linux-kernel - [PATCH] cpufreq/amd-pstate: Use sysfs_match

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Message-ID: <20250924175016.709957-1-superm1@kernel.org>
Date: Wed, 24 Sep 2025 12:50:16 -0500
From: "Mario Limonciello (AMD)" <superm1@...nel.org>
To: "Gautham R . Shenoy" <gautham.shenoy@....com>
Cc: Perry Yuan <perry.yuan@....com>,
	linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
	linux-pm@...r.kernel.org (open list:CPU FREQUENCY SCALING FRAMEWORK),
	Mario Limonciello <superm1@...nel.org>
Subject: [PATCH] cpufreq/amd-pstate: Use sysfs_match_string() for epp

Rather than scanning the buffer and manually matching the string
use the sysfs macros.

Signed-off-by: Mario Limonciello (AMD) <superm1@...nel.org>
---
 drivers/cpufreq/amd-pstate.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index ba2adea03db1..b8af6cad9e2c 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -1157,15 +1157,10 @@ static ssize_t store_energy_performance_preference(
 		struct cpufreq_policy *policy, const char *buf, size_t count)
 {
 	struct amd_cpudata *cpudata = policy->driver_data;
-	char str_preference[21];
 	ssize_t ret;
 	u8 epp;
 
-	ret = sscanf(buf, "%20s", str_preference);
-	if (ret != 1)
-		return -EINVAL;
-
-	ret = match_string(energy_perf_strings, -1, str_preference);
+	ret = sysfs_match_string(energy_perf_strings, buf);
 	if (ret < 0)
 		return -EINVAL;
 
-- 
2.51.0