linux-kernel - [PATCH 1/3] cpufreq: Allow passing NULL as the argument for unregistering a driver

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Date:   Fri, 25 Mar 2022 00:42:26 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     Huang Rui <ray.huang@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
CC:     "open list:AMD PSTATE DRIVER" <linux-pm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH 1/3] cpufreq: Allow passing NULL as the argument for unregistering a driver

Currently the arguments passed to `cpufreq_unregister_driver` are matched
against the currently registered driver.

This means that the only way for a driver to be unregistered is if it's
module is unloaded.  Loosen that restriction to allow other kernel modules
to unregister a registered driver.

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/cpufreq/cpufreq.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 80f535cc8a75..4711c17a89bb 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2885,10 +2885,10 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
 {
 	unsigned long flags;
 
-	if (!cpufreq_driver || (driver != cpufreq_driver))
+	if (!cpufreq_driver)
 		return -EINVAL;
 
-	pr_debug("unregistering driver %s\n", driver->name);
+	pr_debug("unregistering driver %s\n", cpufreq_driver->name);
 
 	/* Protect against concurrent cpu hotplug */
 	cpus_read_lock();
-- 
2.34.1