Noralf Trønnes <noralf@xxxxxxxxxxx> 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@xxxxxxxxxx> > ... >> +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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