From: Dan Williams <dan.j.williams@intel.com>
Date: Wed, 21 Mar 2018 14:06:23 -0700
Subject: libnvdimm, region: hide persistence_domain when unknown
Patch-mainline: v4.16-rc7
Git-commit: 896196dc4e419a9d0782404e0befac17d638fc01
References: bsc#1091424
Similar to other region attributes, do not emit the persistence_domain
attribute if its contents are empty.
Fixes: 96c3a239054a ("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>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
drivers/nvdimm/region_devs.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index e6d01911e092..a8e9d428c0a5 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -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;
--
2.12.3