[PATCH pci/host-iproc] pci-iproc: skip check for legacy IRQ on PAXC buses

[Bjorn Helgaas]

On Thu, Dec 01, 2016 at 03:34:52PM -0500, Andy Gospodarek wrote:
> PAXC and PAXCv2 buses do not support legacy IRQs so there is no reason
> to even try and map them.  Without a change like this, one cannot create
> VFs on Nitro ports since legacy interrupts are checked as part of the
> PCI device creation process.  Testing on PAXC hardware showed that VFs
> are properly created with only the change to not set pcie->map_irq, but
> just to be safe the change in iproc_pcie_setup will ensure that
> pdev_fixup_irq will not panic.
> 
> Signed-off-by: Andy Gospodarek <gospo at broadcom.com>
> Signed-off-by: Ray Jui <rjui at broadcom.com>

Applied to pci/host-iproc for v4.10 with Ray's acked-by, thanks!

> ---
>  drivers/pci/host/pcie-iproc-platform.c | 9 ++++++++-
>  drivers/pci/host/pcie-iproc.c          | 5 ++++-
>  2 files changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/host/pcie-iproc-platform.c b/drivers/pci/host/pcie-iproc-platform.c
> index fd3ed9b..22d814a 100644
> --- a/drivers/pci/host/pcie-iproc-platform.c
> +++ b/drivers/pci/host/pcie-iproc-platform.c
> @@ -108,7 +108,14 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	pcie->map_irq = of_irq_parse_and_map_pci;
> +	/* PAXC doesn't support legacy IRQs, skip mapping */
> +	switch (pcie->type) {
> +	case IPROC_PCIE_PAXC:
> +	case IPROC_PCIE_PAXC_V2:
> +		break;
> +	default:
> +		pcie->map_irq = of_irq_parse_and_map_pci;
> +	}
>  
>  	ret = iproc_pcie_setup(pcie, &res);
>  	if (ret)
> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
> index cd51334..3ebc025 100644
> --- a/drivers/pci/host/pcie-iproc.c
> +++ b/drivers/pci/host/pcie-iproc.c
> @@ -1274,7 +1274,10 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
>  
>  	pci_scan_child_bus(bus);
>  	pci_assign_unassigned_bus_resources(bus);
> -	pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
> +
> +	if (pcie->map_irq)
> +		pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
> +
>  	pci_bus_add_devices(bus);
>  
>  	return 0;
> -- 
> 2.1.0
> 
> 
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