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In some cases acpi_pci_find_companion() returns an incorrect device object as the ACPI companion for device 0 on the root bus (bus 0). On the affected systems that device is the PCI interface to the host bridge and the "ACPI companion" returned for it corresponds to a non-PCI device located in the SoC (e.g. a sensor on an I2C bus). As a result of this, the ACPI device object "attached" to PCI device 00:00.0 cannot be used for enumerating the device that is really represented by it which (of course) is problematic. Address that issue by preventing acpi_pci_find_companion() from returning a device object with a valid _HID (which by the spec should not be present uder ACPI device objects corresponding to PCI devices) for PCI device 00:00.0. [bhelgaas: use pci_is_root_bus()] Link: https://lore.kernel.org/linux-acpi/1409ba0c-1580-dc09-e6fe-a0c9bcda6462@gmail.com/ Link: https://lore.kernel.org/r/4673285.9aE2nYKHPr@kreacher Reported-by: Daniel Scally <djrscally@gmail.com> Tested-by: Daniel Scally <djrscally@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Daniel Scally <djrscally@gmail.com> |
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.. | ||
controller | ||
endpoint | ||
hotplug | ||
pcie | ||
switch | ||
access.c | ||
ats.c | ||
bus.c | ||
ecam.c | ||
host-bridge.c | ||
iov.c | ||
irq.c | ||
Kconfig | ||
Makefile | ||
mmap.c | ||
msi.c | ||
of.c | ||
p2pdma.c | ||
pci-acpi.c | ||
pci-bridge-emul.c | ||
pci-bridge-emul.h | ||
pci-driver.c | ||
pci-label.c | ||
pci-mid.c | ||
pci-pf-stub.c | ||
pci-stub.c | ||
pci-sysfs.c | ||
pci.c | ||
pci.h | ||
probe.c | ||
proc.c | ||
quirks.c | ||
remove.c | ||
rom.c | ||
search.c | ||
setup-bus.c | ||
setup-irq.c | ||
setup-res.c | ||
slot.c | ||
syscall.c | ||
vc.c | ||
vpd.c | ||
xen-pcifront.c |