ARM: cpuidle: Correct driver unregistration if init fails

If cpuidle init fails, the code misses to unregister the driver for
current CPU. Furthermore, we also need to rollback to cancel all
previous CPUs registration; but the code retrieves driver handler by
using function cpuidle_get_driver(), this function returns back
current CPU driver handler but not previous CPU's handler, which leads
to the failure handling code cannot unregister previous CPUs driver.

This commit fixes two mentioned issues, it adds error handling path
'goto out_unregister_drv' for current CPU driver unregistration; and
it is to replace cpuidle_get_driver() with cpuidle_get_cpu_driver(),
the later function can retrieve driver handler for previous CPUs
according to the CPU device handler so can unregister the driver
properly.

This patch also adds extra error handling paths 'goto out_kfree_dev'
and 'goto out_kfree_drv' and adjusts the freeing sentences for previous
CPUs; so make the code more readable for freeing 'dev' and 'drv'
structures.

Suggested-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Fixes: d50a7d8acd78 (ARM: cpuidle: Support asymmetric idle definition)
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpuidle/cpuidle-arm.c

@@ -104,13 +104,13 @@ static int __init arm_idle_init(void)
 		ret = dt_init_idle_driver(drv, arm_idle_state_match, 1);
 		if (ret <= 0) {
 			ret = ret ? : -ENODEV;
-			goto init_fail;
+			goto out_kfree_drv;
 		}
 
 		ret = cpuidle_register_driver(drv);
 		if (ret) {
 			pr_err("Failed to register cpuidle driver\n");
-			goto init_fail;
+			goto out_kfree_drv;
 		}
 
 		/*
@@ -128,14 +128,14 @@ static int __init arm_idle_init(void)
 
 		if (ret) {
 			pr_err("CPU %d failed to init idle CPU ops\n", cpu);
-			goto out_fail;
+			goto out_unregister_drv;
 		}
 
 		dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 		if (!dev) {
 			pr_err("Failed to allocate cpuidle device\n");
 			ret = -ENOMEM;
-			goto out_fail;
+			goto out_unregister_drv;
 		}
 		dev->cpu = cpu;
 
@@ -143,21 +143,25 @@ static int __init arm_idle_init(void)
 		if (ret) {
 			pr_err("Failed to register cpuidle device for CPU %d\n",
 			       cpu);
-			kfree(dev);
-			goto out_fail;
+			goto out_kfree_dev;
 		}
 	}
 
 	return 0;
-init_fail:
+
+out_kfree_dev:
+	kfree(dev);
+out_unregister_drv:
+	cpuidle_unregister_driver(drv);
+out_kfree_drv:
 	kfree(drv);
 out_fail:
 	while (--cpu >= 0) {
 		dev = per_cpu(cpuidle_devices, cpu);
+		drv = cpuidle_get_cpu_driver(dev);
 		cpuidle_unregister_device(dev);
-		kfree(dev);
-		drv = cpuidle_get_driver();
 		cpuidle_unregister_driver(drv);
+		kfree(dev);
 		kfree(drv);
 	}