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authorMathias Krause <minipli@googlemail.com>2014-05-09 23:43:42 +0200
committerSteffen Klassert <steffen.klassert@secunet.com>2014-06-26 08:21:57 +0200
commit1990e4f883a6383b04ef37f32bdaa02dc0dbae8d (patch)
tree10df5de557e665e09809dbdf84b0938a68d5a72f /net/ipv4/ip_vti.c
parentvti6: Simplify error handling in module init and exit (diff)
downloadlinux-dev-1990e4f883a6383b04ef37f32bdaa02dc0dbae8d.tar.xz
linux-dev-1990e4f883a6383b04ef37f32bdaa02dc0dbae8d.zip
vti: 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. Furthermore fix the "IPSec" typo -- it should be "IPsec" instead. 2/ Remove the error handling in the exit function as the only legitimate reason xfrm4_protocol_deregister() might fail is inet_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 tunnel". Therefore just get rid of that bogus warning. It's plain wrong. Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/ipv4/ip_vti.c')
-rw-r--r--net/ipv4/ip_vti.c54
1 files changed, 21 insertions, 33 deletions
diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
index b8960f3527f3..e453cb724a95 100644
--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -534,40 +534,28 @@ static struct rtnl_link_ops vti_link_ops __read_mostly = {
static int __init vti_init(void)
{
+ const char *msg;
int err;
- pr_info("IPv4 over IPSec tunneling driver\n");
+ pr_info("IPv4 over IPsec tunneling driver\n");
+ msg = "tunnel device";
err = register_pernet_device(&vti_net_ops);
if (err < 0)
- return err;
- err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
- if (err < 0) {
- unregister_pernet_device(&vti_net_ops);
- pr_info("vti init: can't register tunnel\n");
-
- return err;
- }
+ goto pernet_dev_failed;
+ msg = "tunnel protocols";
+ err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP);
+ if (err < 0)
+ goto xfrm_proto_esp_failed;
err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH);
- if (err < 0) {
- xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
- unregister_pernet_device(&vti_net_ops);
- pr_info("vti init: can't register tunnel\n");
-
- return err;
- }
-
+ if (err < 0)
+ goto xfrm_proto_ah_failed;
err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP);
- if (err < 0) {
- xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
- xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
- unregister_pernet_device(&vti_net_ops);
- pr_info("vti init: can't register tunnel\n");
-
- return err;
- }
+ if (err < 0)
+ goto xfrm_proto_comp_failed;
+ msg = "netlink interface";
err = rtnl_link_register(&vti_link_ops);
if (err < 0)
goto rtnl_link_failed;
@@ -576,23 +564,23 @@ static int __init vti_init(void)
rtnl_link_failed:
xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
+xfrm_proto_comp_failed:
xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
+xfrm_proto_ah_failed:
xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
+xfrm_proto_esp_failed:
unregister_pernet_device(&vti_net_ops);
+pernet_dev_failed:
+ pr_err("vti init: failed to register %s\n", msg);
return err;
}
static void __exit vti_fini(void)
{
rtnl_link_unregister(&vti_link_ops);
- if (xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP))
- pr_info("vti close: can't deregister tunnel\n");
- if (xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH))
- pr_info("vti close: can't deregister tunnel\n");
- if (xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP))
- pr_info("vti close: can't deregister tunnel\n");
-
-
+ xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
+ xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
+ xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
unregister_pernet_device(&vti_net_ops);
}