static int init_active_labels()

in namespace_devs.c [2512:2585]

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

static int init_active_labels(struct nd_region *nd_region)
{
	int i, rc = 0;

	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
		struct nvdimm *nvdimm = nd_mapping->nvdimm;
		struct nd_label_ent *label_ent;
		int count, j;

		/*
		 * If the dimm is disabled then we may need to prevent
		 * the region from being activated.
		 */
		if (!ndd) {
			if (test_bit(NDD_LOCKED, &nvdimm->flags))
				/* fail, label data may be unreadable */;
			else if (test_bit(NDD_LABELING, &nvdimm->flags))
				/* fail, labels needed to disambiguate dpa */;
			else
				continue;

			dev_err(&nd_region->dev, "%s: is %s, failing probe\n",
					dev_name(&nd_mapping->nvdimm->dev),
					test_bit(NDD_LOCKED, &nvdimm->flags)
					? "locked" : "disabled");
			rc = -ENXIO;
			goto out;
		}
		nd_mapping->ndd = ndd;
		atomic_inc(&nvdimm->busy);
		get_ndd(ndd);

		count = nd_label_active_count(ndd);
		dev_dbg(ndd->dev, "count: %d\n", count);
		if (!count)
			continue;
		for (j = 0; j < count; j++) {
			struct nd_namespace_label *label;

			label_ent = kzalloc(sizeof(*label_ent), GFP_KERNEL);
			if (!label_ent)
				break;
			label = nd_label_active(ndd, j);
			if (test_bit(NDD_NOBLK, &nvdimm->flags)) {
				u32 flags = nsl_get_flags(ndd, label);

				flags &= ~NSLABEL_FLAG_LOCAL;
				nsl_set_flags(ndd, label, flags);
			}
			label_ent->label = label;

			mutex_lock(&nd_mapping->lock);
			list_add_tail(&label_ent->list, &nd_mapping->labels);
			mutex_unlock(&nd_mapping->lock);
		}

		if (j < count)
			break;
	}

	if (i < nd_region->ndr_mappings)
		rc = -ENOMEM;

out:
	if (rc) {
		deactivate_labels(nd_region);
		return rc;
	}

	return devm_add_action_or_reset(&nd_region->dev, deactivate_labels,
					nd_region);
}