From e59d82fd33f7670cf67fd69cf684aa589ec8340a Mon Sep 17 00:00:00 2001 From: Mathias Krause Date: Fri, 9 May 2014 23:43:41 +0200 Subject: vti6: Simplify error handling in module init and exit The error handling in the module init and exit functions can be shortened to safe us some code. 1/ Remove the code duplications in the init function, jump straight to the existing cleanup code by adding some labels. Also give the error message some more value by telling the reason why loading the module has failed. 2/ Remove the error handling in the exit function as the only legitimate reason xfrm6_protocol_deregister() might fail is inet6_del_protocol() returning -1. That, in turn, means some other protocol handler had been registered for this very protocol in the meantime. But that essentially means we haven't been handling that protocol any more, anyway. What it definitely means not is that we "can't deregister protocol". Therefore just get rid of that bogus warning. It's plain wrong. Signed-off-by: Mathias Krause Signed-off-by: Steffen Klassert --- net/ipv6/ip6_vti.c | 51 ++++++++++++++++++++------------------------------- 1 file changed, 20 insertions(+), 31 deletions(-) (limited to 'net') diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c index 9aaa6bb229e4..b61b0b1bb7ce 100644 --- a/net/ipv6/ip6_vti.c +++ b/net/ipv6/ip6_vti.c @@ -1089,36 +1089,26 @@ static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = { **/ static int __init vti6_tunnel_init(void) { - int err; + const char *msg; + int err; + msg = "tunnel device"; err = register_pernet_device(&vti6_net_ops); if (err < 0) - goto out_pernet; + goto pernet_dev_failed; + msg = "tunnel protocols"; err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP); - if (err < 0) { - pr_err("%s: can't register vti6 protocol\n", __func__); - - goto out; - } - + if (err < 0) + goto xfrm_proto_esp_failed; err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH); - if (err < 0) { - xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); - pr_err("%s: can't register vti6 protocol\n", __func__); - - goto out; - } - + if (err < 0) + goto xfrm_proto_ah_failed; err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP); - if (err < 0) { - xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); - xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); - pr_err("%s: can't register vti6 protocol\n", __func__); - - goto out; - } + if (err < 0) + goto xfrm_proto_comp_failed; + msg = "netlink interface"; err = rtnl_link_register(&vti6_link_ops); if (err < 0) goto rtnl_link_failed; @@ -1127,11 +1117,14 @@ static int __init vti6_tunnel_init(void) rtnl_link_failed: xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); +xfrm_proto_comp_failed: xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); +xfrm_proto_ah_failed: xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); -out: +xfrm_proto_esp_failed: unregister_pernet_device(&vti6_net_ops); -out_pernet: +pernet_dev_failed: + pr_err("vti6 init: failed to register %s\n", msg); return err; } @@ -1141,13 +1134,9 @@ out_pernet: static void __exit vti6_tunnel_cleanup(void) { rtnl_link_unregister(&vti6_link_ops); - if (xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP)) - pr_info("%s: can't deregister protocol\n", __func__); - if (xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH)) - pr_info("%s: can't deregister protocol\n", __func__); - if (xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP)) - pr_info("%s: can't deregister protocol\n", __func__); - + xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP); + xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH); + xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP); unregister_pernet_device(&vti6_net_ops); } -- cgit v1.2.3