linux-kernel - [PATCH] cpufreq: amd-pstate: Don't create attributes when registration fails

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Date: Sun, 23 Jun 2024 15:09:18 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: <perry.yuan@....com>, <gautham.shenoy@....com>
CC: <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>, "Mario
 Limonciello" <mario.limonciello@....com>, <alex.s.cochran@...ton.me>, "Peter
 Jung" <peterjung1337@...il.com>
Subject: [PATCH] cpufreq: amd-pstate: Don't create attributes when registration fails

If driver registration fails then immediately return the failure
instead of continuing to register attributes.

This fixes issues of falling back from amd-pstate to other drivers
when cpufreq init has failed for any reason.

Reported-by: alex.s.cochran@...ton.me
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
Cc: Peter Jung <peterjung1337@...il.com>
 drivers/cpufreq/amd-pstate.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index 05e80d2f8803..7195dfa98cc5 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -2030,8 +2030,10 @@ static int __init amd_pstate_init(void)
 	}
 
 	ret = cpufreq_register_driver(current_pstate_driver);
-	if (ret)
+	if (ret) {
 		pr_err("failed to register with return %d\n", ret);
+		goto disable_driver;
+	}
 
 	dev_root = bus_get_dev_root(&cpu_subsys);
 	if (dev_root) {
@@ -2047,6 +2049,8 @@ static int __init amd_pstate_init(void)
 
 global_attr_free:
 	cpufreq_unregister_driver(current_pstate_driver);
+disable_driver:
+	amd_pstate_enable(false);
 	return ret;
 }
 device_initcall(amd_pstate_init);
-- 
2.43.0