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libnvdimm, region: hide persistence_domain when unknown

Browse source 
Similar to other region attributes, do not emit the persistence_domain
attribute if its contents are empty.

Fixes: 96c3a23905 ("libnvdimm: expose platform persistence attr...")
Cc: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2018-03-21 14:06:23 -07:00
parent dc9e0a9347
commit 896196dc4e
1 changed files with 7 additions and 0 deletions
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7
drivers/nvdimm/region_devs.c
View file

@ -593,6 +593,13 @@ static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
return 0;
}
if (a == &dev_attr_persistence_domain.attr) {
if ((nd_region->flags & (BIT(ND_REGION_PERSIST_CACHE)
| BIT(ND_REGION_PERSIST_MEMCTRL))) == 0)
return 0;
return a->mode;
}
if (a != &dev_attr_set_cookie.attr
&& a != &dev_attr_available_size.attr)
return a->mode;