On Friday 20 October 2017 12:40:20 Mario Limonciello wrote:
> diff --git a/drivers/platform/x86/dell-wmi-descriptor.c
> b/drivers/platform/x86/dell-wmi-descriptor.c
> new file mode 100644
> index 000000000000..3204c408e261
> --- /dev/null
> +++ b/drivers/platform/x86/dell-wmi-descriptor.c
This dell-wmi-descriptor.c looks good now!
> diff --git a/drivers/platform/x86/dell-wmi-descriptor.h
> b/drivers/platform/x86/dell-wmi-descriptor.h
> new file mode 100644
> index 000000000000..5f7b69c2c83a
> --- /dev/null
> +++ b/drivers/platform/x86/dell-wmi-descriptor.h
> @@ -721,7 +652,9 @@ static int dell_wmi_events_set_enabled(bool enable)
> static int dell_wmi_probe(struct wmi_device *wdev)
> {
> struct dell_wmi_priv *priv;
> - int err;
> +
> + if (!wmi_has_guid(DELL_WMI_DESCRIPTOR_GUID))
> + return -ENODEV;
>
> priv = devm_kzalloc(
> &wdev->dev, sizeof(struct dell_wmi_priv), GFP_KERNEL);
> @@ -729,9 +662,8 @@ static int dell_wmi_probe(struct wmi_device *wdev)
> return -ENOMEM;
> dev_set_drvdata(&wdev->dev, priv);
>
> - err = dell_wmi_check_descriptor_buffer(wdev);
> - if (err)
> - return err;
> + if (!dell_wmi_get_interface_version(&priv->interface_version))
> + return -EPROBE_DEFER;
But here is still a problem. You added check that
DELL_WMI_DESCRIPTOR_GUID exists in APCI table, but it does not mean that
probe method of dell-wmi-descriptor cannot fail.
With PROBE_DEFER, dell_wmi_probe function would be called later again
and again, even when probing dell-wmi-descriptor failed and so dell-wmi
in this case cannot work.
> return dell_wmi_input_setup(wdev);
> }
--
Pali Rohár
pali.ro...@gmail.com
