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SubjectRe: [PATCH v3 3/8] platform/x86: dell-wmi-smbios: Use Dell WMI descriptor check
On Wed, Sep 27, 2017 at 11:02:15PM -0500, Mario Limonciello wrote:
> The Dell WMI descriptor check is used as an indication that WMI
> calls are safe to run both when used with the notification
> ASL/GUID pair as well as the SMBIOS calling ASL/GUID pair.
>
> As some code in dell-wmi-smbios is already a prerequisite for
> dell-wmi, move the code for performing the descriptor check into
> dell-wmi-smbios and let both drivers use it from there.
>
> Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
> ---
...
> diff --git a/drivers/platform/x86/dell-smbios.c b/drivers/platform/x86/dell-smbios.c
...
>
> +/*
> + * Descriptor buffer is 128 byte long and contains:
...
> + if (obj->buffer.length != 128) {
> + dev_err(&wdev->dev,
> + "Dell descriptor buffer has invalid length (%d)\n",
> + obj->buffer.length);

This seems odd. We call it an error (not a warning) if != 128, but we only abort
and return an error if it's < 16.

If it's an error, we should return an error code, if anything above 16 is
acceptable but 128 is preferred, the above should be a warning at best. (this
scenario seems unlikely).

> + if (obj->buffer.length < 16) {
> + ret = -EINVAL;
> + goto out;
> + }
> + }
> + desc_buffer = (u32 *)obj->buffer.pointer;
> +
> + if (desc_buffer[0] != 0x4C4C4544 && desc_buffer[1] != 0x494D5720)

This seems like it should be an || ?

(I see this is fixed in a later patch)

I would have suggested fixing it, then moving it - just from a pure ease of
review perspective. Perhaps not in the comment above that this is a verbatim
move, some fixes are coming in subsequent patches. This is worth noting for a
future develop who may be choosing what to backport.

> static int dell_smbios_wmi_probe(struct wmi_device *wdev)
> {
> + int ret;
> + u32 interface_version;

Declarations in order of decreasing line length please.

> @@ -236,6 +316,7 @@ static int dell_smbios_wmi_probe(struct wmi_device *wdev)
> if (!buffer)
> return -ENOMEM;
> bufferlen = sizeof(struct wmi_calling_interface_buffer);
> +

Stray whitespace, should have been in the previous patch I guess?


--
Darren Hart
VMware Open Source Technology Center

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