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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>
This commit is contained in:
Dan Williams 2016-04-07 19:59:27 -07:00
parent 2112911266
commit e5670563f5
1 changed files with 1 additions and 1 deletions
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2
drivers/nvdimm/pfn_devs.c
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@ -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)) {