libnvdimm, pfn: fix uuid validation

If we detect a namespace has a stale info block in the init path, we
should overwrite with the latest configuration.  In fact, we already
return -ENODEV when the parent uuid is invalid, the same should be done
for the 'self' uuid.  Otherwise we can get into a condition where
userspace is unable to reconfigure the pfn-device without directly /
manually invalidating the info block.

Cc: <stable@vger.kernel.org>
Reported-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index 254d3bc13f70..e071e214feba 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -376,7 +376,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn)
         } else {
                 /* from init we validate */
                 if (memcmp(nd_pfn->uuid, pfn_sb->uuid, 16) != 0)
-                        return -EINVAL;
+                        return -ENODEV;
         }
 
         if (nd_pfn->align > nvdimm_namespace_capacity(ndns)) {