Merge branch 'rhashtable-fixes'

Thomas Graf says:

====================
rhashtable rehashing fixes

Some rhashtable rehashing bugs found while testing with the
next rhashtable self-test queued up for the next devel cycle:

https://github.com/tgraf/net-next/commits/rht

v2:
 - Moved schedule_work() call into rhashtable_insert_rehash()
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 3 deletions

diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 4898442b837f..b28df4019ade 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -405,13 +405,18 @@ int rhashtable_insert_rehash(struct rhashtable *ht)
 
         if (rht_grow_above_75(ht, tbl))
                 size *= 2;
-        /* More than two rehashes (not resizes) detected. */
-        else if (WARN_ON(old_tbl != tbl && old_tbl->size == size))
+        /* Do not schedule more than one rehash */
+        else if (old_tbl != tbl)
                 return -EBUSY;
 
         new_tbl = bucket_table_alloc(ht, size, GFP_ATOMIC);
-        if (new_tbl == NULL)
+        if (new_tbl == NULL) {
+                /* Schedule async resize/rehash to try allocation
+                 * non-atomic context.
+                 */
+                schedule_work(&ht->run_work);
                 return -ENOMEM;
+        }
 
         err = rhashtable_rehash_attach(ht, tbl, new_tbl);
         if (err) {