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| author | Bjorn Helgaas <bhelgaas@google.com> | 2020-06-02 16:42:33 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2021-01-27 09:38:36 -0600 |
| commit | 508d392ae0bb3729d4c18628e021968a1b11b32c (patch) | |
| tree | 8a7f363cb66dc9896f861b5566b631efc6356e4c /lib/test_overflow.c | |
| parent | 866e61fc40c96e7adba62c9e149e96912b10663c (diff) | |
| download | lwn-508d392ae0bb3729d4c18628e021968a1b11b32c.tar.gz lwn-508d392ae0bb3729d4c18628e021968a1b11b32c.zip | |
PCI/ACPI: Clarify message about _OSC failure
This message:
acpi PNP0A08:02: _OSC failed (AE_NOT_FOUND); disabling ASPM
is alarming and slightly misleading. Per the PCI Firmware Spec, r3.2, sec
4.5.1, _OSC is required for PCIe hierarchies. If _OSC is absent or fails,
the OS must not attempt to use any of the features defined for _OSC. That
includes native hotplug, native PME, AER, and other things as well as ASPM.
Rephrase the message to:
acpi PNP0A08:02: _OSC: platform retains control of PCIe features (AE_NOT_FOUND)
Previous discussion at https://lore.kernel.org/r/20200602223618.GA845676@bjorn-Precision-5520/
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Yicong Yang <yangyicong@hisilicon.com>
Diffstat (limited to 'lib/test_overflow.c')
0 files changed, 0 insertions, 0 deletions