Merge tag 'libnvdimm-for-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm updates from Ira Weiny:
 "A mix of bug fixes and updates to interfaces used by nvdimm:

   - Updates to interfaces include:
        Use the new scope based management
        Remove deprecated ida interfaces
        Update to sysfs_emit()

   - Fixup kdoc comments"

* tag 'libnvdimm-for-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  acpi/nfit: Use sysfs_emit() for all attributes
  nvdimm/namespace: fix kernel-doc for function params
  nvdimm/dimm_devs: fix kernel-doc for function params
  nvdimm/btt: fix btt_blk_cleanup() kernel-doc
  nvdimm-btt: simplify code with the scope based resource management
  nvdimm: Remove usage of the deprecated ida_simple_xx() API
  ACPI: NFIT: Use cleanup.h helpers instead of devm_*()

8 files changed, 71 insertions, 63 deletions

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 9923855377570c..802f8a56d1fa2d 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1186,7 +1186,7 @@ static ssize_t bus_dsm_mask_show(struct device *dev,
 	struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
 	struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
 
-	return sprintf(buf, "%#lx\n", acpi_desc->bus_dsm_mask);
+	return sysfs_emit(buf, "%#lx\n", acpi_desc->bus_dsm_mask);
 }
 static struct device_attribute dev_attr_bus_dsm_mask =
 		__ATTR(dsm_mask, 0444, bus_dsm_mask_show, NULL);
@@ -1198,7 +1198,7 @@ static ssize_t revision_show(struct device *dev,
 	struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
 	struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
 
-	return sprintf(buf, "%d\n", acpi_desc->acpi_header.revision);
+	return sysfs_emit(buf, "%d\n", acpi_desc->acpi_header.revision);
 }
 static DEVICE_ATTR_RO(revision);
 
@@ -1209,7 +1209,7 @@ static ssize_t hw_error_scrub_show(struct device *dev,
 	struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
 	struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc);
 
-	return sprintf(buf, "%d\n", acpi_desc->scrub_mode);
+	return sysfs_emit(buf, "%d\n", acpi_desc->scrub_mode);
 }
 
 /*
@@ -1278,7 +1278,7 @@ static ssize_t scrub_show(struct device *dev,
 	mutex_lock(&acpi_desc->init_mutex);
 	busy = test_bit(ARS_BUSY, &acpi_desc->scrub_flags)
 		&& !test_bit(ARS_CANCEL, &acpi_desc->scrub_flags);
-	rc = sprintf(buf, "%d%s", acpi_desc->scrub_count, busy ? "+\n" : "\n");
+	rc = sysfs_emit(buf, "%d%s", acpi_desc->scrub_count, busy ? "+\n" : "\n");
 	/* Allow an admin to poll the busy state at a higher rate */
 	if (busy && capable(CAP_SYS_RAWIO) && !test_and_set_bit(ARS_POLL,
 				&acpi_desc->scrub_flags)) {
@@ -1382,7 +1382,7 @@ static ssize_t handle_show(struct device *dev,
 {
 	struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
 
-	return sprintf(buf, "%#x\n", memdev->device_handle);
+	return sysfs_emit(buf, "%#x\n", memdev->device_handle);
 }
 static DEVICE_ATTR_RO(handle);
 
@@ -1391,7 +1391,7 @@ static ssize_t phys_id_show(struct device *dev,
 {
 	struct acpi_nfit_memory_map *memdev = to_nfit_memdev(dev);
 
-	return sprintf(buf, "%#x\n", memdev->physical_id);
+	return sysfs_emit(buf, "%#x\n", memdev->physical_id);
 }
 static DEVICE_ATTR_RO(phys_id);
 
@@ -1400,7 +1400,7 @@ static ssize_t vendor_show(struct device *dev,
 {
 	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
-	return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->vendor_id));
+	return sysfs_emit(buf, "0x%04x\n", be16_to_cpu(dcr->vendor_id));
 }
 static DEVICE_ATTR_RO(vendor);
 
@@ -1409,7 +1409,7 @@ static ssize_t rev_id_show(struct device *dev,
 {
 	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
-	return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->revision_id));
+	return sysfs_emit(buf, "0x%04x\n", be16_to_cpu(dcr->revision_id));
 }
 static DEVICE_ATTR_RO(rev_id);
 
@@ -1418,7 +1418,7 @@ static ssize_t device_show(struct device *dev,
 {
 	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
-	return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->device_id));
+	return sysfs_emit(buf, "0x%04x\n", be16_to_cpu(dcr->device_id));
 }
 static DEVICE_ATTR_RO(device);
 
@@ -1427,7 +1427,7 @@ static ssize_t subsystem_vendor_show(struct device *dev,
 {
 	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
-	return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_vendor_id));
+	return sysfs_emit(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_vendor_id));
 }
 static DEVICE_ATTR_RO(subsystem_vendor);
 
@@ -1436,7 +1436,7 @@ static ssize_t subsystem_rev_id_show(struct device *dev,
 {
 	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
-	return sprintf(buf, "0x%04x\n",
+	return sysfs_emit(buf, "0x%04x\n",
 			be16_to_cpu(dcr->subsystem_revision_id));
 }
 static DEVICE_ATTR_RO(subsystem_rev_id);
@@ -1446,7 +1446,7 @@ static ssize_t subsystem_device_show(struct device *dev,
 {
 	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
-	return sprintf(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_device_id));
+	return sysfs_emit(buf, "0x%04x\n", be16_to_cpu(dcr->subsystem_device_id));
 }
 static DEVICE_ATTR_RO(subsystem_device);
 
@@ -1465,7 +1465,7 @@ static ssize_t format_show(struct device *dev,
 {
 	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
-	return sprintf(buf, "0x%04x\n", le16_to_cpu(dcr->code));
+	return sysfs_emit(buf, "0x%04x\n", le16_to_cpu(dcr->code));
 }
 static DEVICE_ATTR_RO(format);
 
@@ -1498,7 +1498,7 @@ static ssize_t format1_show(struct device *dev,
 				continue;
 			if (nfit_dcr->dcr->code == dcr->code)
 				continue;
-			rc = sprintf(buf, "0x%04x\n",
+			rc = sysfs_emit(buf, "0x%04x\n",
 					le16_to_cpu(nfit_dcr->dcr->code));
 			break;
 		}
@@ -1515,7 +1515,7 @@ static ssize_t formats_show(struct device *dev,
 {
 	struct nvdimm *nvdimm = to_nvdimm(dev);
 
-	return sprintf(buf, "%d\n", num_nvdimm_formats(nvdimm));
+	return sysfs_emit(buf, "%d\n", num_nvdimm_formats(nvdimm));
 }
 static DEVICE_ATTR_RO(formats);
 
@@ -1524,7 +1524,7 @@ static ssize_t serial_show(struct device *dev,
 {
 	struct acpi_nfit_control_region *dcr = to_nfit_dcr(dev);
 
-	return sprintf(buf, "0x%08x\n", be32_to_cpu(dcr->serial_number));
+	return sysfs_emit(buf, "0x%08x\n", be32_to_cpu(dcr->serial_number));
 }
 static DEVICE_ATTR_RO(serial);
 
@@ -1536,7 +1536,7 @@ static ssize_t family_show(struct device *dev,
 
 	if (nfit_mem->family < 0)
 		return -ENXIO;
-	return sprintf(buf, "%d\n", nfit_mem->family);
+	return sysfs_emit(buf, "%d\n", nfit_mem->family);
 }
 static DEVICE_ATTR_RO(family);
 
@@ -1548,7 +1548,7 @@ static ssize_t dsm_mask_show(struct device *dev,
 
 	if (nfit_mem->family < 0)
 		return -ENXIO;
-	return sprintf(buf, "%#lx\n", nfit_mem->dsm_mask);
+	return sysfs_emit(buf, "%#lx\n", nfit_mem->dsm_mask);
 }
 static DEVICE_ATTR_RO(dsm_mask);
 
@@ -1562,7 +1562,7 @@ static ssize_t flags_show(struct device *dev,
 	if (test_bit(NFIT_MEM_DIRTY, &nfit_mem->flags))
 		flags |= ACPI_NFIT_MEM_FLUSH_FAILED;
 
-	return sprintf(buf, "%s%s%s%s%s%s%s\n",
+	return sysfs_emit(buf, "%s%s%s%s%s%s%s\n",
 		flags & ACPI_NFIT_MEM_SAVE_FAILED ? "save_fail " : "",
 		flags & ACPI_NFIT_MEM_RESTORE_FAILED ? "restore_fail " : "",
 		flags & ACPI_NFIT_MEM_FLUSH_FAILED ? "flush_fail " : "",
@@ -1579,7 +1579,7 @@ static ssize_t id_show(struct device *dev,
 	struct nvdimm *nvdimm = to_nvdimm(dev);
 	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 
-	return sprintf(buf, "%s\n", nfit_mem->id);
+	return sysfs_emit(buf, "%s\n", nfit_mem->id);
 }
 static DEVICE_ATTR_RO(id);
 
@@ -1589,7 +1589,7 @@ static ssize_t dirty_shutdown_show(struct device *dev,
 	struct nvdimm *nvdimm = to_nvdimm(dev);
 	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
 
-	return sprintf(buf, "%d\n", nfit_mem->dirty_shutdown);
+	return sysfs_emit(buf, "%d\n", nfit_mem->dirty_shutdown);
 }
 static DEVICE_ATTR_RO(dirty_shutdown);
 
@@ -2172,7 +2172,7 @@ static ssize_t range_index_show(struct device *dev,
 	struct nd_region *nd_region = to_nd_region(dev);
 	struct nfit_spa *nfit_spa = nd_region_provider_data(nd_region);
 
-	return sprintf(buf, "%d\n", nfit_spa->spa->range_index);
+	return sysfs_emit(buf, "%d\n", nfit_spa->spa->range_index);
 }
 static DEVICE_ATTR_RO(range_index);
 
@@ -2257,26 +2257,23 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
 		struct nd_region_desc *ndr_desc,
 		struct acpi_nfit_system_address *spa)
 {
+	u16 nr = ndr_desc->num_mappings;
+	struct nfit_set_info2 *info2 __free(kfree) =
+		kcalloc(nr, sizeof(*info2), GFP_KERNEL);
+	struct nfit_set_info *info __free(kfree) =
+		kcalloc(nr, sizeof(*info), GFP_KERNEL);
 	struct device *dev = acpi_desc->dev;
 	struct nd_interleave_set *nd_set;
-	u16 nr = ndr_desc->num_mappings;
-	struct nfit_set_info2 *info2;
-	struct nfit_set_info *info;
 	int i;
 
+	if (!info || !info2)
+		return -ENOMEM;
+
 	nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
 	if (!nd_set)
 		return -ENOMEM;
 	import_guid(&nd_set->type_guid, spa->range_guid);
 
-	info = devm_kcalloc(dev, nr, sizeof(*info), GFP_KERNEL);
-	if (!info)
-		return -ENOMEM;
-
-	info2 = devm_kcalloc(dev, nr, sizeof(*info2), GFP_KERNEL);
-	if (!info2)
-		return -ENOMEM;
-
 	for (i = 0; i < nr; i++) {
 		struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
 		struct nvdimm *nvdimm = mapping->nvdimm;
@@ -2337,8 +2334,6 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
 	}
 
 	ndr_desc->nd_set = nd_set;
-	devm_kfree(dev, info);
-	devm_kfree(dev, info2);
 
 	return 0;
 }
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index 9372c36e8f7645..bb3726b622ad9f 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -16,6 +16,7 @@
 #include <linux/fs.h>
 #include <linux/nd.h>
 #include <linux/backing-dev.h>
+#include <linux/cleanup.h>
 #include "btt.h"
 #include "nd.h"
 
@@ -847,23 +848,20 @@ static int discover_arenas(struct btt *btt)
 {
 	int ret = 0;
 	struct arena_info *arena;
-	struct btt_sb *super;
 	size_t remaining = btt->rawsize;
 	u64 cur_nlba = 0;
 	size_t cur_off = 0;
 	int num_arenas = 0;
 
-	super = kzalloc(sizeof(*super), GFP_KERNEL);
+	struct btt_sb *super __free(kfree) = kzalloc(sizeof(*super), GFP_KERNEL);
 	if (!super)
 		return -ENOMEM;
 
 	while (remaining) {
 		/* Alloc memory for arena */
 		arena = alloc_arena(btt, 0, 0, 0);
-		if (!arena) {
-			ret = -ENOMEM;
-			goto out_super;
-		}
+		if (!arena)
+			return -ENOMEM;
 
 		arena->infooff = cur_off;
 		ret = btt_info_read(arena, super);
@@ -919,14 +917,11 @@ static int discover_arenas(struct btt *btt)
 	btt->nlba = cur_nlba;
 	btt->init_state = INIT_READY;
 
-	kfree(super);
 	return ret;
 
  out:
 	kfree(arena);
 	free_arenas(btt);
- out_super:
-	kfree(super);
 	return ret;
 }
 
@@ -1550,7 +1545,7 @@ static void btt_blk_cleanup(struct btt *btt)
  * @rawsize:	raw size in bytes of the backing device
  * @lbasize:	lba size of the backing device
  * @uuid:	A uuid for the backing device - this is stored on media
- * @maxlane:	maximum number of parallel requests the device can handle
+ * @nd_region:	&struct nd_region for the REGION device
  *
  * Initialize a Block Translation Table on a backing device to provide
  * single sector power fail atomicity.
diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index fabbb31f2c35db..497fd434a6a156 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -19,7 +19,7 @@ static void nd_btt_release(struct device *dev)
 
 	dev_dbg(dev, "trace\n");
 	nd_detach_ndns(&nd_btt->dev, &nd_btt->ndns);
-	ida_simple_remove(&nd_region->btt_ida, nd_btt->id);
+	ida_free(&nd_region->btt_ida, nd_btt->id);
 	kfree(nd_btt->uuid);
 	kfree(nd_btt);
 }
@@ -191,7 +191,7 @@ static struct device *__nd_btt_create(struct nd_region *nd_region,
 	if (!nd_btt)
 		return NULL;
 
-	nd_btt->id = ida_simple_get(&nd_region->btt_ida, 0, 0, GFP_KERNEL);
+	nd_btt->id = ida_alloc(&nd_region->btt_ida, GFP_KERNEL);
 	if (nd_btt->id < 0)
 		goto out_nd_btt;
 
@@ -217,7 +217,7 @@ static struct device *__nd_btt_create(struct nd_region *nd_region,
 	return dev;
 
 out_put_id:
-	ida_simple_remove(&nd_region->btt_ida, nd_btt->id);
+	ida_free(&nd_region->btt_ida, nd_btt->id);
 
 out_nd_btt:
 	kfree(nd_btt);
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 5852fe290523b9..ef3d0f83318b96 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -285,7 +285,7 @@ static void nvdimm_bus_release(struct device *dev)
 	struct nvdimm_bus *nvdimm_bus;
 
 	nvdimm_bus = container_of(dev, struct nvdimm_bus, dev);
-	ida_simple_remove(&nd_ida, nvdimm_bus->id);
+	ida_free(&nd_ida, nvdimm_bus->id);
 	kfree(nvdimm_bus);
 }
 
@@ -342,7 +342,7 @@ struct nvdimm_bus *nvdimm_bus_register(struct device *parent,
 	INIT_LIST_HEAD(&nvdimm_bus->list);
 	INIT_LIST_HEAD(&nvdimm_bus->mapping_list);
 	init_waitqueue_head(&nvdimm_bus->wait);
-	nvdimm_bus->id = ida_simple_get(&nd_ida, 0, 0, GFP_KERNEL);
+	nvdimm_bus->id = ida_alloc(&nd_ida, GFP_KERNEL);
 	if (nvdimm_bus->id < 0) {
 		kfree(nvdimm_bus);
 		return NULL;
diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c
index 3bd61f2457885a..6b4922de30477e 100644
--- a/drivers/nvdimm/dax_devs.c
+++ b/drivers/nvdimm/dax_devs.c
@@ -18,7 +18,7 @@ static void nd_dax_release(struct device *dev)
 
 	dev_dbg(dev, "trace\n");
 	nd_detach_ndns(dev, &nd_pfn->ndns);
-	ida_simple_remove(&nd_region->dax_ida, nd_pfn->id);
+	ida_free(&nd_region->dax_ida, nd_pfn->id);
 	kfree(nd_pfn->uuid);
 	kfree(nd_dax);
 }
@@ -55,7 +55,7 @@ static struct nd_dax *nd_dax_alloc(struct nd_region *nd_region)
 		return NULL;
 
 	nd_pfn = &nd_dax->nd_pfn;
-	nd_pfn->id = ida_simple_get(&nd_region->dax_ida, 0, 0, GFP_KERNEL);
+	nd_pfn->id = ida_alloc(&nd_region->dax_ida, GFP_KERNEL);
 	if (nd_pfn->id < 0) {
 		kfree(nd_dax);
 		return NULL;
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index 1273873582be7c..21498d461fdea6 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -53,7 +53,9 @@ static int validate_dimm(struct nvdimm_drvdata *ndd)
 
 /**
  * nvdimm_init_nsarea - determine the geometry of a dimm's namespace area
- * @nvdimm: dimm to initialize
+ * @ndd: dimm to initialize
+ *
+ * Returns: %0 if the area is already valid, -errno on error
  */
 int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
 {
@@ -194,7 +196,7 @@ static void nvdimm_release(struct device *dev)
 {
 	struct nvdimm *nvdimm = to_nvdimm(dev);
 
-	ida_simple_remove(&dimm_ida, nvdimm->id);
+	ida_free(&dimm_ida, nvdimm->id);
 	kfree(nvdimm);
 }
 
@@ -592,7 +594,7 @@ struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
 	if (!nvdimm)
 		return NULL;
 
-	nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
+	nvdimm->id = ida_alloc(&dimm_ida, GFP_KERNEL);
 	if (nvdimm->id < 0) {
 		kfree(nvdimm);
 		return NULL;
@@ -722,6 +724,9 @@ static unsigned long dpa_align(struct nd_region *nd_region)
  *			   contiguous unallocated dpa range.
  * @nd_region: constrain available space check to this reference region
  * @nd_mapping: container of dpa-resource-root + labels
+ *
+ * Returns: %0 if there is an alignment error, otherwise the max
+ *		unallocated dpa range
  */
 resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
 					   struct nd_mapping *nd_mapping)
@@ -767,6 +772,8 @@ resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
  *
  * Validate that a PMEM label, if present, aligns with the start of an
  * interleave set.
+ *
+ * Returns: %0 if there is an alignment error, otherwise the unallocated dpa
  */
 resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
 				      struct nd_mapping *nd_mapping)
@@ -836,8 +843,10 @@ struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
 
 /**
  * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id
- * @nvdimm: container of dpa-resource-root + labels
+ * @ndd: container of dpa-resource-root + labels
  * @label_id: dpa resource name of the form pmem-<human readable uuid>
+ *
+ * Returns: sum of the dpa allocated to the label_id
  */
 resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
 		struct nd_label_id *label_id)
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 07177eadc56e87..d6d558f94d6bb2 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -27,7 +27,7 @@ static void namespace_pmem_release(struct device *dev)
 	struct nd_region *nd_region = to_nd_region(dev->parent);
 
 	if (nspm->id >= 0)
-		ida_simple_remove(&nd_region->ns_ida, nspm->id);
+		ida_free(&nd_region->ns_ida, nspm->id);
 	kfree(nspm->alt_name);
 	kfree(nspm->uuid);
 	kfree(nspm);
@@ -71,6 +71,8 @@ static int is_namespace_uuid_busy(struct device *dev, void *data)
  * nd_is_uuid_unique - verify that no other namespace has @uuid
  * @dev: any device on a nvdimm_bus
  * @uuid: uuid to check
+ *
+ * Returns: %true if the uuid is unique, %false if not
  */
 bool nd_is_uuid_unique(struct device *dev, uuid_t *uuid)
 {
@@ -337,6 +339,8 @@ static int scan_free(struct nd_region *nd_region,
  * adjust_resource() the allocation to @n, but if @n is larger than the
  * allocation delete it and find the 'new' last allocation in the label
  * set.
+ *
+ * Returns: %0 on success on -errno on error
  */
 static int shrink_dpa_allocation(struct nd_region *nd_region,
 		struct nd_label_id *label_id, resource_size_t n)
@@ -662,6 +666,8 @@ void release_free_pmem(struct nvdimm_bus *nvdimm_bus,
  * allocations from the start of an interleave set and end at the first
  * BLK allocation or the end of the interleave set, whichever comes
  * first.
+ *
+ * Returns: %0 on success on -errno on error
  */
 static int grow_dpa_allocation(struct nd_region *nd_region,
 		struct nd_label_id *label_id, resource_size_t n)
@@ -951,6 +957,8 @@ static ssize_t uuid_show(struct device *dev, struct device_attribute *attr,
  * @dev: namespace type for generating label_id
  * @new_uuid: incoming uuid
  * @old_uuid: reference to the uuid storage location in the namespace object
+ *
+ * Returns: %0 on success on -errno on error
  */
 static int namespace_update_uuid(struct nd_region *nd_region,
 				 struct device *dev, uuid_t *new_uuid,
@@ -1656,8 +1664,10 @@ static int select_pmem_id(struct nd_region *nd_region, const uuid_t *pmem_id)
 /**
  * create_namespace_pmem - validate interleave set labelling, retrieve label0
  * @nd_region: region with mappings to validate
- * @nspm: target namespace to create
+ * @nd_mapping: container of dpa-resource-root + labels
  * @nd_label: target pmem namespace label to evaluate
+ *
+ * Returns: the created &struct device on success or ERR_PTR(-errno) on error
  */
 static struct device *create_namespace_pmem(struct nd_region *nd_region,
 					    struct nd_mapping *nd_mapping,
@@ -1810,7 +1820,7 @@ static struct device *nd_namespace_pmem_create(struct nd_region *nd_region)
 	res->name = dev_name(&nd_region->dev);
 	res->flags = IORESOURCE_MEM;
 
-	nspm->id = ida_simple_get(&nd_region->ns_ida, 0, 0, GFP_KERNEL);
+	nspm->id = ida_alloc(&nd_region->ns_ida, GFP_KERNEL);
 	if (nspm->id < 0) {
 		kfree(nspm);
 		return NULL;
@@ -2188,8 +2198,7 @@ int nd_region_register_namespaces(struct nd_region *nd_region, int *err)
 			struct nd_namespace_pmem *nspm;
 
 			nspm = to_nd_namespace_pmem(dev);
-			id = ida_simple_get(&nd_region->ns_ida, 0, 0,
-					    GFP_KERNEL);
+			id = ida_alloc(&nd_region->ns_ida, GFP_KERNEL);
 			nspm->id = id;
 		} else
 			id = i;
diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index 0d08e21a1cea31..586348125b61ab 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -22,7 +22,7 @@ static void nd_pfn_release(struct device *dev)
 
 	dev_dbg(dev, "trace\n");
 	nd_detach_ndns(&nd_pfn->dev, &nd_pfn->ndns);
-	ida_simple_remove(&nd_region->pfn_ida, nd_pfn->id);
+	ida_free(&nd_region->pfn_ida, nd_pfn->id);
 	kfree(nd_pfn->uuid);
 	kfree(nd_pfn);
 }
@@ -326,7 +326,7 @@ static struct nd_pfn *nd_pfn_alloc(struct nd_region *nd_region)
 	if (!nd_pfn)
 		return NULL;
 
-	nd_pfn->id = ida_simple_get(&nd_region->pfn_ida, 0, 0, GFP_KERNEL);
+	nd_pfn->id = ida_alloc(&nd_region->pfn_ida, GFP_KERNEL);
 	if (nd_pfn->id < 0) {
 		kfree(nd_pfn);
 		return NULL;