linux-kernel - Re: [PATCH 1/3] mfd: intel

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Date:   Wed, 30 Sep 2020 08:12:50 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     "David E. Box" <david.e.box@...ux.intel.com>
Cc:     dvhart@...radead.org, andy@...radead.org,
        alexander.h.duyck@...ux.intel.com, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 1/3] mfd: intel_pmt: Add OOBMSM device ID

On Tue, 29 Sep 2020, David E. Box wrote:

> On Tue, 2020-09-29 at 10:51 +0100, Lee Jones wrote:
> > On Fri, 11 Sep 2020, David E. Box wrote:
> > 
> > > Add Out of Band Management Services Module device ID to Intel PMT
> > > driver.
> > > 
> > > Signed-off-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
> > > Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> > > ---
> > >  drivers/mfd/intel_pmt.c | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > > 
> > > diff --git a/drivers/mfd/intel_pmt.c b/drivers/mfd/intel_pmt.c
> > > index 0e572b105101..8f9970ab3026 100644
> > > --- a/drivers/mfd/intel_pmt.c
> > > +++ b/drivers/mfd/intel_pmt.c
> > > @@ -55,6 +55,8 @@ struct pmt_platform_info {
> > >  	unsigned long quirks;
> > >  };
> > >  
> > > +static const struct pmt_platform_info pmt_info;
> > > +
> > >  static const struct pmt_platform_info tgl_info = {
> > >  	.quirks = PMT_QUIRK_NO_WATCHER | PMT_QUIRK_NO_CRASHLOG |
> > >  		  PMT_QUIRK_TABLE_SHIFT,
> > > @@ -200,8 +202,10 @@ static void pmt_pci_remove(struct pci_dev
> > > *pdev)
> > >  	pm_runtime_get_sync(&pdev->dev);
> > >  }
> > >  
> > > +#define PCI_DEVICE_ID_INTEL_PMT_OOBMSM	0x09a7
> > >  #define PCI_DEVICE_ID_INTEL_PMT_TGL	0x9a0d
> > >  static const struct pci_device_id pmt_pci_ids[] = {
> > > +	{ PCI_DEVICE_DATA(INTEL, PMT_OOBMSM, &pmt_info) },
> > 
> > Why are you supplying an empty struct?
> 
> Because the OOBMSM device doesn't need code provided driver data, but
> info is dereferenced in several areas. We also use kmemdup to copy
> driver_data under the assumption that it was provided. We could allow
> for NULL if driver_data is referenced directly.

Just check for NULL.  No need to create and send bogus data.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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