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Commit 3dda7f63 authored by Olof Johansson's avatar Olof Johansson
Browse files

Merge tag 'ccn/fixes-for-4.15' of git://git.linaro.org/people/pawel.moll/linux into fixes 

bus: ARM CCN and CCI PMU driver fixes

This is a bunch of fixes CCN and (guest starring this time) CCI drivers.

* Check for potential of failed allocation for the driver name string
* Manage CPU ID properly at allocation (both CCN and CCI)
* Fix module unload warnings related to objects release order
* Small improvements like using allocating printfs and proper
  attributes constification

The one fixing potential issues have been cc-ed to stable.

* tag 'ccn/fixes-for-4.15' of git://git.linaro.org/people/pawel.moll/linux

:
  bus: arm-ccn: fix module unloading Error: Removing state 147 which has instances left.
  bus: arm-cci: Fix use of smp_processor_id() in preemptible context
  bus: arm-ccn: Fix use of smp_processor_id() in preemptible context
  bus: arm-ccn: Simplify code
  bus: arm-ccn: Check memory allocation failure
  bus: arm-ccn: constify attribute_group structures.

Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parents 69b8df5d b69f63eb

drivers/bus/arm-cci.c

+5 −2
Original line number Diff line number Diff line
@@ -1755,14 +1755,17 @@ static int cci_pmu_probe(struct platform_device *pdev) 
	raw_spin_lock_init(&cci_pmu->hw_events.pmu_lock);

	mutex_init(&cci_pmu->reserve_mutex);

	atomic_set(&cci_pmu->active_events, 0);

	cpumask_set_cpu(smp_processor_id(), &cci_pmu->cpus);

	cpumask_set_cpu(get_cpu(), &cci_pmu->cpus);



	ret = cci_pmu_init(cci_pmu, pdev);

	if (ret)

	if (ret) {

		put_cpu();

		return ret;

	}



	cpuhp_state_add_instance_nocalls(CPUHP_AP_PERF_ARM_CCI_ONLINE,

					 &cci_pmu->node);

	put_cpu();

	pr_info("ARM %s PMU driver probed", cci_pmu->model->name);

	return 0;

}

drivers/bus/arm-ccn.c

+15 −10
Original line number Diff line number Diff line
@@ -262,7 +262,7 @@ static struct attribute *arm_ccn_pmu_format_attrs[] = { 
	NULL

};



static struct attribute_group arm_ccn_pmu_format_attr_group = {

static const struct attribute_group arm_ccn_pmu_format_attr_group = {

	.name = "format",

	.attrs = arm_ccn_pmu_format_attrs,

};
@@ -451,7 +451,7 @@ static struct arm_ccn_pmu_event arm_ccn_pmu_events[] = { 
static struct attribute

		*arm_ccn_pmu_events_attrs[ARRAY_SIZE(arm_ccn_pmu_events) + 1];



static struct attribute_group arm_ccn_pmu_events_attr_group = {

static const struct attribute_group arm_ccn_pmu_events_attr_group = {

	.name = "events",

	.is_visible = arm_ccn_pmu_events_is_visible,

	.attrs = arm_ccn_pmu_events_attrs,
@@ -548,7 +548,7 @@ static struct attribute *arm_ccn_pmu_cmp_mask_attrs[] = { 
	NULL

};



static struct attribute_group arm_ccn_pmu_cmp_mask_attr_group = {

static const struct attribute_group arm_ccn_pmu_cmp_mask_attr_group = {

	.name = "cmp_mask",

	.attrs = arm_ccn_pmu_cmp_mask_attrs,

};
@@ -569,7 +569,7 @@ static struct attribute *arm_ccn_pmu_cpumask_attrs[] = { 
	NULL,

};



static struct attribute_group arm_ccn_pmu_cpumask_attr_group = {

static const struct attribute_group arm_ccn_pmu_cpumask_attr_group = {

	.attrs = arm_ccn_pmu_cpumask_attrs,

};
@@ -1268,10 +1268,12 @@ static int arm_ccn_pmu_init(struct arm_ccn *ccn) 
	if (ccn->dt.id == 0) {

		name = "ccn";

	} else {

		int len = snprintf(NULL, 0, "ccn_%d", ccn->dt.id);



		name = devm_kzalloc(ccn->dev, len + 1, GFP_KERNEL);

		snprintf(name, len + 1, "ccn_%d", ccn->dt.id);

		name = devm_kasprintf(ccn->dev, GFP_KERNEL, "ccn_%d",

				      ccn->dt.id);

		if (!name) {

			err = -ENOMEM;

			goto error_choose_name;

		}

	}



	/* Perf driver registration */
@@ -1298,7 +1300,7 @@ static int arm_ccn_pmu_init(struct arm_ccn *ccn) 
	}



	/* Pick one CPU which we will use to collect data from CCN... */

	cpumask_set_cpu(smp_processor_id(), &ccn->dt.cpu);

	cpumask_set_cpu(get_cpu(), &ccn->dt.cpu);



	/* Also make sure that the overflow interrupt is handled by this CPU */

	if (ccn->irq) {
@@ -1315,10 +1317,13 @@ static int arm_ccn_pmu_init(struct arm_ccn *ccn) 


	cpuhp_state_add_instance_nocalls(CPUHP_AP_PERF_ARM_CCN_ONLINE,

					 &ccn->dt.node);

	put_cpu();

	return 0;



error_pmu_register:

error_set_affinity:

	put_cpu();

error_choose_name:

	ida_simple_remove(&arm_ccn_pmu_ida, ccn->dt.id);

	for (i = 0; i < ccn->num_xps; i++)

		writel(0, ccn->xp[i].base + CCN_XP_DT_CONTROL);
@@ -1581,8 +1586,8 @@ static int __init arm_ccn_init(void) 


static void __exit arm_ccn_exit(void)

{

	cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CCN_ONLINE);

	platform_driver_unregister(&arm_ccn_driver);

	cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_CCN_ONLINE);

}



module_init(arm_ccn_init);