]> git.karo-electronics.de Git - linux-beck.git/commit
PCI/ACPI: Don't cache _PRT, and don't associate them with bus numbers
authorYinghai Lu <yinghai@kernel.org>
Sat, 16 Feb 2013 18:58:34 +0000 (11:58 -0700)
committerBjorn Helgaas <bhelgaas@google.com>
Sat, 16 Feb 2013 18:58:34 +0000 (11:58 -0700)
commit181380b702eee1a9aca51354d7b87c7b08541fcf
treec95dc8c7649fe97c18a99d3ee69ad014adf8cfaa
parentbe6d2867b4f68a575c78fa368abd3ad49980c514
PCI/ACPI: Don't cache _PRT, and don't associate them with bus numbers

Previously, we cached _PRT (PCI routing table, ACPI 5.0 sec 6.2.12)
contents and associated each _PRT entry with a PCI bus number.  The bus
number association means dependencies on PCI device enumeration and bus
number assignment, as well as on the PCI/ACPI binding process.

After 4f535093cf ("PCI: Put pci_dev in device tree as early as possible"),
these dependencies caused the IRQ issues reported by Peter:

    pci 0000:00:1e.0: PCI bridge to [bus 09] (subtractive decode)
    pci 0000:00:1e.0: can't derive routing for PCI INT A
    snd_ctxfi 0000:09:02.0: PCI INT A: no GSI - using ISA IRQ 5
    irq 18: nobody cared (try booting with the "irqpoll" option)

This patch removes _PRT caching.  Instead, we evaluate _PRT as needed
in the pci_enable_device() path.  This also removes the dependency on
PCI bus numbers: we can simply look at the _PRT associated with each
bridge as we walk upstream toward the root.

[bhelgaas: changelog]
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=53561
Reported-and-tested-by: Peter Hurley <peter@hurleysoftware.com>
Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
drivers/acpi/pci_irq.c
drivers/acpi/pci_root.c
drivers/pci/pci-acpi.c
include/acpi/acpi_drivers.h