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authorHerbert Xu <herbert@gondor.apana.org.au>2019-03-21 09:39:52 +0800
committerDavid S. Miller <davem@davemloft.net>2019-03-21 13:57:28 -0700
commit408f13ef358aa5ad56dc6230c2c7deb92cf462b1 (patch)
treefd643bfe2c653f0b674c4c91eeea0d120bf52018 /lib
parent6b70fc94afd165342876e53fc4b2f7d085009945 (diff)
downloadlinux-stericsson-408f13ef358aa5ad56dc6230c2c7deb92cf462b1.tar.gz
rhashtable: Still do rehash when we get EEXIST
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: da20420f83ea ("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>
Diffstat (limited to 'lib')
-rw-r--r--lib/rhashtable.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 0a105d4af166..97f59abc3e92 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -416,8 +416,12 @@ 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);