Subject: [PATCH 2/6] libnvdimm: Add nd_region_destroy()

From: Oliver O'Halloran <[email-masked]>
Date: Fri, 23 Mar 2018 19:12:05 +1100

Currently there's no way to remove a region from and nvdimm_bus without
tearing down the whole bus. This patch adds an API for removing a single
region from the bus so that we can implement a sensible unbind operation
for the of_nd_region platform driver.

Signed-off-by: Oliver O'Halloran <[email-masked]>
---
 drivers/nvdimm/region_devs.c | 6 ++++++
 include/linux/libnvdimm.h    | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index 2f1d5771100e..76f46fd1fae0 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -1039,6 +1039,12 @@ struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
 }
 EXPORT_SYMBOL_GPL(nvdimm_blk_region_create);
 
+void nd_region_destroy(struct nd_region *region)
+{
+	nd_device_unregister(&region->dev, ND_SYNC);
+}
+EXPORT_SYMBOL_GPL(nd_region_destroy);
+
 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
 		struct nd_region_desc *ndr_desc)
 {
diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
index f61cb5050297..df21ca176e98 100644
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -192,6 +192,7 @@ struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
 		struct nd_region_desc *ndr_desc);
 struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
 		struct nd_region_desc *ndr_desc);
+void nd_region_destroy(struct nd_region *region);
 void *nd_region_provider_data(struct nd_region *nd_region);
 void *nd_blk_region_provider_data(struct nd_blk_region *ndbr);
 void nd_blk_region_set_provider_data(struct nd_blk_region *ndbr, void *data);
-- 
2.9.5