linux-kernel - [PATCH] cpufreq: Fixed kernel crash caused by cpufreq issues

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Date: Thu, 11 Apr 2024 16:18:18 -0700
From: Lizhe <sensor1010@....com>
To: rafael@...nel.org,
	viresh.kumar@...aro.org,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Lizhe <sensor1010@....com>
Subject: [PATCH] cpufreq: Fixed kernel crash caused by cpufreq issues

When the cpufreq_driver does not provide an exit() function.
cpufreq offline operations can result in a kernel crash.

Signed-off-by: Lizhe <sensor1010@....com>
---
 drivers/cpufreq/cpufreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 04d349372de3..e8660bc7d232 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1739,7 +1739,7 @@ static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif)
 	}
 
 	/* We did light-weight exit earlier, do full tear down now */
-	if (cpufreq_driver->offline)
+	if (cpufreq_driver->offline && cpufreq_driver->exit)
 		cpufreq_driver->exit(policy);
 
 	up_write(&policy->rwsem);
-- 
2.25.1