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From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: Zhang Rui <rui.zhang@intel.com>,
	Andrzej Pietrasiewicz <andrzej.p@collabora.com>,
	linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org,
	netdev@vger.kernel.org, linux-wireless@vger.kernel.org,
	platform-driver-x86@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-renesas-soc@vger.kernel.org,
	linux-rockchip@lists.infradead.org
Cc: "Rafael J . Wysocki" <rjw@rjwysocki.net>,
	"Len Brown" <lenb@kernel.org>,
	"Vishal Kulkarni" <vishal@chelsio.com>,
	"David S . Miller" <davem@davemloft.net>,
	"Jiri Pirko" <jiri@mellanox.com>,
	"Ido Schimmel" <idosch@mellanox.com>,
	"Johannes Berg" <johannes.berg@intel.com>,
	"Emmanuel Grumbach" <emmanuel.grumbach@intel.com>,
	"Luca Coelho" <luciano.coelho@intel.com>,
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	"Sebastian Reichel" <sre@kernel.org>,
	"Miquel Raynal" <miquel.raynal@bootlin.com>,
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	"Shawn Guo" <shawnguo@kernel.org>,
	"Sascha Hauer" <s.hauer@pengutronix.de>,
	"Pengutronix Kernel Team" <kernel@pengutronix.de>,
	"Fabio Estevam" <festevam@gmail.com>,
	"NXP Linux Team" <linux-imx@nxp.com>,
	"Niklas Söderlund" <niklas.soderlund@ragnatech.se>,
	"Heiko Stuebner" <heiko@sntech.de>,
	"Orson Zhai" <orsonzhai@gmail.com>,
	"Baolin Wang" <baolin.wang7@gmail.com>,
	"Chunyan Zhang" <zhang.lyra@gmail.com>,
	"Allison Randal" <allison@lohutok.net>,
	"Enrico Weigelt" <info@metux.net>,
	"Gayatri Kammela" <gayatri.kammela@intel.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Bartlomiej Zolnierkiewicz" <b.zolnierkie@samsung.com>,
	kernel@collabora.com
Subject: Re: [PATCH v7 00/11] Stop monitoring disabled devices
Date: Fri, 3 Jul 2020 08:38:48 +0200
Message-ID: <58265668-fc6d-729a-c126-0c73c2ea853b@linaro.org> (raw)
In-Reply-To: <44c622dd7de8c7bf143c4435c0edd1b98d09a3d6.camel@intel.com>

On 03/07/2020 03:49, Zhang Rui wrote:
> On Thu, 2020-07-02 at 19:49 +0200, Daniel Lezcano wrote:

[ ... ]

>>> So the reason is that ->get_temp() is called while the mutex is
>>> held and
>>> thermal_zone_device_is_enabled() wants to take the same mutex.
>>
>> Yes, that's correct.
>>
>>> Is adding a comment to thermal_zone_device_is_enabled() to never
>>> call
>>> it while the mutex is held and adding another version of it which
>>> does
>>> not take the mutex ok?
>>
>> The thermal_zone_device_is_enabled() is only used in two places, acpi
>> and this imx driver, and given:
>>
>> 1. as soon as the mutex is released, there is no guarantee the
>> thermal
>> zone won't be changed right after, the lock is pointless, thus the
>> information also.
>>
>> 2. from a design point of view, I don't see why a driver should know
>> if
>> a thermal zone is disabled or not
>>
>> It would make sense to end with this function and do not give the
>> different drivers an opportunity to access this information.
> 
> I agree.
>>
>> Why not add change_mode for the acpi in order to enable or disable
>> the
>> events
> 
> thermal_zone_device_is_enabled() is invoked in acpi thermal driver
> because we only want to do thermal_zone_device_update() when the acpi
> thermal zone is enabled.
> 
> As thermal_zone_device_update() can handle a disabled thermal zone now,
> we can just remove the check.

Ah yes, good point!



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  reply index

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-29 12:29 Andrzej Pietrasiewicz
2020-06-29 12:29 ` [PATCH v7 01/11] acpi: thermal: Fix error handling in the register function Andrzej Pietrasiewicz
2020-06-29 12:29 ` [PATCH v7 02/11] thermal: Store thermal mode in a dedicated enum Andrzej Pietrasiewicz
2020-06-29 12:29 ` [PATCH v7 03/11] thermal: Add current mode to thermal zone device Andrzej Pietrasiewicz
2020-06-29 12:29 ` [PATCH v7 04/11] thermal: Store device mode in struct thermal_zone_device Andrzej Pietrasiewicz
2020-06-29 12:29 ` [PATCH v7 05/11] thermal: remove get_mode() operation of drivers Andrzej Pietrasiewicz
2020-06-29 12:29 ` [PATCH v7 06/11] thermal: Add mode helpers Andrzej Pietrasiewicz
2020-06-29 12:29 ` [PATCH v7 07/11] thermal: Use mode helpers in drivers Andrzej Pietrasiewicz
2020-06-29 12:45   ` Amit Kucheria
2020-06-29 14:14   ` Bartlomiej Zolnierkiewicz
2020-06-29 12:29 ` [PATCH v7 08/11] thermal: Explicitly enable non-changing thermal zone devices Andrzej Pietrasiewicz
2020-06-29 14:15   ` Bartlomiej Zolnierkiewicz
2020-06-30  5:07   ` Amit Kucheria
2020-06-29 12:29 ` [PATCH v7 09/11] thermal: core: Stop polling DISABLED thermal devices Andrzej Pietrasiewicz
2020-06-29 12:46   ` Amit Kucheria
2020-06-29 12:29 ` [PATCH v7 10/11] thermal: Simplify or eliminate unnecessary set_mode() methods Andrzej Pietrasiewicz
2020-06-29 12:47   ` Amit Kucheria
2020-06-29 12:29 ` [PATCH v7 11/11] thermal: Rename set_mode() to change_mode() Andrzej Pietrasiewicz
2020-06-29 12:48   ` Amit Kucheria
2020-06-30 12:57 ` [PATCH v7 00/11] Stop monitoring disabled devices Daniel Lezcano
2020-06-30 13:43   ` Andrzej Pietrasiewicz
2020-06-30 14:53     ` Daniel Lezcano
2020-06-30 15:29       ` Andrzej Pietrasiewicz
2020-06-30 15:53         ` Daniel Lezcano
2020-06-30 16:56           ` Andrzej Pietrasiewicz
2020-06-30 18:33             ` Daniel Lezcano
2020-07-01 10:23               ` Andrzej Pietrasiewicz
2020-07-01 14:25                 ` Daniel Lezcano
2020-07-02 13:47                 ` Daniel Lezcano
2020-07-02 13:53                   ` Andrzej Pietrasiewicz
2020-07-02 14:58                     ` Daniel Lezcano
2020-07-02 17:01                     ` Daniel Lezcano
2020-07-02 17:19                       ` Andrzej Pietrasiewicz
2020-07-02 17:49                         ` Daniel Lezcano
2020-07-02 17:52                           ` Daniel Lezcano
2020-07-03  1:49                           ` Zhang Rui
2020-07-03  6:38                             ` Daniel Lezcano [this message]
2020-07-03 10:45                               ` Andrzej Pietrasiewicz
2020-07-03 11:05                                 ` Daniel Lezcano

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