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authorBjorn Helgaas <bhelgaas@google.com>2015-03-24 11:12:45 -0500
committerBjorn Helgaas <bhelgaas@google.com>2015-04-08 09:59:55 -0500
commit8647ca9ad5a0065ad53a2ad7e39163592b6ed35e (patch)
tree9ec5fccaf8ec6a0a0d493295fb5c1f695675bee1 /drivers/pci/pci-acpi.c
parentbc3b5b47c80da8838758731d423179262c9c36ec (diff)
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: 6cd33649fa83 ("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+
Diffstat (limited to 'drivers/pci/pci-acpi.c')
-rw-r--r--drivers/pci/pci-acpi.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 489063987325..c93fbe76d281 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -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);