linux-kernel - Re: [PATCH 2/4] misc: hpilo: Exclude unsupported device via blacklist

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Date:   Thu, 21 Feb 2019 09:33:55 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Matt Hsiao <matt.hsiao@....com>
Cc:     linux-kernel@...r.kernel.org, arnd@...db.de,
        david.altobelli@....com, mark.rusk@....com, jerry.hoemann@....com
Subject: Re: [PATCH 2/4] misc: hpilo: Exclude unsupported device via blacklist

On Thu, Feb 21, 2019 at 04:04:40PM +0800, Matt Hsiao wrote:
> Instead of having explicit if statments excluding devices,
> use a pci_device_id table of devices to blacklist.
> 
> Signed-off-by: Matt Hsiao <matt.hsiao@....com>
> ---
>  drivers/misc/hpilo.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
> index 01c407a..0224e50 100644
> --- a/drivers/misc/hpilo.c
> +++ b/drivers/misc/hpilo.c
> @@ -29,6 +29,11 @@
>  static unsigned int ilo_major;
>  static unsigned int max_ccb = 16;
>  static char ilo_hwdev[MAX_ILO_DEV];
> +static const struct pci_device_id ilo_blacklist[] = {
> +	/* auxiliary iLO */
> +	{PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3307, PCI_VENDOR_ID_HP, 0x1979)},
> +	{}
> +};
>  
>  static inline int get_entry_id(int entry)
>  {
> @@ -763,10 +768,10 @@ static int ilo_probe(struct pci_dev *pdev,
>  	int devnum, minor, start, error = 0;
>  	struct ilo_hwinfo *ilo_hw;
>  
> -	/* Ignore auxiliary iLO device */
> -	if (pdev->subsystem_vendor == PCI_VENDOR_ID_HP &&
> -	    pdev->subsystem_device == 0x1979)
> -		return 0;
> +	if (pci_match_id(ilo_blacklist, pdev)) {
> +		dev_dbg(&pdev->dev, "Not supported on this device\n");
> +		return -ENODEV;
> +	}

Why not just merge this into the previous patch?

And why do some devices need to be blacklisted, shouldn't there only be
a whitelist in the first place?  Do you need to tighten up your original
device ids?

thanks,

greg k-h