linux-kernel - Re: [PATCH v10 04/15] platform/x86: dell-wmi: don't check length returned

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Date:   Thu, 19 Oct 2017 19:56:00 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Mario Limonciello <mario.limonciello@...l.com>
Cc:     dvhart@...radead.org, Andy Shevchenko <andy.shevchenko@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>, quasisec@...gle.com,
        rjw@...ysocki.net, mjg59@...gle.com, hch@....de,
        Greg KH <greg@...ah.com>, Alan Cox <gnomes@...rguk.ukuu.org.uk>
Subject: Re: [PATCH v10 04/15] platform/x86: dell-wmi: don't check length
 returned

On Thursday 19 October 2017 12:50:07 Mario Limonciello wrote:
> This is intended to be variable and provided by the platform.
> Some platforms this year will be adopting a 32k WMI buffer, so don't
> complain when encountering those platforms or any other future changes.
> 
> Signed-off-by: Mario Limonciello <mario.limonciello@...l.com>
> Reviewed-by: Edward O'Callaghan <quasisec@...gle.com>

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

> ---
>  drivers/platform/x86/dell-wmi.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
> index b2bd396acac5..da4f629d0831 100644
> --- a/drivers/platform/x86/dell-wmi.c
> +++ b/drivers/platform/x86/dell-wmi.c
> @@ -624,7 +624,7 @@ static void dell_wmi_input_destroy(struct wmi_device *wdev)
>   * Vendor Signature          0       4    "DELL"
>   * Object Signature          4       4    " WMI"
>   * WMI Interface Version     8       4    <version>
> - * WMI buffer length        12       4    4096
> + * WMI buffer length        12       4    <length>
>   */
>  static int dell_wmi_check_descriptor_buffer(struct wmi_device *wdev)
>  {
> @@ -674,10 +674,6 @@ static int dell_wmi_check_descriptor_buffer(struct wmi_device *wdev)
>  		dev_warn(&wdev->dev, "Dell descriptor buffer has unknown version (%lu)\n",
>  			(unsigned long) buffer[2]);
>  
> -	if (buffer[3] != 4096)
> -		dev_warn(&wdev->dev, "Dell descriptor buffer has invalid buffer length (%d)\n",
> -			buffer[3]);
> -
>  	priv->interface_version = buffer[2];
>  	ret = 0;
>  

-- 
Pali Rohár
pali.rohar@...il.com