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SubjectRe: [tip:x86/urgent] x86/quirks: Add early quirk to reset Apple AirPort card
On Wed, Jun 8, 2016 at 7:23 AM, tip-bot for Lukas Wunner
<tipbot@zytor.com> wrote:
> Commit-ID: 625a99d9bfd038ea492f57308555bf4e607ce591
> Gitweb: http://git.kernel.org/tip/625a99d9bfd038ea492f57308555bf4e607ce591
> Author: Lukas Wunner <lukas@wunner.de>
> AuthorDate: Sun, 29 May 2016 01:35:28 +0200
...
> ---
> arch/x86/kernel/early-quirks.c | 95 ++++++++++++++++++++++++++++++++++++------
> drivers/bcma/bcma_private.h | 2 -
> include/linux/bcma/bcma.h | 1 +
> 3 files changed, 83 insertions(+), 15 deletions(-)
>
> diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
> index bca14c8..4e4e499 100644
> --- a/arch/x86/kernel/early-quirks.c
> +++ b/arch/x86/kernel/early-quirks.c
...

Extend bus scan range part should be in separated patch?

and put apple_airport_reset() related in second patch.

> -/*
> - * Only works for devices on the root bus. If you add any devices
> - * not on bus 0 readd another loop level in early_quirks(). But
> - * be careful because at least the Nvidia quirk here relies on
> - * only matching on bus 0.
> - */
> static struct chipset early_qrk[] __initdata = {
> { PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
> PCI_CLASS_BRIDGE_PCI, PCI_ANY_ID, QFLAG_APPLY_ONCE, nvidia_bugs },
> @@ -638,9 +692,13 @@ static struct chipset early_qrk[] __initdata = {
> */
> { PCI_VENDOR_ID_INTEL, 0x0f00,
> PCI_CLASS_BRIDGE_HOST, PCI_ANY_ID, 0, force_disable_hpet},
> + { PCI_VENDOR_ID_BROADCOM, 0x4331,
> + PCI_CLASS_NETWORK_OTHER, PCI_ANY_ID, 0, apple_airport_reset},
> {}
> };
>
> +static void __init early_pci_scan_bus(int bus);
> +
> /**
> * check_dev_quirk - apply early quirks to a given PCI device
> * @num: bus number
> @@ -649,7 +707,7 @@ static struct chipset early_qrk[] __initdata = {
> *
> * Check the vendor & device ID against the early quirks table.
> *
> - * If the device is single function, let early_quirks() know so we don't
> + * If the device is single function, let early_pci_scan_bus() know so we don't
> * poke at this device again.
> */
> static int __init check_dev_quirk(int num, int slot, int func)
> @@ -658,6 +716,7 @@ static int __init check_dev_quirk(int num, int slot, int func)
> u16 vendor;
> u16 device;
> u8 type;
> + u8 sec;
> int i;
>
> class = read_pci_config_16(num, slot, func, PCI_CLASS_DEVICE);
> @@ -685,25 +744,35 @@ static int __init check_dev_quirk(int num, int slot, int func)
>
> type = read_pci_config_byte(num, slot, func,
> PCI_HEADER_TYPE);
> +
> + if ((type & 0x7f) == PCI_HEADER_TYPE_BRIDGE) {
> + sec = read_pci_config_byte(num, slot, func, PCI_SECONDARY_BUS);
> + early_pci_scan_bus(sec);

How do you know that sec is valid ?

How about on the system that have one bridge that still have sec num register 0?

it will be get into dead loop.

> + }
> +
> if (!(type & 0x80))
> return -1;
>
> return 0;
> }
>
> -void __init early_quirks(void)
> +static void __init early_pci_scan_bus(int bus)
> {
> int slot, func;
>
> - if (!early_pci_allowed())
> - return;
> -
> /* Poor man's PCI discovery */
> - /* Only scan the root bus */
> for (slot = 0; slot < 32; slot++)
> for (func = 0; func < 8; func++) {
> /* Only probe function 0 on single fn devices */
> - if (check_dev_quirk(0, slot, func))
> + if (check_dev_quirk(bus, slot, func))
> break;
> }
> }
> +
> +void __init early_quirks(void)
> +{
> + if (!early_pci_allowed())
> + return;
> +
> + early_pci_scan_bus(0);
> +}

Would just revert to scan domain 0, bus 0 to 255.

Thanks

Yinghai

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