static int arm_cmn_probe()

in arm-cmn.c [1872:1947]

• 65 lines of code
• 13 McCabe index (conditional complexity)

static int arm_cmn_probe(struct platform_device *pdev)
{
	struct arm_cmn *cmn;
	const char *name;
	static atomic_t id;
	int err, rootnode, this_id;

	cmn = devm_kzalloc(&pdev->dev, sizeof(*cmn), GFP_KERNEL);
	if (!cmn)
		return -ENOMEM;

	cmn->dev = &pdev->dev;
	cmn->model = (unsigned long)device_get_match_data(cmn->dev);
	platform_set_drvdata(pdev, cmn);

	if (cmn->model == CMN600 && has_acpi_companion(cmn->dev)) {
		rootnode = arm_cmn600_acpi_probe(pdev, cmn);
	} else {
		rootnode = 0;
		cmn->base = devm_platform_ioremap_resource(pdev, 0);
		if (IS_ERR(cmn->base))
			return PTR_ERR(cmn->base);
		if (cmn->model == CMN600)
			rootnode = arm_cmn600_of_probe(pdev->dev.of_node);
	}
	if (rootnode < 0)
		return rootnode;

	err = arm_cmn_discover(cmn, rootnode);
	if (err)
		return err;

	err = arm_cmn_init_dtcs(cmn);
	if (err)
		return err;

	err = arm_cmn_init_irqs(cmn);
	if (err)
		return err;

	cmn->cpu = cpumask_local_spread(0, dev_to_node(cmn->dev));
	cmn->pmu = (struct pmu) {
		.module = THIS_MODULE,
		.attr_groups = arm_cmn_attr_groups,
		.capabilities = PERF_PMU_CAP_NO_EXCLUDE,
		.task_ctx_nr = perf_invalid_context,
		.pmu_enable = arm_cmn_pmu_enable,
		.pmu_disable = arm_cmn_pmu_disable,
		.event_init = arm_cmn_event_init,
		.add = arm_cmn_event_add,
		.del = arm_cmn_event_del,
		.start = arm_cmn_event_start,
		.stop = arm_cmn_event_stop,
		.read = arm_cmn_event_read,
		.start_txn = arm_cmn_start_txn,
		.commit_txn = arm_cmn_commit_txn,
		.cancel_txn = arm_cmn_end_txn,
	};

	this_id = atomic_fetch_inc(&id);
	name = devm_kasprintf(cmn->dev, GFP_KERNEL, "arm_cmn_%d", this_id);
	if (!name)
		return -ENOMEM;

	err = cpuhp_state_add_instance(arm_cmn_hp_state, &cmn->cpuhp_node);
	if (err)
		return err;

	err = perf_pmu_register(&cmn->pmu, name, -1);
	if (err)
		cpuhp_state_remove_instance_nocalls(arm_cmn_hp_state, &cmn->cpuhp_node);
	else
		arm_cmn_debugfs_init(cmn, this_id);

	return err;
}