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SubjectRe: [PATCH v9 06/17] platform/x86: wmi: Don't allow drivers to get each other's GUIDs
On Tuesday 17 October 2017 13:21:50 Mario Limonciello wrote:
> The only driver using this was dell-wmi, and it really was a hack.
> The driver was getting a data attribute from another driver and this
> type of action should not be encouraged.
>
> Rather drivers that need to interact with one another should pass
> data back and forth via exported functions.
>
> Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
> Reviewed-by: Edward O'Callaghan <quasisec@google.com>

Reviewed-by: Pali Rohár <pali.rohar@gmail.com>

> ---
> drivers/platform/x86/wmi.c | 17 -----------------
> include/linux/wmi.h | 4 ----
> 2 files changed, 21 deletions(-)
>
> diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
> index 4d73a87c2ddf..bcb41c1c7f52 100644
> --- a/drivers/platform/x86/wmi.c
> +++ b/drivers/platform/x86/wmi.c
> @@ -368,23 +368,6 @@ union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance)
> }
> EXPORT_SYMBOL_GPL(wmidev_block_query);
>
> -struct wmi_device *wmidev_get_other_guid(struct wmi_device *wdev,
> - const char *guid_string)
> -{
> - struct wmi_block *this_wb = container_of(wdev, struct wmi_block, dev);
> - struct wmi_block *other_wb;
> -
> - if (!find_guid(guid_string, &other_wb))
> - return NULL;
> -
> - if (other_wb->acpi_device != this_wb->acpi_device)
> - return NULL;
> -
> - get_device(&other_wb->dev.dev);
> - return &other_wb->dev;
> -}
> -EXPORT_SYMBOL_GPL(wmidev_get_other_guid);
> -
> /**
> * wmi_set_block - Write to a WMI block
> * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
> diff --git a/include/linux/wmi.h b/include/linux/wmi.h
> index 2cd10c3b89e9..ddee427e0721 100644
> --- a/include/linux/wmi.h
> +++ b/include/linux/wmi.h
> @@ -36,10 +36,6 @@ extern acpi_status wmidev_evaluate_method(struct wmi_device *wdev,
> extern union acpi_object *wmidev_block_query(struct wmi_device *wdev,
> u8 instance);
>
> -/* Gets another device on the same bus. Caller must put_device the result. */
> -extern struct wmi_device *wmidev_get_other_guid(struct wmi_device *wdev,
> - const char *guid_string);
> -
> struct wmi_device_id {
> const char *guid_string;
> };

--
Pali Rohár
pali.rohar@gmail.com

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