mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-24 11:25:43 +00:00
Code Issues Releases Wiki Activity

cpufreq: intel_pstate: fix pstate limits enforcement for adjust_perf call back

Browse source 
[ Upstream commit f0a0fc10ab ]

There is a loophole in pstate limit clamping for the intel_cpufreq CPU
frequency scaling driver (intel_pstate in passive mode), schedutil CPU
frequency scaling governor, HWP (HardWare Pstate) control enabled, when
the adjust_perf call back path is used.

Fix it.

Fixes: a365ab6b9d cpufreq: intel_pstate: Implement the ->adjust_perf() callback
Signed-off-by: Doug Smythies <dsmythies@telus.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Doug Smythies 2024-02-17 13:30:10 -08:00 committed by Greg Kroah-Hartman
parent 29360fd328
commit e85b3c1539
1 changed files with 3 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
drivers/cpufreq/intel_pstate.c
View file

@ -2952,6 +2952,9 @@ static void intel_cpufreq_adjust_perf(unsigned int cpunum,
if (min_pstate < cpu->min_perf_ratio)
min_pstate = cpu->min_perf_ratio;
if (min_pstate > cpu->max_perf_ratio)
min_pstate = cpu->max_perf_ratio;
max_pstate = min(cap_pstate, cpu->max_perf_ratio);
if (max_pstate < min_pstate)
max_pstate = min_pstate;