linux-kernel - [RESEND PATCH] cpupower: Do not change the frequency of offline cpu

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Date:	Thu, 23 Jul 2015 12:20:27 +0530
From:	Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
To:	rafael.j.wysocki@...el.com
Cc:	trenn@...e.com, ego@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Subject: [RESEND PATCH] cpupower: Do not change the frequency of offline cpu

Check if the cpu is online before changing the frequency/governor of
the cpu.

Reported-by: Pavaman Subramaniyam <pavsubra@...ux.vnet.ibm.com>
Signed-off-by: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Reviewed-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>
Acked-by: Thomas Renninger <trenn@...e.com>
---

Included Reported-by tag

 tools/power/cpupower/utils/cpufreq-set.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/power/cpupower/utils/cpufreq-set.c b/tools/power/cpupower/utils/cpufreq-set.c
index f656e58..4e21357 100644
--- a/tools/power/cpupower/utils/cpufreq-set.c
+++ b/tools/power/cpupower/utils/cpufreq-set.c
@@ -17,6 +17,7 @@
 
 #include "cpufreq.h"
 #include "helpers/helpers.h"
+#include "helpers/sysfs.h"
 
 #define NORM_FREQ_LEN 32
 
@@ -318,6 +319,9 @@ int cmd_freq_set(int argc, char **argv)
 		    cpufreq_cpu_exists(cpu))
 			continue;
 
+		if (sysfs_is_cpu_online(cpu) != 1)
+			continue;
+
 		printf(_("Setting cpu: %d\n"), cpu);
 		ret = do_one_cpu(cpu, &new_pol, freq, policychange);
 		if (ret) {
-- 
1.9.3

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