linux-kernel - [PATCH] cpupower tools: Fix error when running cpupower monitor

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Date:	Mon,  3 Aug 2015 11:46:00 +0530
From:	"Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>
To:	rjw@...ysocki.net, trenn@...e.com
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	pavsubra@...ux.vnet.ibm.com,
	"Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>
Subject: [PATCH] cpupower tools: Fix error when running cpupower monitor

get_cpu_topology() tries to get topology info from all cpus by reading
files in the topology sysfs dir. If a cpu is offlined, since it doesn't
have topology dir, this function fails and returns -1. This causes
functions relying on get_cpu_topology() to fail. For example-

$ cpupower monitor
Cannot read number of available processors

Fix this by skipping fetching topology info for offline cpus.

Signed-off-by: Shreyas B. Prabhu <shreyas@...ux.vnet.ibm.com>
Reported-by: Pavaman Subramaniyam <pavsubra@...ux.vnet.ibm.com>
---
 tools/power/cpupower/utils/helpers/topology.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/power/cpupower/utils/helpers/topology.c b/tools/power/cpupower/utils/helpers/topology.c
index c13120af519b..cea398c176e7 100644
--- a/tools/power/cpupower/utils/helpers/topology.c
+++ b/tools/power/cpupower/utils/helpers/topology.c
@@ -73,6 +73,8 @@ int get_cpu_topology(struct cpupower_topology *cpu_top)
 	for (cpu = 0; cpu < cpus; cpu++) {
 		cpu_top->core_info[cpu].cpu = cpu;
 		cpu_top->core_info[cpu].is_online = sysfs_is_cpu_online(cpu);
+		if (!cpu_top->core_info[cpu].is_online)
+			continue;
 		if(sysfs_topology_read_file(
 			cpu,
 			"physical_package_id",
-- 
1.9.3

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