linux-kernel - Re: [PATCH V3 02/16] platform/x86/intel/vsec: remove platform

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Date:   Thu, 12 Oct 2023 09:55:48 -0700
From:   "David E. Box" <david.e.box@...ux.intel.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org, rajvi.jingar@...ux.intel.com
Subject: Re: [PATCH V3 02/16] platform/x86/intel/vsec: remove platform_info
 from vsec device structure

On Thu, 2023-10-12 at 18:31 +0300, Ilpo Järvinen wrote:
> On Wed, 11 Oct 2023, David E. Box wrote:
> 
> > In preparation for exporting an API to register Intel Vendor Specific
> > Extended Capabilities (VSEC) from other drivers, remove the pointer to
> > platform_info from intel_vsec_device. This prevents a potential page fault
> > when auxiliary drivers probe and attempt to dereference this pointer to
> > access the needed quirks field. Instead, just add the quirks to
> > intel_vsec_device.
> > 
> > Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> > Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> > ---
> > V3 - No change
> > 
> > V2 - New patch splitting previous PATCH 1
> > 
> >  drivers/platform/x86/intel/pmt/class.c | 2 +-
> >  drivers/platform/x86/intel/vsec.c      | 2 +-
> >  drivers/platform/x86/intel/vsec.h      | 2 +-
> >  3 files changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/platform/x86/intel/pmt/class.c
> > b/drivers/platform/x86/intel/pmt/class.c
> > index f32a233470de..2ad91d2fd954 100644
> > --- a/drivers/platform/x86/intel/pmt/class.c
> > +++ b/drivers/platform/x86/intel/pmt/class.c
> > @@ -31,7 +31,7 @@ bool intel_pmt_is_early_client_hw(struct device *dev)
> >          * differences from the server platforms (which use the Out Of Band
> >          * Management Services Module OOBMSM).
> >          */
> > -       return !!(ivdev->info->quirks & VSEC_QUIRK_EARLY_HW);
> > +       return !!(ivdev->quirks & VSEC_QUIRK_EARLY_HW);
> >  }
> >  EXPORT_SYMBOL_NS_GPL(intel_pmt_is_early_client_hw, INTEL_PMT);
> >  
> > diff --git a/drivers/platform/x86/intel/vsec.c
> > b/drivers/platform/x86/intel/vsec.c
> > index 6bb233a23414..15866b7d3117 100644
> > --- a/drivers/platform/x86/intel/vsec.c
> > +++ b/drivers/platform/x86/intel/vsec.c
> > @@ -201,7 +201,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev,
> > struct intel_vsec_header *he
> >         intel_vsec_dev->pcidev = pdev;
> >         intel_vsec_dev->resource = res;
> >         intel_vsec_dev->num_resources = header->num_entries;
> > -       intel_vsec_dev->info = info;
> > +       intel_vsec_dev->quirks = info->quirks;
> >  
> >         if (header->id == VSEC_ID_SDSI)
> >                 intel_vsec_dev->ida = &intel_vsec_sdsi_ida;
> > diff --git a/drivers/platform/x86/intel/vsec.h
> > b/drivers/platform/x86/intel/vsec.h
> > index c242c07ea69c..8b9fad170503 100644
> > --- a/drivers/platform/x86/intel/vsec.h
> > +++ b/drivers/platform/x86/intel/vsec.h
> > @@ -79,11 +79,11 @@ struct intel_vsec_device {
> >         struct pci_dev *pcidev;
> >         struct resource *resource;
> >         struct ida *ida;
> > -       struct intel_vsec_platform_info *info;
> >         int num_resources;
> >         int id; /* xa */
> 
> What is this based on??
> 
> Unfortunately, I couldn't review some of your later patches efficiently 
> because this patch failed to apply.

platform-drivers-x86-v6.6-1 tag

I guess I need to update but I didn't expect any new changes that would
conflict.

David