Patch "cpufreq: intel_pstate: fix pstate limits enforcement for adjust_perf call back" has been added to the 6.7-stable tree

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This is a note to let you know that I've just added the patch titled

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

to the 6.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     cpufreq-intel_pstate-fix-pstate-limits-enforcement-f.patch
and it can be found in the queue-6.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit e82b178e30639aa1fb0d8c3799b50e8c956360ef
Author: Doug Smythies <dsmythies@xxxxxxxxx>
Date:   Sat Feb 17 13:30:10 2024 -0800

    cpufreq: intel_pstate: fix pstate limits enforcement for adjust_perf call back
    
    [ Upstream commit f0a0fc10abb062d122db5ac4ed42f6d1ca342649 ]
    
    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: a365ab6b9dfb cpufreq: intel_pstate: Implement the ->adjust_perf() callback
    Signed-off-by: Doug Smythies <dsmythies@xxxxxxxxx>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index f5c69fa230d9b..357e01a272743 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -2983,6 +2983,9 @@ 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;




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