[PATCH 3/3] powerpc/pcidn: Warn when sriov pci_dn management is used incorrectly

[Sam Bobroff]

On Wed, Aug 21, 2019 at 04:26:55PM +1000, Oliver O'Halloran wrote:
> These functions can only be used on a SR-IOV capable physical function and
> they're only called in pcibios_sriov_enable / disable. Make them emit a
> warning in the future if they're used incorrectly and remove the dead
> code that checks if the device is a VF.
> 
> Signed-off-by: Oliver O'Halloran <oohall at gmail.com>

Looks good, but you might want to consider using WARN_ON_ONCE() just in
case it gets hit a lot.

Reviewed-by: Sam Bobroff <sbobroff at linux.ibm.com>

> ---
>  arch/powerpc/kernel/pci_dn.c | 17 +++--------------
>  1 file changed, 3 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
> index 24da1d8..69dafc3 100644
> --- a/arch/powerpc/kernel/pci_dn.c
> +++ b/arch/powerpc/kernel/pci_dn.c
> @@ -158,8 +158,8 @@ struct pci_dn *add_sriov_vf_pdns(struct pci_dev *pdev)
>  	int i;
>  
>  	/* Only support IOV for now */
> -	if (!pdev->is_physfn)
> -		return pci_get_pdn(pdev);
> +	if (WARN_ON(!pdev->is_physfn))
> +		return NULL;
>  
>  	/* Check if VFs have been populated */
>  	pdn = pci_get_pdn(pdev);
> @@ -199,19 +199,8 @@ void remove_sriov_vf_pdns(struct pci_dev *pdev)
>  	struct pci_dn *pdn, *tmp;
>  	int i;
>  
> -	/*
> -	 * VF and VF PE are created/released dynamically, so we need to
> -	 * bind/unbind them.  Otherwise the VF and VF PE would be mismatched
> -	 * when re-enabling SR-IOV.
> -	 */
> -	if (pdev->is_virtfn) {
> -		pdn = pci_get_pdn(pdev);
> -		pdn->pe_number = IODA_INVALID_PE;
> -		return;
> -	}
> -
>  	/* Only support IOV PF for now */
> -	if (!pdev->is_physfn)
> +	if (WARN_ON(!pdev->is_physfn))
>  		return;
>  
>  	/* Check if VFs have been populated */
> -- 
> 2.9.5
> 
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