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rhashtable: Still do rehash when we get EEXIST 

[ Upstream commit 408f13ef35 ]

As it stands if a shrink is delayed because of an outstanding
rehash, we will go into a rescheduling loop without ever doing
the rehash.

This patch fixes this by still carrying out the rehash and then
rescheduling so that we can shrink after the completion of the
rehash should it still be necessary.

The return value of EEXIST captures this case and other cases
(e.g., another thread expanded/rehashed the table at the same
time) where we should still proceed with the rehash.

Fixes: da20420f83 ("rhashtable: Add nested tables")
Reported-by: Josh Elsasser <jelsasser@appneta.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Josh Elsasser <jelsasser@appneta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Herbert Xu 2019-03-21 09:39:52 +08:00 committed by Greg Kroah-Hartman
parent 68979f5ecc
commit 9f6e90284f
1 changed files with 6 additions and 2 deletions
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8
lib/rhashtable.c
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@ -459,8 +459,12 @@ static void rht_deferred_worker(struct work_struct *work)
else if (tbl->nest)
err = rhashtable_rehash_alloc(ht, tbl, tbl->size);
if (!err)
err = rhashtable_rehash_table(ht);
if (!err || err == -EEXIST) {
int nerr;
nerr = rhashtable_rehash_table(ht);
err = err ?: nerr;
}
mutex_unlock(&ht->mutex);