linux-kernel - [PATCH v2 07/17] libnvdimm: keep region data alive over namespace removal

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Message-ID: <146812110665.32932.12943031269797555126.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:	Sat, 09 Jul 2016 20:25:06 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	linux-nvdimm@...ts.01.org
Cc:	linux-fsdevel@...r.kernel.org, linux-acpi@...r.kernel.org,
	hch@....de, linux-kernel@...r.kernel.org
Subject: [PATCH v2 07/17] libnvdimm: keep region data alive over namespace
 removal

nd_region device driver data will be used in the namespace i/o path.
Re-order nd_region_remove() to ensure this data stays live across
namespace device removal

Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 drivers/nvdimm/region.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c
index 333175dac8d5..8f241772ec0b 100644
--- a/drivers/nvdimm/region.c
+++ b/drivers/nvdimm/region.c
@@ -82,6 +82,8 @@ static int nd_region_remove(struct device *dev)
 {
 	struct nd_region *nd_region = to_nd_region(dev);
 
+	device_for_each_child(dev, NULL, child_unregister);
+
 	/* flush attribute readers and disable */
 	nvdimm_bus_lock(dev);
 	nd_region->ns_seed = NULL;
@@ -91,7 +93,6 @@ static int nd_region_remove(struct device *dev)
 	dev_set_drvdata(dev, NULL);
 	nvdimm_bus_unlock(dev);
 
-	device_for_each_child(dev, NULL, child_unregister);
 	return 0;
 }