From: swarren@wwwdotorg.org (Stephen Warren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/3 v4] ARM: bcm2835: Add the Raspberry Pi firmware driver
Date: Thu, 28 May 2015 16:10:24 -0600 [thread overview]
Message-ID: <55679250.1040708@wwwdotorg.org> (raw)
In-Reply-To: <55678BBC.5090507@tronnes.org>
On 05/28/2015 03:42 PM, Noralf Tr?nnes wrote:
>
> Den 28.05.2015 20:33, skrev Eric Anholt:
>> This gives us a function for making mailbox property channel requests
>> of the firmware, which is most notable in that it will let us get and
>> set clock rates.
>> +static int rpi_firmware_remove(struct platform_device *pdev)
>> +{
>> + struct rpi_firmware *fw = platform_get_drvdata(pdev);
>> +
>> + mbox_free_channel(fw->chan);
>
> I guess driver data has to be reset here:
> platform_set_drvdata(pdev, NULL);
The value of the drvdata is irrelevant before the device has probed, or
after it has been removed. Hence, drivers should not manually clear
drvdata. (Many drivers used to, but that code is being purged out).
WARNING: multiple messages have this Message-ID (diff)
From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
To: "Noralf Trønnes" <noralf-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>,
"Eric Anholt" <eric-WhKQ6XTQaPysTnJN9+BGXg@public.gmane.org>
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH 2/3 v4] ARM: bcm2835: Add the Raspberry Pi firmware driver
Date: Thu, 28 May 2015 16:10:24 -0600 [thread overview]
Message-ID: <55679250.1040708@wwwdotorg.org> (raw)
In-Reply-To: <55678BBC.5090507-L59+Z2yzLopAfugRpC6u6w@public.gmane.org>
On 05/28/2015 03:42 PM, Noralf Trønnes wrote:
>
> Den 28.05.2015 20:33, skrev Eric Anholt:
>> This gives us a function for making mailbox property channel requests
>> of the firmware, which is most notable in that it will let us get and
>> set clock rates.
>> +static int rpi_firmware_remove(struct platform_device *pdev)
>> +{
>> + struct rpi_firmware *fw = platform_get_drvdata(pdev);
>> +
>> + mbox_free_channel(fw->chan);
>
> I guess driver data has to be reset here:
> platform_set_drvdata(pdev, NULL);
The value of the drvdata is irrelevant before the device has probed, or
after it has been removed. Hence, drivers should not manually clear
drvdata. (Many drivers used to, but that code is being purged out).
--
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WARNING: multiple messages have this Message-ID (diff)
From: Stephen Warren <swarren@wwwdotorg.org>
To: "Noralf Trønnes" <noralf@tronnes.org>, "Eric Anholt" <eric@anholt.net>
Cc: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-rpi-kernel@lists.infradead.org
Subject: Re: [PATCH 2/3 v4] ARM: bcm2835: Add the Raspberry Pi firmware driver
Date: Thu, 28 May 2015 16:10:24 -0600 [thread overview]
Message-ID: <55679250.1040708@wwwdotorg.org> (raw)
In-Reply-To: <55678BBC.5090507@tronnes.org>
On 05/28/2015 03:42 PM, Noralf Trønnes wrote:
>
> Den 28.05.2015 20:33, skrev Eric Anholt:
>> This gives us a function for making mailbox property channel requests
>> of the firmware, which is most notable in that it will let us get and
>> set clock rates.
>> +static int rpi_firmware_remove(struct platform_device *pdev)
>> +{
>> + struct rpi_firmware *fw = platform_get_drvdata(pdev);
>> +
>> + mbox_free_channel(fw->chan);
>
> I guess driver data has to be reset here:
> platform_set_drvdata(pdev, NULL);
The value of the drvdata is irrelevant before the device has probed, or
after it has been removed. Hence, drivers should not manually clear
drvdata. (Many drivers used to, but that code is being purged out).
next prev parent reply other threads:[~2015-05-28 22:10 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-13 19:00 RPi firmware driver v2 Eric Anholt
2015-05-13 19:00 ` Eric Anholt
2015-05-13 19:00 ` [PATCH 1/3 v2] dt/bindings: Add binding for the Raspberry Pi firmware driver Eric Anholt
2015-05-13 19:00 ` Eric Anholt
2015-05-14 8:40 ` Lee Jones
2015-05-14 8:40 ` Lee Jones
2015-05-14 8:40 ` Lee Jones
2015-05-14 9:57 ` Eric Anholt
2015-05-14 9:57 ` Eric Anholt
2015-05-14 9:57 ` Eric Anholt
2015-05-17 17:11 ` Noralf Trønnes
2015-05-17 17:11 ` Noralf Trønnes
2015-05-18 17:59 ` [PATCH 1/3 v3] " Eric Anholt
2015-05-18 17:59 ` Eric Anholt
2015-05-28 21:12 ` Stephen Warren
2015-05-28 21:12 ` Stephen Warren
2015-05-28 21:12 ` Stephen Warren
2015-05-13 19:00 ` [PATCH 2/3 v2] ARM: bcm2835: Add " Eric Anholt
2015-05-13 19:00 ` Eric Anholt
2015-05-13 19:00 ` Eric Anholt
2015-05-17 17:30 ` Noralf Trønnes
2015-05-17 17:30 ` Noralf Trønnes
2015-05-17 18:26 ` Noralf Trønnes
2015-05-17 18:26 ` Noralf Trønnes
2015-05-17 18:26 ` Noralf Trønnes
2015-05-18 17:34 ` Eric Anholt
2015-05-18 17:34 ` Eric Anholt
2015-05-18 18:00 ` [PATCH 2/3 v3] " Eric Anholt
2015-05-18 18:00 ` Eric Anholt
[not found] ` <20150528112610.GO11677@x1>
2015-05-28 11:45 ` [PATCH 2/3 v2] " Lee Jones
2015-05-28 11:45 ` Lee Jones
2015-05-28 11:45 ` Lee Jones
2015-05-28 18:33 ` [PATCH 2/3 v4] " Eric Anholt
2015-05-28 18:33 ` Eric Anholt
2015-05-28 18:33 ` Eric Anholt
2015-05-28 21:28 ` Stephen Warren
2015-05-28 21:28 ` Stephen Warren
2015-05-28 21:39 ` Noralf Trønnes
2015-05-28 21:39 ` Noralf Trønnes
2015-05-28 21:39 ` Noralf Trønnes
2015-05-28 22:09 ` Stephen Warren
2015-05-28 22:09 ` Stephen Warren
2015-05-28 22:09 ` Stephen Warren
2015-05-28 22:36 ` Eric Anholt
2015-05-28 22:36 ` Eric Anholt
2015-05-28 21:42 ` Noralf Trønnes
2015-05-28 21:42 ` Noralf Trønnes
2015-05-28 22:10 ` Stephen Warren [this message]
2015-05-28 22:10 ` Stephen Warren
2015-05-28 22:10 ` Stephen Warren
2015-05-28 22:38 ` Eric Anholt
2015-05-28 22:38 ` Eric Anholt
2015-05-28 22:38 ` Eric Anholt
2015-05-28 22:43 ` Noralf Trønnes
2015-05-28 22:43 ` Noralf Trønnes
2015-05-28 22:43 ` Noralf Trønnes
2015-05-28 21:17 ` [PATCH 2/3 v2] " Stephen Warren
2015-05-28 21:17 ` Stephen Warren
2015-05-28 21:17 ` Stephen Warren
2015-05-28 22:40 ` Noralf Trønnes
2015-05-28 22:40 ` Noralf Trønnes
2015-05-28 22:40 ` Noralf Trønnes
2015-05-13 19:00 ` [PATCH 3/3 v2] ARM: bcm2835: Add the firmware driver information to the RPi DT Eric Anholt
2015-05-13 19:00 ` Eric Anholt
2015-05-28 21:29 ` Stephen Warren
2015-05-28 21:29 ` Stephen Warren
2015-05-28 21:29 ` Stephen Warren
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