linux-kernel - Re: [PATCH 2/3 v4] ARM: bcm2835: Add the Raspberry Pi firmware driver

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Date:	Fri, 29 May 2015 00:43:46 +0200
From:	Noralf Trønnes <noralf@...nnes.org>
To:	Eric Anholt <eric@...olt.net>, linux-arm-kernel@...ts.infradead.org
CC:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3 v4] ARM: bcm2835: Add the Raspberry Pi firmware driver



Den 29.05.2015 00:38, skrev Eric Anholt:
> Noralf Trønnes <noralf@...nnes.org> writes:
>
>> 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.
>>>
>>> Signed-off-by: Eric Anholt <eric@...olt.net>
>> ...
>>> +static int rpi_firmware_probe(struct platform_device *pdev)
>>> +{
>>> +	struct device *dev = &pdev->dev;
>>> +	struct rpi_firmware *fw;
>>> +
>>> +	fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL);
>>> +	if (!fw)
>>> +		return -ENOMEM;
>>> +
>>> +	fw->cl.dev = dev;
>>> +	fw->cl.rx_callback = response_callback;
>>> +	fw->cl.tx_block = true;
>>> +
>>> +	fw->chan = mbox_request_channel(&fw->cl, 0);
>>> +	if (IS_ERR(fw->chan)) {
>>> +		int ret = PTR_ERR(fw->chan);
>>> +		if (ret != -EPROBE_DEFER)
>>> +			dev_err(dev, "Failed to get mbox channel: %d\n", ret);
>>> +		return ret;
>>> +	}
>>> +
>>> +	init_completion(&fw->c);
>>> +
>>> +	platform_set_drvdata(pdev, fw);
>>> +
>>> +	rpi_firmware_print_firmware_revision(dev);
>>> +
>>> +	return 0;
>>> +}
>>> +
>>> +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);
> Fixed.
>

I was wrong about this one as Stephen pointed out.
My point became mute now that rpi_firmware_property_list() doesn't look 
up driver data anymore.

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