linux-kernel - RE: [PATCH v7 04/15] platform/x86: dell-wmi: allow 32k return size in the descriptor

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Message-ID: <f509606e61454f4496c39c6a492db837@ausx13mpc120.AMER.DELL.COM>
Date:   Wed, 11 Oct 2017 16:37:44 +0000
From:   <Mario.Limonciello@...l.com>
To:     <pali.rohar@...il.com>
CC:     <dvhart@...radead.org>, <andy.shevchenko@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <platform-driver-x86@...r.kernel.org>, <luto@...nel.org>,
        <quasisec@...gle.com>, <rjw@...ysocki.net>, <mjg59@...gle.com>,
        <hch@....de>, <greg@...ah.com>
Subject: RE: [PATCH v7 04/15] platform/x86: dell-wmi: allow 32k return size in
 the descriptor

> -----Original Message-----
> From: Pali Rohár [mailto:pali.rohar@...il.com]
> Sent: Wednesday, October 11, 2017 11:32 AM
> To: Limonciello, Mario <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>
> Subject: Re: [PATCH v7 04/15] platform/x86: dell-wmi: allow 32k return size in the
> descriptor
> 
> On Wednesday 11 October 2017 11:27:30 Mario Limonciello wrote:
> > Some platforms this year will be adopting 32k WMI buffer, so don't
> > complain when encountering those.
> >
> > Signed-off-by: Mario Limonciello <mario.limonciello@...l.com>
> > ---
> >  drivers/platform/x86/dell-wmi.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
> > index ece2fe341f01..c8c7f4f9326c 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    4096 or 32768
> >   */
> >  static int dell_wmi_check_descriptor_buffer(struct wmi_device *wdev)
> >  {
> > @@ -674,7 +674,7 @@ static int dell_wmi_check_descriptor_buffer(struct
> wmi_device *wdev)
> >  		dev_warn(&wdev->dev, "Dell descriptor buffer has unknown
> version (%u)\n",
> >  			buffer[2]);
> >
> > -	if (buffer[3] != 4096)
> > +	if (desc_buffer[3] != 4096 && desc_buffer[3] != 32768)
> 
> Looks like that desc_buffer is not declared.

Yep thanks for catching that was a mistake from all the rebasing and not compile testing this
particular commit. ☹