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cpuidle: Fail cpuidle device registration if there is one already

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[ Upstream commit 7b1b7961170e4fcad488755e5ffaaaf9bd527e8f ]

Refuse to register a cpuidle device if the given CPU has a cpuidle
device already and print a message regarding it.

Without this, an attempt to register a new cpuidle device without
unregistering the existing one leads to the removal of the existing
cpuidle device without removing its sysfs interface.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rafael J. Wysocki
2025-09-19 13:22:20 +02:00
committed by Greg Kroah-Hartman
parent 4b78d57b7d
commit b8961542d2
1 changed files with 7 additions and 1 deletions
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8
drivers/cpuidle/cpuidle.c
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@@ -634,8 +634,14 @@ static void __cpuidle_device_init(struct cpuidle_device *dev)
static int __cpuidle_register_device(struct cpuidle_device *dev)
{
struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
unsigned int cpu = dev->cpu;
int i, ret;
if (per_cpu(cpuidle_devices, cpu)) {
pr_info("CPU%d: cpuidle device already registered\n", cpu);
return -EEXIST;
}
if (!try_module_get(drv->owner))
return -EINVAL;
@@ -647,7 +653,7 @@ static int __cpuidle_register_device(struct cpuidle_device *dev)
dev->states_usage[i].disable |= CPUIDLE_STATE_DISABLED_BY_USER;
}
per_cpu(cpuidle_devices, dev->cpu) = dev;
per_cpu(cpuidle_devices, cpu) = dev;
list_add(&dev->device_list, &cpuidle_detected_devices);
ret = cpuidle_coupled_register_device(dev);