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ARM: cpuidle: Convert to use cpuidle_register|unregister() 

The only reason that remains, to why the ARM cpuidle driver calls
cpuidle_register_driver(), is to avoid printing an error message in case
another driver already have been registered for the CPU. This seems a bit
silly, but more importantly, if that is a common scenario, perhaps we
should change cpuidle_register() accordingly instead.

In either case, let's consolidate the code, by converting to use
cpuidle_register|unregister(), which also avoids the unnecessary allocation
of the struct cpuidle_device.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2018-11-01 11:15:58 +01:00 committed by Rafael J. Wysocki
parent 763f191af5
commit 3e452e636d
1 changed files with 3 additions and 27 deletions
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30
drivers/cpuidle/cpuidle-arm.c
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@ -82,7 +82,6 @@ static int __init arm_idle_init_cpu(int cpu)
{
int ret;
struct cpuidle_driver *drv;
struct cpuidle_device *dev;
drv = kmemdup(&arm_idle_driver, sizeof(*drv), GFP_KERNEL);
if (!drv)
@ -119,33 +118,12 @@ static int __init arm_idle_init_cpu(int cpu)
goto out_kfree_drv;
}
ret = cpuidle_register_driver(drv);
if (ret) {
if (ret != -EBUSY)
pr_err("Failed to register cpuidle driver\n");
ret = cpuidle_register(drv, NULL);
if (ret)
goto out_kfree_drv;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
ret = -ENOMEM;
goto out_unregister_drv;
}
dev->cpu = cpu;
ret = cpuidle_register_device(dev);
if (ret) {
pr_err("Failed to register cpuidle device for CPU %d\n",
cpu);
goto out_kfree_dev;
}
return 0;
out_kfree_dev:
kfree(dev);
out_unregister_drv:
cpuidle_unregister_driver(drv);
out_kfree_drv:
kfree(drv);
return ret;
@ -176,9 +154,7 @@ out_fail:
while (--cpu >= 0) {
dev = per_cpu(cpuidle_devices, cpu);
drv = cpuidle_get_cpu_driver(dev);
cpuidle_unregister_device(dev);
cpuidle_unregister_driver(drv);
kfree(dev);
cpuidle_unregister(drv);
kfree(drv);
}