mm/hmm: add missing pfns set to hmm_vma_walk_pmd()

All success exit paths from the walker functions must set the pfns array.

A migration entry with no required fault is a HMM_PFN_NONE return, just
like the pte case.

Fixes: d08faca018c4 ("mm/hmm: properly handle migration pmd")
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/mm/hmm.c b/mm/hmm.c
index 0e7a572..09fc456 100644 (file)
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -402,7 +402,7 @@ again:
                        pmd_migration_entry_wait(walk->mm, pmdp);
                        return -EBUSY;
                }
-               return 0;
+               return hmm_pfns_fill(start, end, range, HMM_PFN_NONE);
        } else if (!pmd_present(pmd))
                return hmm_pfns_fill(start, end, range, HMM_PFN_ERROR);