATCH v7 3/3] platform/x86: dell-pc: Implement platform_profile Lyndon Sanche
2024-05-27  9:39     ` Ilpo Järvinen
2024-05-28 16:16       ` Lyndon Sanche
2024-05-21 20:50   ` [PATCH v7 0/3] platform/x86: dell: " Mario Limonciello
2024-05-29 17:47 ` [PATCH v8 " Lyndon Sanche
2024-05-29 17:47   ` [PATCH v8 1/3] platform/x86: dell-smbios: Add helper for checking supported class Lyndon Sanche
2024-05-29 17:47   ` [PATCH v8 2/3] platform/x86: dell-smbios: Move request functions for reuse Lyndon Sanche
2024-05-29 17:47   ` [PATCH v8 3/3] platform/x86: dell-pc: Implement platform_profile Lyndon Sanche
2024-05-30  8:39     ` Ilpo Järvinen
2024-05-31  1:19       ` Lyndon Sanche

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