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libnvdimm: add an api to cast a 'struct nd_region' to its 'struct device'

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For debug, it is useful for bus providers to be able to retrieve the
'struct device' associated with an nd_region instance that it
registered. We already have to_nd_region() to perform the reverse cast
operation, in fact its duplicate declaration can be removed from the
private drivers/nvdimm/nd.h header.

Reviewed-by: Dave Jiang <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2018-04-02 13:14:25 -07:00
commit 243f29fe44
3 changed files with 9 additions and 1 deletions
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1
drivers/nvdimm/nd.h
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@ -341,7 +341,6 @@ static inline struct device *nd_dax_create(struct nd_region *nd_region)
}
#endif
struct nd_region *to_nd_region(struct device *dev);
int nd_region_to_nstype(struct nd_region *nd_region);
int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,

8
drivers/nvdimm/region_devs.c
View file

@ -182,6 +182,14 @@ struct nd_region *to_nd_region(struct device *dev)
}
EXPORT_SYMBOL_GPL(to_nd_region);
struct device *nd_region_dev(struct nd_region *nd_region)
{
if (!nd_region)
return NULL;
return &nd_region->dev;
}
EXPORT_SYMBOL_GPL(nd_region_dev);
struct nd_blk_region *to_nd_blk_region(struct device *dev)
{
struct nd_region *nd_region = to_nd_region(dev);