On 01/11/2018 13:22, Ulf Hansson wrote:

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.

Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Fixes: a0d46a3dfdc3 ("ARM: cpuidle: Register per cpuidle device") Cc: stable@vger.kernel.org # v4.19+

Reviewed-by: Daniel Lezcano daniel.lezcano@linaro.org

---

Changes in v2:

• Added a fixes and a stable tag.

---

drivers/cpuidle/cpuidle-arm.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c index 073557f433eb..df564d783216 100644 --- a/drivers/cpuidle/cpuidle-arm.c +++ b/drivers/cpuidle/cpuidle-arm.c @@ -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);