Noralf Trønnes <nor...@tronnes.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 <e...@anholt.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.
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