linux-kernel - Re: [2/3] ACPI, PCI IRQ: add PCI_USING penalty for ISA interrupts

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Date:   Sun, 2 Oct 2016 22:40:36 +1100
From:   Jonathan Liu <net147@...il.com>
To:     Sinan Kaya <okaya@...eaurora.org>
Cc:     linux-acpi@...r.kernel.org, rjw@...ysocki.net, bhelgaas@...gle.com,
        ravikanth.nalla@....com, linux@...nbow-software.org,
        timur@...eaurora.org, cov@...eaurora.org, jcm@...hat.com,
        alex.williamson@...hat.com, linux-pci@...r.kernel.org,
        agross@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, wim@....tudelft.nl,
        Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [2/3] ACPI, PCI IRQ: add PCI_USING penalty for ISA interrupts

On 2 October 2016 at 04:46, Sinan Kaya <okaya@...eaurora.org> wrote:
> The change introduced in commit 103544d86976 ("ACPI,PCI,IRQ: reduce
> resource requirements") removed PCI_USING penalty from
> acpi_pci_link_allocate function as there is no longer a fixed size penalty
> array for both PCI and IRQ interrupts.
>
> We need to add the PCI_USING penalty for ISA interrupts too if the link is
> in use and matches our ISA IRQ number.
>
> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
> ---
>  drivers/acpi/pci_link.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
> index f3792f4..06c2a11 100644
> --- a/drivers/acpi/pci_link.c
> +++ b/drivers/acpi/pci_link.c
> @@ -620,6 +620,10 @@ static int acpi_pci_link_allocate(struct acpi_pci_link *link)
>                             acpi_device_bid(link->device));
>                 return -ENODEV;
>         } else {
> +               if (link->irq.active < ACPI_MAX_IRQS)
> +                       acpi_irq_penalty[link->irq.active] +=
> +                               PIRQ_PENALTY_PCI_USING;
> +
>                 printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
>                        acpi_device_name(link->device),
>                        acpi_device_bid(link->device), link->irq.active);

This series fixes one or more network adapters in VirtualBox not
working with Linux 32-bit x86 guest if I have 4 network adapters
enabled. The following message no longer appears in the kernel log:
ACPI: No IRQ available for PCI Interrupt Link [LNKD]. Try pci=noacpi or acpi=off

Tested-by: Jonathan Liu <net147@...il.com>