linux-kernel - [PATCH v2] cpufreq: amd-pstate: Fix min_perf assignment in amd_pstate_adjust

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Message-ID: <8eefeeb7-f8e8-49f4-b83c-e67a9e728f41@mailbox.org>
Date: Thu, 8 Feb 2024 11:00:50 +0100
From: Tor Vic <torvic9@...lbox.org>
To: Perry Yuan <Perry.Yuan@....com>, Huang Rui <ray.huang@....com>,
 "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
 Mario Limonciello <mario.limonciello@....com>,
 "Shenoy, Gautham Ranjal" <gautham.shenoy@....com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
 Oleksandr Natalenko <oleksandr@...alenko.name>
Subject: [PATCH v2] cpufreq: amd-pstate: Fix min_perf assignment in
 amd_pstate_adjust_perf()

In the function amd_pstate_adjust_perf(), the 'min_perf' variable is set
to 'highest_perf' instead of 'lowest_perf'.

Cc: stable@...r.kernel.org # 6.1+
Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for 
AMD P-State")
Reported-by: Oleksandr Natalenko <oleksandr@...alenko.name>
Reviewed-by: Perry Yuan <Perry.Yuan@....com>
Signed-off-by: Tor Vic <torvic9@...lbox.org>
---
v1->v2: Add Perry's 'Reviewed-by' and 'Cc: stable' tag
---
  drivers/cpufreq/amd-pstate.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 08e112444c27..aa5e57e27d2b 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -577,7 +577,7 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
      if (target_perf < capacity)
          des_perf = DIV_ROUND_UP(cap_perf * target_perf, capacity);

-    min_perf = READ_ONCE(cpudata->highest_perf);
+    min_perf = READ_ONCE(cpudata->lowest_perf);
      if (_min_perf < capacity)
          min_perf = DIV_ROUND_UP(cap_perf * _min_perf, capacity);

-- 
2.43.0