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path: root/drivers/cpuidle/sysfs.c
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Diffstat (limited to 'drivers/cpuidle/sysfs.c')
-rw-r--r--drivers/cpuidle/sysfs.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
index c5adc8c..ae948b1 100644
--- a/drivers/cpuidle/sysfs.c
+++ b/drivers/cpuidle/sysfs.c
@@ -615,6 +615,18 @@ int cpuidle_add_sysfs(struct cpuidle_device *dev)
struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
int error;
+ /*
+ * Return if cpu_device is not setup for this CPU.
+ *
+ * This could happen if the arch did not set up cpu_device
+ * since this CPU is not in cpu_present mask and the
+ * driver did not send a correct CPU mask during registration.
+ * Without this check we would end up passing bogus
+ * value for &cpu_dev->kobj in kobject_init_and_add()
+ */
+ if (!cpu_dev)
+ return -ENODEV;
+
kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
if (!kdev)
return -ENOMEM;
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