From: Leonard Crestez <leonard.crestez@nxp.com>
To: "myungjoo.ham@samsung.com" <myungjoo.ham@samsung.com>,
Kyungmin Park <kyungmin.park@samsung.com>,
Matthias Kaehlcke <mka@chromium.org>
Cc: Abel Vesa <abel.vesa@nxp.com>,
Saravana Kannan <saravanak@google.com>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Artur Swigon <a.swigon@samsung.com>,
Krzysztof Kozlowski <krzk@kernel.org>,
Lukasz Luba <l.luba@partner.samsung.com>,
Chanwoo Choi <cw00.choi@samsung.com>,
Alexandre Bailon <abailon@baylibre.com>,
dl-linux-imx <linux-imx@nxp.com>,
Georgi Djakov <georgi.djakov@linaro.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Jacky Bai <ping.bai@nxp.com>
Subject: Re: [PATCH v8 2/6] PM / devfreq: Move more initialization before registration
Date: Wed, 25 Sep 2019 19:33:19 +0000 [thread overview]
Message-ID: <VI1PR04MB7023CF68F6B393E6FB2DE206EE870@VI1PR04MB7023.eurprd04.prod.outlook.com> (raw)
In-Reply-To: 20190925015845epcms1p4f788aa587e53bfa38b9b847838b02342@epcms1p4
On 25.09.2019 04:59, MyungJoo Ham wrote:
>> In general it is a better to initialize an object before making it
>> accessible externally (through device_register).
>>
>> This makes it possible to avoid relying on locking a partially
>> initialized object.
>>
>> Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
>> Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
>
> Do you object to the general idea of devm_* for device drivers?
> or did you find a bug in the memory handling in the code?
>
> The result of this commit still relies on locking anyway.
This is a dependency of the following patch which removes the locking. I
will add this to the commit message because everybody asks.
This patch removes devm because devm itself is only available after
device_initialize. Moving the allocation ahead of device_register (which
calls device_initialize) requires switching to manual memory management.
Since there are only two pointers it seemed reasonable.
Alternatively device_register could be split into explicit
"device_initialize" and "device_add" steps and devm could be used
between those steps.
Before:
- device_register
- devm-based-alloc
After:
+ device_initialize
+ devm-based-alloc
+ device_add
Does this make sense?
--
Regards,
Leonard
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prev parent reply other threads:[~2019-09-25 19:33 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20190924101140epcas1p4abeedf42f223e65f58c88a0ddf1e4e56@epcas1p4.samsung.com>
2019-09-24 10:11 ` [PATCH v8 0/6] PM / devfreq: Add dev_pm_qos support Leonard Crestez
2019-09-24 10:11 ` [PATCH v8 1/6] PM / devfreq: Don't fail devfreq_dev_release if not in list Leonard Crestez
2019-09-24 10:11 ` [PATCH v8 2/6] PM / devfreq: Move more initialization before registration Leonard Crestez
2019-09-25 1:46 ` Chanwoo Choi
2019-09-24 10:11 ` [PATCH v8 3/6] PM / devfreq: Don't take lock in devfreq_add_device Leonard Crestez
2019-09-24 10:11 ` [PATCH v8 4/6] PM / devfreq: Introduce get_freq_range helper Leonard Crestez
2019-09-25 1:37 ` Chanwoo Choi
2019-09-25 20:55 ` Leonard Crestez
2019-09-26 1:06 ` Chanwoo Choi
2019-09-26 14:03 ` Leonard Crestez
2019-09-24 10:11 ` [PATCH v8 5/6] PM / devfreq: Add PM QoS support Leonard Crestez
2019-09-24 19:11 ` Matthias Kaehlcke
2019-09-24 19:22 ` Leonard Crestez
2019-09-25 2:17 ` Chanwoo Choi
2019-09-25 19:40 ` Leonard Crestez
2019-09-26 1:08 ` Chanwoo Choi
2019-09-25 2:15 ` Chanwoo Choi
2019-09-25 16:06 ` Matthias Kaehlcke
2019-09-25 21:18 ` Leonard Crestez
2019-09-26 1:12 ` Chanwoo Choi
2019-09-26 13:43 ` Leonard Crestez
2019-09-27 1:49 ` Chanwoo Choi
2019-09-30 13:16 ` Leonard Crestez
2019-09-30 21:42 ` Chanwoo Choi
2019-10-01 9:39 ` Leonard Crestez
2019-10-01 21:55 ` Chanwoo Choi
2019-09-26 1:19 ` Chanwoo Choi
2019-09-30 12:43 ` Leonard Crestez
2019-09-30 21:21 ` Chanwoo Choi
2019-09-24 10:11 ` [PATCH v8 6/6] PM / devfreq: Use PM QoS for sysfs min/max_freq Leonard Crestez
2019-09-25 2:41 ` Chanwoo Choi
2019-09-25 16:45 ` Matthias Kaehlcke
2019-09-26 1:25 ` Chanwoo Choi
2019-09-26 16:04 ` Matthias Kaehlcke
2019-09-27 1:58 ` Chanwoo Choi
2019-09-25 22:11 ` Leonard Crestez
2019-09-26 1:26 ` Chanwoo Choi
2019-09-25 1:44 ` [PATCH v8 0/6] PM / devfreq: Add dev_pm_qos support Chanwoo Choi
2019-09-25 19:37 ` Leonard Crestez
[not found] ` <CGME20190924101139epcas1p4c6799a5de9bdb4e90abb74de1e881388@epcms1p4>
2019-09-25 1:58 ` [PATCH v8 2/6] PM / devfreq: Move more initialization before registration MyungJoo Ham
2019-09-25 19:33 ` Leonard Crestez [this message]
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