[PATCH v2 11/17] libnvdimm, pmem: flush posted-write queues on shutdown

[Dan Williams]

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

Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
---
 drivers/nvdimm/bus.c  |   16 ++++++++++++++++
 drivers/nvdimm/pmem.c |    8 ++++++++
 include/linux/nd.h    |    1 +
 3 files changed, 25 insertions(+)

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 18cd95719da0..3f3fdb9586b9 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -351,9 +351,16 @@ 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);
@@ -393,6 +400,7 @@ 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);
 };