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ARM: cpuidle: Don't register the driver when back-end init returns -ENXIO

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commit 763f191af5 upstream.

There's no point to register the cpuidle driver for the current CPU, when
the initialization of the arch specific back-end data fails by returning
-ENXIO.

Instead, let's re-order the sequence to its original flow, by first trying
to initialize the back-end part and then act accordingly on the returned
error code. Additionally, let's print the error message, no matter of what
error code that was returned.

Fixes: a0d46a3dfd (ARM: cpuidle: Register per cpuidle device)
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: 4.19+ <stable@vger.kernel.org> # v4.19+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ulf Hansson 2018-11-01 13:22:38 +01:00 • committed by Greg Kroah-Hartman
commit 110e9082dc
1 changed files with 10 additions and 12 deletions
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22
drivers/cpuidle/cpuidle-arm.c
View file

@ -103,13 +103,6 @@ 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");
goto out_kfree_drv;
}
/*
* Call arch CPU operations in order to initialize
* idle states suspend back-end specific data
@ -117,15 +110,20 @@ static int __init arm_idle_init_cpu(int cpu)
ret = arm_cpuidle_init(cpu);
/*
* Skip the cpuidle device initialization if the reported
* Allow the initialization to continue for other CPUs, if the reported
* failure is a HW misconfiguration/breakage (-ENXIO).
*/
if (ret == -ENXIO)
return 0;
if (ret) {
pr_err("CPU %d failed to init idle CPU ops\n", cpu);
goto out_unregister_drv;
ret = ret == -ENXIO ? 0 : ret;
goto out_kfree_drv;
}
ret = cpuidle_register_driver(drv);
if (ret) {
if (ret != -EBUSY)
pr_err("Failed to register cpuidle driver\n");
goto out_kfree_drv;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);