cpufreq: prevent lockup on reading scaling_available_frequencies

When scaling_available_frequencies is read on an offlined cpu, then either lockup or junk values are displayed. This is caused by freed freq_table, which policy is using. Signed-off-by: Srinivas Pandruvada <[email protected]> Acked-by: Viresh Kumar <[email protected]> Signed-off-by: Rafael J. Wysocki <[email protected]>
0day-ci · Oct 8, 2015 · 55582bc · 55582bc
1 parent e253036
commit 55582bc
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
@@ -1436,8 +1436,10 @@ static void cpufreq_offline_finish(unsigned int cpu)
 	 * since this is a core component, and is essential for the
 	 * subsequent light-weight ->init() to succeed.
 	 */
-	if (cpufreq_driver->exit)
+	if (cpufreq_driver->exit) {
 		cpufreq_driver->exit(policy);
+		policy->freq_table = NULL;
+	}
 }
 
 /**