4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ulf Hansson ulf.hansson@linaro.org
commit 763f191af51f127cf8e69cd361f50bf6180768a5 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: a0d46a3dfdc3 (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
--- drivers/cpuidle/cpuidle-arm.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-)
--- a/drivers/cpuidle/cpuidle-arm.c +++ b/drivers/cpuidle/cpuidle-arm.c @@ -103,13 +103,6 @@ static int __init arm_idle_init_cpu(int 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 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);