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PCI: Don't look for ACPI hotplug parameters if ACPI is disabled 

Booting a v3.18 or newer Xen domU kernel with PCI devices passed through
results in an oops (this is a 32-bit 3.13.11 dom0 with a 64-bit 4.4.0
hypervisor and 32-bit domU):

  BUG: unable to handle kernel paging request at 0030303e
  IP: [<c06ed0e6>] acpi_ns_validate_handle+0x12/0x1a
  Call Trace:
   [<c06eda4d>] ? acpi_evaluate_object+0x31/0x1fc
   [<c06b78e1>] ? pci_get_hp_params+0x111/0x4e0
   [<c0407bc7>] ? xen_force_evtchn_callback+0x17/0x30
   [<c04085fb>] ? xen_restore_fl_direct_reloc+0x4/0x4
   [<c0699d34>] ? pci_device_add+0x24/0x450

Don't look for ACPI configuration information if ACPI has been disabled.

I don't think this is the best fix, because we can boot plain Linux (no
Xen) with "acpi=off", and we don't need this check in pci_get_hp_params().
There should be a better fix that would make Xen domU work the same way.
The domU kernel has ACPI support but it has no AML.  There should be a way
to initialize the ACPI data structures so things fail gracefully rather
than oopsing.  This is an interim fix to address the regression.

Fixes: 6cd33649fa ("PCI: Add pci_configure_device() during enumeration")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=96301
Reported-by: Michael D Labriola <mlabriol@gdeb.com>
Tested-by: Michael D Labriola <mlabriol@gdeb.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v3.18+
This commit is contained in:
Bjorn Helgaas 2015-03-24 11:12:45 -05:00
parent bc3b5b47c8
commit 8647ca9ad5
1 changed files with 3 additions and 0 deletions
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3
drivers/pci/pci-acpi.c
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@ -248,6 +248,9 @@ int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
acpi_handle handle, phandle;
struct pci_bus *pbus;
if (acpi_pci_disabled)
return -ENODEV;
handle = NULL;
for (pbus = dev->bus; pbus; pbus = pbus->parent) {
handle = acpi_pci_get_bridge_handle(pbus);