On 11/24/2015 3:10 PM, Sinan Kaya wrote:
> The ACPI compiler uses the extended format when used interrupt numbers
> are greater than 256. The extended IRQ numbers use 32 bits for storing
> interrupts. The code already supports parsing extended IRQ type but is
> limited by 256 due to used data structure type (u8). This patch changes
> the interrupt number type to 32 bits and places an upper limit of 1020
> as possible interrupt id. 1020 is the maximum interrupt ID that can be
> assigned to an ARM SPI interrupt according to ARM architecture.
>
> Additional checks have been placed to return an error when ACPI_MAX_IRQS
> is exceeded.
>
> Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
> ---
> drivers/acpi/pci_link.c | 27 ++++++++++++++++++++++-----
> 1 file changed, 22 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
> index 7c8408b..8fe4e6f 100644
> --- a/drivers/acpi/pci_link.c
> +++ b/drivers/acpi/pci_link.c
> @@ -1,6 +1,7 @@
> /*
> * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
> *
> + * Copyright (c) 2015, The Linux Foundation. All rights reserved.
> * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@xxxxxxxxx>
> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@xxxxxxxxx>
> * Copyright (C) 2002 Dominik Brodowski <devel@xxxxxxxx>
> @@ -47,6 +48,14 @@ ACPI_MODULE_NAME("pci_link");
> #define ACPI_PCI_LINK_FILE_STATUS "state"
> #define ACPI_PCI_LINK_MAX_POSSIBLE 16
>
> +/*
> + * 1020 is the maximum interrupt ID that can be assigned to
> + * an ARM SPI interrupt according to ARM architecture.
> + */
> +#define ACPI_MAX_IRQS 1020
> +#define ACPI_MAX_ISA_IRQ 16
> +
> +
> static int acpi_pci_link_add(struct acpi_device *device,
> const struct acpi_device_id *not_used);
> static void acpi_pci_link_remove(struct acpi_device *device);
> @@ -67,12 +76,12 @@ static struct acpi_scan_handler pci_link_handler = {
> * later even the link is disable. Instead, we just repick the active irq
> */
> struct acpi_pci_link_irq {
> - u8 active; /* Current IRQ */
> + u32 active; /* Current IRQ */
> u8 triggering; /* All IRQs */
> u8 polarity; /* All IRQs */
> u8 resource_type;
> u8 possible_count;
> - u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
> + u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
> u8 initialized:1;
> u8 reserved:7;
> };
> @@ -147,6 +156,12 @@ static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
> p->interrupts[i]);
> continue;
> }
> + if (p->interrupts[i] > ACPI_MAX_IRQS) {
this should have been >=
> + pr_warn("IRQ %d exceeds max (%d)\n",
> + p->interrupts[i],
> + ACPI_MAX_IRQS);
> + continue;
> + }
> link->irq.possible[i] = p->interrupts[i];
> link->irq.possible_count++;
> }
> @@ -279,6 +294,11 @@ static int acpi_pci_link_get_current(struct acpi_pci_link *link)
> result = -ENODEV;
> }
>
this should have been >=
> + if (irq > ACPI_MAX_IRQS) {
> + pr_err("IRQ %d number exceed max IRQ (%d)\n", irq,
> + ACPI_MAX_IRQS);
> + result = -ENODEV;
> + }
> link->irq.active = irq;
>
> ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
> @@ -437,9 +457,6 @@ static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
> * enabled system.
> */
>
> -#define ACPI_MAX_IRQS 256
> -#define ACPI_MAX_ISA_IRQ 16
> -
> #define PIRQ_PENALTY_PCI_AVAILABLE (0)
> #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
> #define PIRQ_PENALTY_PCI_USING (16*16*16)
>
Bjorn,
Does this look like what you were thinking?
Sinan
--
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
