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| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2019-03-25 12:04:39 -0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-03-25 18:57:21 -0400 |
| commit | edef1ef134180149694b86386277076f566d165c (patch) | |
| tree | 6538951169dd5373f32d09b8a316be312a9758d7 /lib/mpi/mpiutil.c | |
| parent | 8c2ffd9174779014c3fe1f96d9dc3641d9175f00 (diff) | |
ACPI / CPPC: Fix guaranteed performance handling
As per the ACPI specification, "Guaranteed Performance Register" is
a "Buffer" field and it cannot be "Integer", so treat the "Integer"
type for "Guaranteed Performance Register" field as invalid and
ignore its value in that case.
Also save one cpc_read() call when "Guaranteed Performance Register"
is not present, which means a register defined as:
"Register(SystemMemory, 0, 0, 0, 0)".
Fixes: 29523f095397 ("ACPI / CPPC: Add support for guaranteed performance")
Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: 4.20+ <stable@vger.kernel.org> # 4.20+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'lib/mpi/mpiutil.c')
0 files changed, 0 insertions, 0 deletions