netdev - [PATCH v3 1/2] rhashtable: require max_shift if grow

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Date:	Tue, 24 Feb 2015 12:25:35 -0500
From:	Josh Hunt <johunt@...mai.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>, Thomas Graf <tgraf@...g.ch>
Cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	Daniel Borkmann <daniel@...earbox.net>,
	Josh Hunt <johunt@...mai.com>
Subject: [PATCH v3 1/2] rhashtable: require max_shift if grow_decision defined

If an rhashtable user defines a grow_decision fn they must also define a
max_shift parameter.

Acked-by: Thomas Graf <tgraf@...g.ch>
Signed-off-by: Josh Hunt <johunt@...mai.com>
---
 lib/rhashtable.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 9cc4c4a..7d6f539 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -1077,7 +1077,8 @@ int rhashtable_init(struct rhashtable *ht, struct rhashtable_params *params)
 	size = HASH_DEFAULT_SIZE;
 
 	if ((params->key_len && !params->hashfn) ||
-	    (!params->key_len && !params->obj_hashfn))
+	    (!params->key_len && !params->obj_hashfn) ||
+	    (params->grow_decision && !params->max_shift))
 		return -EINVAL;
 
 	if (params->nulls_base && params->nulls_base < (1U << RHT_BASE_SHIFT))
-- 
1.7.9.5

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