diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 80cc7c089a15..e1d5ea6d5e40 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -94,54 +94,50 @@ static struct acpi_device *to_acpi_dev(struct acpi_nfit_desc *acpi_desc)
 	return to_acpi_device(acpi_desc->dev);
 }
 
-static int xlat_status(void *buf, unsigned int cmd)
+static int xlat_status(void *buf, unsigned int cmd, u32 status)
 {
 	struct nd_cmd_clear_error *clear_err;
 	struct nd_cmd_ars_status *ars_status;
-	struct nd_cmd_ars_start *ars_start;
-	struct nd_cmd_ars_cap *ars_cap;
 	u16 flags;
 
 	switch (cmd) {
 	case ND_CMD_ARS_CAP:
-		ars_cap = buf;
-		if ((ars_cap->status & 0xffff) == NFIT_ARS_CAP_NONE)
+		if ((status & 0xffff) == NFIT_ARS_CAP_NONE)
 			return -ENOTTY;
 
 		/* Command failed */
-		if (ars_cap->status & 0xffff)
+		if (status & 0xffff)
 			return -EIO;
 
 		/* No supported scan types for this range */
 		flags = ND_ARS_PERSISTENT | ND_ARS_VOLATILE;
-		if ((ars_cap->status >> 16 & flags) == 0)
+		if ((status >> 16 & flags) == 0)
 			return -ENOTTY;
 		break;
 	case ND_CMD_ARS_START:
-		ars_start = buf;
 		/* ARS is in progress */
-		if ((ars_start->status & 0xffff) == NFIT_ARS_START_BUSY)
+		if ((status & 0xffff) == NFIT_ARS_START_BUSY)
 			return -EBUSY;
 
 		/* Command failed */
-		if (ars_start->status & 0xffff)
+		if (status & 0xffff)
 			return -EIO;
 		break;
 	case ND_CMD_ARS_STATUS:
 		ars_status = buf;
 		/* Command failed */
-		if (ars_status->status & 0xffff)
+		if (status & 0xffff)
 			return -EIO;
 		/* Check extended status (Upper two bytes) */
-		if (ars_status->status == NFIT_ARS_STATUS_DONE)
+		if (status == NFIT_ARS_STATUS_DONE)
 			return 0;
 
 		/* ARS is in progress */
-		if (ars_status->status == NFIT_ARS_STATUS_BUSY)
+		if (status == NFIT_ARS_STATUS_BUSY)
 			return -EBUSY;
 
 		/* No ARS performed for the current boot */
-		if (ars_status->status == NFIT_ARS_STATUS_NONE)
+		if (status == NFIT_ARS_STATUS_NONE)
 			return -EAGAIN;
 
 		/*
@@ -149,19 +145,19 @@ static int xlat_status(void *buf, unsigned int cmd)
 		 * agent wants the scan to stop.  If we didn't overflow
 		 * then just continue with the returned results.
 		 */
-		if (ars_status->status == NFIT_ARS_STATUS_INTR) {
+		if (status == NFIT_ARS_STATUS_INTR) {
 			if (ars_status->flags & NFIT_ARS_F_OVERFLOW)
 				return -ENOSPC;
 			return 0;
 		}
 
 		/* Unknown status */
-		if (ars_status->status >> 16)
+		if (status >> 16)
 			return -EIO;
 		break;
 	case ND_CMD_CLEAR_ERROR:
 		clear_err = buf;
-		if (clear_err->status & 0xffff)
+		if (status & 0xffff)
 			return -EIO;
 		if (!clear_err->cleared)
 			return -EIO;
@@ -172,6 +168,9 @@ static int xlat_status(void *buf, unsigned int cmd)
 		break;
 	}
 
+	/* all other non-zero status results in an error */
+	if (status)
+		return -EIO;
 	return 0;
 }
 
@@ -186,10 +185,10 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
 	struct nd_cmd_pkg *call_pkg = NULL;
 	const char *cmd_name, *dimm_name;
 	unsigned long cmd_mask, dsm_mask;
+	u32 offset, fw_status = 0;
 	acpi_handle handle;
 	unsigned int func;
 	const u8 *uuid;
-	u32 offset;
 	int rc, i;
 
 	func = cmd;
@@ -317,6 +316,15 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
 				out_obj->buffer.pointer + offset, out_size);
 		offset += out_size;
 	}
+
+	/*
+	 * Set fw_status for all the commands with a known format to be
+	 * later interpreted by xlat_status().
+	 */
+	if (i >= 1 && ((cmd >= ND_CMD_ARS_CAP && cmd <= ND_CMD_CLEAR_ERROR)
+			|| (cmd >= ND_CMD_SMART && cmd <= ND_CMD_VENDOR)))
+		fw_status = *(u32 *) out_obj->buffer.pointer;
+
 	if (offset + in_buf.buffer.length < buf_len) {
 		if (i >= 1) {
 			/*
@@ -325,7 +333,7 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
 			 */
 			rc = buf_len - offset - in_buf.buffer.length;
 			if (cmd_rc)
-				*cmd_rc = xlat_status(buf, cmd);
+				*cmd_rc = xlat_status(buf, cmd, fw_status);
 		} else {
 			dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
 					__func__, dimm_name, cmd_name, buf_len,
@@ -335,7 +343,7 @@ static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
 	} else {
 		rc = 0;
 		if (cmd_rc)
-			*cmd_rc = xlat_status(buf, cmd);
+			*cmd_rc = xlat_status(buf, cmd, fw_status);
 	}
 
  out:
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 715583f69d28..4d7bbd2df5c0 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -99,8 +99,11 @@ static struct nvdimm_map *alloc_nvdimm_map(struct device *dev,
 	nvdimm_map->size = size;
 	kref_init(&nvdimm_map->kref);
 
-	if (!request_mem_region(offset, size, dev_name(&nvdimm_bus->dev)))
+	if (!request_mem_region(offset, size, dev_name(&nvdimm_bus->dev))) {
+		dev_err(&nvdimm_bus->dev, "failed to request %pa + %zd for %s\n",
+				&offset, size, dev_name(dev));
 		goto err_request_region;
+	}
 
 	if (flags)
 		nvdimm_map->mem = memremap(offset, size, flags);
@@ -171,6 +174,9 @@ void *devm_nvdimm_memremap(struct device *dev, resource_size_t offset,
 		kref_get(&nvdimm_map->kref);
 	nvdimm_bus_unlock(dev);
 
+	if (!nvdimm_map)
+		return NULL;
+
 	if (devm_add_action_or_reset(dev, nvdimm_map_put, nvdimm_map))
 		return NULL;
 
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index 8024a0ef86d3..0b78a8211f4a 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -52,10 +52,28 @@ struct nvdimm_drvdata {
 struct nd_region_data {
 	int ns_count;
 	int ns_active;
-	unsigned int flush_mask;
-	void __iomem *flush_wpq[0][0];
+	unsigned int hints_shift;
+	void __iomem *flush_wpq[0];
 };
 
+static inline void __iomem *ndrd_get_flush_wpq(struct nd_region_data *ndrd,
+		int dimm, int hint)
+{
+	unsigned int num = 1 << ndrd->hints_shift;
+	unsigned int mask = num - 1;
+
+	return ndrd->flush_wpq[dimm * num + (hint & mask)];
+}
+
+static inline void ndrd_set_flush_wpq(struct nd_region_data *ndrd, int dimm,
+		int hint, void __iomem *flush)
+{
+	unsigned int num = 1 << ndrd->hints_shift;
+	unsigned int mask = num - 1;
+
+	ndrd->flush_wpq[dimm * num + (hint & mask)] = flush;
+}
+
 static inline struct nd_namespace_index *to_namespace_index(
 		struct nvdimm_drvdata *ndd, int i)
 {
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index e8d5ba7b29af..4c0ac4abb629 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -38,7 +38,7 @@ static int nvdimm_map_flush(struct device *dev, struct nvdimm *nvdimm, int dimm,
 
 	dev_dbg(dev, "%s: map %d flush address%s\n", nvdimm_name(nvdimm),
 			nvdimm->num_flush, nvdimm->num_flush == 1 ? "" : "es");
-	for (i = 0; i < nvdimm->num_flush; i++) {
+	for (i = 0; i < (1 << ndrd->hints_shift); i++) {
 		struct resource *res = &nvdimm->flush_wpq[i];
 		unsigned long pfn = PHYS_PFN(res->start);
 		void __iomem *flush_page;
@@ -54,14 +54,15 @@ static int nvdimm_map_flush(struct device *dev, struct nvdimm *nvdimm, int dimm,
 
 		if (j < i)
 			flush_page = (void __iomem *) ((unsigned long)
-					ndrd->flush_wpq[dimm][j] & PAGE_MASK);
+					ndrd_get_flush_wpq(ndrd, dimm, j)
+					& PAGE_MASK);
 		else
 			flush_page = devm_nvdimm_ioremap(dev,
-					PHYS_PFN(pfn), PAGE_SIZE);
+					PFN_PHYS(pfn), PAGE_SIZE);
 		if (!flush_page)
 			return -ENXIO;
-		ndrd->flush_wpq[dimm][i] = flush_page
-			+ (res->start & ~PAGE_MASK);
+		ndrd_set_flush_wpq(ndrd, dimm, i, flush_page
+				+ (res->start & ~PAGE_MASK));
 	}
 
 	return 0;
@@ -93,7 +94,10 @@ int nd_region_activate(struct nd_region *nd_region)
 		return -ENOMEM;
 	dev_set_drvdata(dev, ndrd);
 
-	ndrd->flush_mask = (1 << ilog2(num_flush)) - 1;
+	if (!num_flush)
+		return 0;
+
+	ndrd->hints_shift = ilog2(num_flush);
 	for (i = 0; i < nd_region->ndr_mappings; i++) {
 		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
 		struct nvdimm *nvdimm = nd_mapping->nvdimm;
@@ -900,8 +904,8 @@ void nvdimm_flush(struct nd_region *nd_region)
 	 */
 	wmb();
 	for (i = 0; i < nd_region->ndr_mappings; i++)
-		if (ndrd->flush_wpq[i][0])
-			writeq(1, ndrd->flush_wpq[i][idx & ndrd->flush_mask]);
+		if (ndrd_get_flush_wpq(ndrd, i, 0))
+			writeq(1, ndrd_get_flush_wpq(ndrd, i, idx));
 	wmb();
 }
 EXPORT_SYMBOL_GPL(nvdimm_flush);
@@ -925,7 +929,7 @@ int nvdimm_has_flush(struct nd_region *nd_region)
 
 	for (i = 0; i < nd_region->ndr_mappings; i++)
 		/* flush hints present, flushing required */
-		if (ndrd->flush_wpq[i][0])
+		if (ndrd_get_flush_wpq(ndrd, i, 0))
 			return 1;
 
 	/*
diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index dd48f421844c..f64c57bf1d4b 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -603,7 +603,8 @@ static int nfit_test0_alloc(struct nfit_test *t)
 			return -ENOMEM;
 		sprintf(t->label[i], "label%d", i);
 
-		t->flush[i] = test_alloc(t, sizeof(u64) * NUM_HINTS,
+		t->flush[i] = test_alloc(t, max(PAGE_SIZE,
+					sizeof(u64) * NUM_HINTS),
 				&t->flush_dma[i]);
 		if (!t->flush[i])
 			return -ENOMEM;