From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Mon, 4 Nov 2019 14:52:42 +0100
Subject: netfilter: nf_tables_offload: skip EBUSY on chain update
Git-commit: 88c749840dff58e7a40e18bf9bdace15f27ef259
Patch-mainline: 5.4-rc7
References: bnc#1151927 5.3.15

Do not try to bind a chain again if it exists, otherwise the driver
returns EBUSY.

Fixes: c9626a2cbdb2 ("netfilter: nf_tables: add hardware offload support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 net/netfilter/nf_tables_offload.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/netfilter/nf_tables_offload.c
+++ b/net/netfilter/nf_tables_offload.c
@@ -334,7 +334,8 @@ int nft_flow_rule_offload_commit(struct
 
 		switch (trans->msg_type) {
 		case NFT_MSG_NEWCHAIN:
-			if (!(trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD))
+			if (!(trans->ctx.chain->flags & NFT_CHAIN_HW_OFFLOAD) ||
+			    nft_trans_chain_update(trans))
 				continue;
 
 			policy = nft_trans_chain_policy(trans);