From 55582bccdc1e89ecc973c260d46e247df675d4df Mon Sep 17 00:00:00 2001 From: Srinivas Pandruvada Date: Wed, 7 Oct 2015 13:50:44 -0700 Subject: [PATCH] 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 Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index ef5ed9470de9..25c4c15103a0 100644 --- 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; + } } /** -- 2.30.2