libnvdimm/region: Rewrite _probe_success() to _advance_seeds()

The nd_region_probe_success() helper collides seed management with
nvdimm->busy tracking. Given the 'busy' increment is handled internal to the
nd_region driver 'probe' path move the decrement to the 'remove' path.
With that cleanup the routine can be renamed to the more descriptive
nd_region_advance_seeds().

The change is prompted by an incoming need to optionally advance the
seeds on other events besides 'probe' success.

Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Link: https://lore.kernel.org/r/20190905154603.10349-2-aneesh.kumar@linux.ibm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 10 insertions, 58 deletions

diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index b477a8dc0020..cd6da354eae4 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -715,85 +715,37 @@ void nd_mapping_free_labels(struct nd_mapping *nd_mapping)
 }
 
 /*
- * Upon successful probe/remove, take/release a reference on the
- * associated interleave set (if present), and plant new btt + namespace
- * seeds.  Also, on the removal of a BLK region, notify the provider to
- * disable the region.
+ * When a namespace is activated create new seeds for the next
+ * namespace, or namespace-personality to be configured.
  */
-static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
-		struct device *dev, bool probe)
+void nd_region_advance_seeds(struct nd_region *nd_region, struct device *dev)
 {
-	struct nd_region *nd_region;
-
-	if (!probe && is_nd_region(dev)) {
-		int i;
-
-		nd_region = to_nd_region(dev);
-		for (i = 0; i < nd_region->ndr_mappings; i++) {
-			struct nd_mapping *nd_mapping = &nd_region->mapping[i];
-			struct nvdimm_drvdata *ndd = nd_mapping->ndd;
-			struct nvdimm *nvdimm = nd_mapping->nvdimm;
-
-			mutex_lock(&nd_mapping->lock);
-			nd_mapping_free_labels(nd_mapping);
-			mutex_unlock(&nd_mapping->lock);
-
-			put_ndd(ndd);
-			nd_mapping->ndd = NULL;
-			if (ndd)
-				atomic_dec(&nvdimm->busy);
-		}
-	}
-	if (dev->parent && is_nd_region(dev->parent) && probe) {
-		nd_region = to_nd_region(dev->parent);
-		nvdimm_bus_lock(dev);
-		if (nd_region->ns_seed == dev)
-			nd_region_create_ns_seed(nd_region);
-		nvdimm_bus_unlock(dev);
-	}
-	if (is_nd_btt(dev) && probe) {
+	nvdimm_bus_lock(dev);
+	if (nd_region->ns_seed == dev) {
+		nd_region_create_ns_seed(nd_region);
+	} else if (is_nd_btt(dev)) {
 		struct nd_btt *nd_btt = to_nd_btt(dev);
 
-		nd_region = to_nd_region(dev->parent);
-		nvdimm_bus_lock(dev);
 		if (nd_region->btt_seed == dev)
 			nd_region_create_btt_seed(nd_region);
 		if (nd_region->ns_seed == &nd_btt->ndns->dev)
 			nd_region_create_ns_seed(nd_region);
-		nvdimm_bus_unlock(dev);
-	}
-	if (is_nd_pfn(dev) && probe) {
+	} else if (is_nd_pfn(dev)) {
 		struct nd_pfn *nd_pfn = to_nd_pfn(dev);
 
-		nd_region = to_nd_region(dev->parent);
-		nvdimm_bus_lock(dev);
 		if (nd_region->pfn_seed == dev)
 			nd_region_create_pfn_seed(nd_region);
 		if (nd_region->ns_seed == &nd_pfn->ndns->dev)
 			nd_region_create_ns_seed(nd_region);
-		nvdimm_bus_unlock(dev);
-	}
-	if (is_nd_dax(dev) && probe) {
+	} else if (is_nd_dax(dev)) {
 		struct nd_dax *nd_dax = to_nd_dax(dev);
 
-		nd_region = to_nd_region(dev->parent);
-		nvdimm_bus_lock(dev);
 		if (nd_region->dax_seed == dev)
 			nd_region_create_dax_seed(nd_region);
 		if (nd_region->ns_seed == &nd_dax->nd_pfn.ndns->dev)
 			nd_region_create_ns_seed(nd_region);
-		nvdimm_bus_unlock(dev);
 	}
-}
-
-void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev)
-{
-	nd_region_notify_driver_action(nvdimm_bus, dev, true);
-}
-
-void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev)
-{
-	nd_region_notify_driver_action(nvdimm_bus, dev, false);
+	nvdimm_bus_unlock(dev);
 }
 
 static ssize_t mappingN(struct device *dev, char *buf, int n)