[PATCH] ACPI: NFIT: add helper to_nfit_mem() to take device to nfit_mem

[Ben Dooks <ben.dooks@codethink.co.uk>]

Add a quick helper to just do struct device to the struct nfit_mem
field it should be referencing. This reduces the number of code
lines in some of the followgn code as it removes the intermediate
struct nvdimm.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
---
 drivers/acpi/nfit/core.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 0fcc247fdfac..9213b426b125 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -1361,18 +1361,22 @@ static const struct attribute_group *acpi_nfit_attribute_groups[] = {
 	NULL,
 };
 
-static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
+static struct nfit_mem *to_nfit_mem(struct device *dev)
 {
 	struct nvdimm *nvdimm = to_nvdimm(dev);
-	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+	return  nvdimm_provider_data(nvdimm);
+}
+
+static struct acpi_nfit_memory_map *to_nfit_memdev(struct device *dev)
+{
+	struct nfit_mem *nfit_mem = to_nfit_mem(dev);
 
 	return __to_nfit_memdev(nfit_mem);
 }
 
 static struct acpi_nfit_control_region *to_nfit_dcr(struct device *dev)
 {
-	struct nvdimm *nvdimm = to_nvdimm(dev);
-	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+	struct nfit_mem *nfit_mem = to_nfit_mem(dev);
 
 	return nfit_mem->dcr;
 }
@@ -1531,8 +1535,7 @@ static DEVICE_ATTR_RO(serial);
 static ssize_t family_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
-	struct nvdimm *nvdimm = to_nvdimm(dev);
-	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+	struct nfit_mem *nfit_mem = to_nfit_mem(dev);
 
 	if (nfit_mem->family < 0)
 		return -ENXIO;
@@ -1543,8 +1546,7 @@ static DEVICE_ATTR_RO(family);
 static ssize_t dsm_mask_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
-	struct nvdimm *nvdimm = to_nvdimm(dev);
-	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+	struct nfit_mem *nfit_mem = to_nfit_mem(dev);
 
 	if (nfit_mem->family < 0)
 		return -ENXIO;
@@ -1555,8 +1557,7 @@ static DEVICE_ATTR_RO(dsm_mask);
 static ssize_t flags_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
-	struct nvdimm *nvdimm = to_nvdimm(dev);
-	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+	struct nfit_mem *nfit_mem = to_nfit_mem(dev);
 	u16 flags = __to_nfit_memdev(nfit_mem)->flags;
 
 	if (test_bit(NFIT_MEM_DIRTY, &nfit_mem->flags))
@@ -1576,8 +1577,7 @@ static DEVICE_ATTR_RO(flags);
 static ssize_t id_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
-	struct nvdimm *nvdimm = to_nvdimm(dev);
-	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+	struct nfit_mem *nfit_mem = to_nfit_mem(dev);
 
 	return sprintf(buf, "%s\n", nfit_mem->id);
 }
@@ -1586,8 +1586,7 @@ static DEVICE_ATTR_RO(id);
 static ssize_t dirty_shutdown_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
-	struct nvdimm *nvdimm = to_nvdimm(dev);
-	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
+	struct nfit_mem *nfit_mem = to_nfit_mem(dev);
 
 	return sprintf(buf, "%d\n", nfit_mem->dirty_shutdown);
 }
-- 
2.40.1