libnvdimm, pmem: flush posted-write queues on shutdown

Commit writes to media on system shutdown or pmem driver unload.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

3 files changed, 25 insertions, 0 deletions

diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index e4882e63bece..1cc7880320fe 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -136,6 +136,21 @@ static int nvdimm_bus_remove(struct device *dev)
         return rc;
 }
 
+static void nvdimm_bus_shutdown(struct device *dev)
+{
+        struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
+        struct nd_device_driver *nd_drv = NULL;
+
+        if (dev->driver)
+                nd_drv = to_nd_device_driver(dev->driver);
+
+        if (nd_drv && nd_drv->shutdown) {
+                nd_drv->shutdown(dev);
+                dev_dbg(&nvdimm_bus->dev, "%s.shutdown(%s)\n",
+                                dev->driver->name, dev_name(dev));
+        }
+}
+
 void nd_device_notify(struct device *dev, enum nvdimm_event event)
 {
         device_lock(dev);
@@ -214,6 +229,7 @@ static struct bus_type nvdimm_bus_type = {
         .match = nvdimm_bus_match,
         .probe = nvdimm_bus_probe,
         .remove = nvdimm_bus_remove,
+        .shutdown = nvdimm_bus_shutdown,
 };
 
 static ASYNC_DOMAIN_EXCLUSIVE(nd_async_domain);
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 9d9c1beef020..8bfc6acc2e43 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -349,9 +349,16 @@ static int nd_pmem_remove(struct device *dev)
 {
         if (is_nd_btt(dev))
                 nvdimm_namespace_detach_btt(to_nd_btt(dev));
+        nvdimm_flush(to_nd_region(dev->parent));
+
         return 0;
 }
 
+static void nd_pmem_shutdown(struct device *dev)
+{
+        nvdimm_flush(to_nd_region(dev->parent));
+}
+
 static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
 {
         struct pmem_device *pmem = dev_get_drvdata(dev);
@@ -391,6 +398,7 @@ static struct nd_device_driver nd_pmem_driver = {
         .probe = nd_pmem_probe,
         .remove = nd_pmem_remove,
         .notify = nd_pmem_notify,
+        .shutdown = nd_pmem_shutdown,
         .drv = {
                 .name = "nd_pmem",
         },
diff --git a/include/linux/nd.h b/include/linux/nd.h
index aee2761d294c..1ecd64643512 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -26,6 +26,7 @@ struct nd_device_driver {
         unsigned long type;
         int (*probe)(struct device *dev);
         int (*remove)(struct device *dev);
+        void (*shutdown)(struct device *dev);
         void (*notify)(struct device *dev, enum nvdimm_event event);
 };