fixed the following coccicheck:
drivers/nvdimm//namespace_devs.c:1626:60-61: WARNING opportunity for
kobj_to_dev().
drivers/nvdimm//region_devs.c:762:60-61: WARNING opportunity for
kobj_to_dev().

since container_of(kobj, typeof(*dev), kobj) and
container_of(kobj, struct device, kobj) are the same, so also
replace container_of(kobj, typeof(*dev), kobj) with the new kobj_to_dev.

Signed-off-by: Tian Tao <[email protected]>
---
 drivers/nvdimm/bus.c            | 2 +-
 drivers/nvdimm/core.c           | 2 +-
 drivers/nvdimm/dimm_devs.c      | 4 ++--
 drivers/nvdimm/namespace_devs.c | 2 +-
 drivers/nvdimm/region_devs.c    | 4 ++--
 5 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 2304c61..cf2b70b 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -713,7 +713,7 @@ static struct attribute *nd_numa_attributes[] = {
 static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a,
                int n)
 {
-       struct device *dev = container_of(kobj, typeof(*dev), kobj);
+       struct device *dev = kobj_to_dev(kobj);
 
        if (!IS_ENABLED(CONFIG_NUMA))
                return 0;
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c
index 7de592d..431e47a 100644
--- a/drivers/nvdimm/core.c
+++ b/drivers/nvdimm/core.c
@@ -503,7 +503,7 @@ static DEVICE_ATTR_ADMIN_RW(activate);
 
 static umode_t nvdimm_bus_firmware_visible(struct kobject *kobj, struct 
attribute *a, int n)
 {
-       struct device *dev = container_of(kobj, typeof(*dev), kobj);
+       struct device *dev = kobj_to_dev(kobj);
        struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
        struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
        enum nvdimm_fwa_capability cap;
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index b59032e..76ee2c3 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -418,7 +418,7 @@ static struct attribute *nvdimm_attributes[] = {
 
 static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)
 {
-       struct device *dev = container_of(kobj, typeof(*dev), kobj);
+       struct device *dev = kobj_to_dev(kobj);
        struct nvdimm *nvdimm = to_nvdimm(dev);
 
        if (a != &dev_attr_security.attr && a != &dev_attr_frozen.attr)
@@ -534,7 +534,7 @@ static struct attribute *nvdimm_firmware_attributes[] = {
 
 static umode_t nvdimm_firmware_visible(struct kobject *kobj, struct attribute 
*a, int n)
 {
-       struct device *dev = container_of(kobj, typeof(*dev), kobj);
+       struct device *dev = kobj_to_dev(kobj);
        struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
        struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
        struct nvdimm *nvdimm = to_nvdimm(dev);
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 6da67f4..1d11ca7 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -1623,7 +1623,7 @@ static struct attribute *nd_namespace_attributes[] = {
 static umode_t namespace_visible(struct kobject *kobj,
                struct attribute *a, int n)
 {
-       struct device *dev = container_of(kobj, struct device, kobj);
+       struct device *dev = kobj_to_dev(kobj);
 
        if (a == &dev_attr_resource.attr && is_namespace_blk(dev))
                return 0;
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index ef23119..92adfaf 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -644,7 +644,7 @@ static struct attribute *nd_region_attributes[] = {
 
 static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
 {
-       struct device *dev = container_of(kobj, typeof(*dev), kobj);
+       struct device *dev = kobj_to_dev(kobj);
        struct nd_region *nd_region = to_nd_region(dev);
        struct nd_interleave_set *nd_set = nd_region->nd_set;
        int type = nd_region_to_nstype(nd_region);
@@ -759,7 +759,7 @@ REGION_MAPPING(31);
 
 static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int 
n)
 {
-       struct device *dev = container_of(kobj, struct device, kobj);
+       struct device *dev = kobj_to_dev(kobj);
        struct nd_region *nd_region = to_nd_region(dev);
 
        if (n < nd_region->ndr_mappings)
-- 
2.7.4
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