3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> When decnet is built as a module a simple: echo 0.0 >/proc/sys/net/decnet/node_address results in most of the sysctl entries under /proc/sys/net/decnet and /proc/sys/net/decnet/conf disappearing. For more details see http://www.spinics.net/lists/netdev/msg226123.html. This change applies the same workaround used in net/core/sysctl_net_core.c and net/ipv6/sysctl_net_ipv6.c of creating a skeleton of decnet sysctl entries before doing anything else. The problem first appeared in kernel 2.6.27. The later rewrite of sysctl in kernel 3.4 restored the previous behavior and eliminated the need for this workaround. This patch was heavily inspired by a similar but more complex patch by Larry Baker. Reported-by: Larry Baker <baker@xxxxxxxx> Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx> --- net/decnet/af_decnet.c | 4 ++++ net/decnet/sysctl_net_decnet.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+), 0 deletions(-) --- a/net/decnet/af_decnet.c +++ b/net/decnet/af_decnet.c @@ -2354,6 +2354,8 @@ static const struct proto_ops dn_proto_o .sendpage = sock_no_sendpage, }; +void dn_register_sysctl_skeleton(void); +void dn_unregister_sysctl_skeleton(void); void dn_register_sysctl(void); void dn_unregister_sysctl(void); @@ -2374,6 +2376,7 @@ static int __init decnet_init(void) if (rc != 0) goto out; + dn_register_sysctl_skeleton(); dn_neigh_init(); dn_dev_init(); dn_route_init(); @@ -2413,6 +2416,7 @@ static void __exit decnet_exit(void) dn_fib_cleanup(); proc_net_remove(&init_net, "decnet"); + dn_unregister_sysctl_skeleton(); proto_unregister(&dn_proto); --- a/net/decnet/sysctl_net_decnet.c +++ b/net/decnet/sysctl_net_decnet.c @@ -55,6 +55,7 @@ static int max_decnet_no_fc_max_cwnd[] = static char node_name[7] = "???"; static struct ctl_table_header *dn_table_header = NULL; +static struct ctl_table_header *dn_skeleton_table_header = NULL; /* * ctype.h :-) @@ -357,6 +358,27 @@ static struct ctl_path dn_path[] = { { } }; +static struct ctl_table empty[1]; + +static struct ctl_table dn_skeleton[] = { + { + .procname = "conf", + .mode = 0555, + .child = empty, + }, + { } +}; + +void dn_register_sysctl_skeleton(void) +{ + dn_skeleton_table_header = register_sysctl_paths(dn_path, dn_skeleton); +} + +void dn_unregister_sysctl_skeleton(void) +{ + unregister_sysctl_table(dn_skeleton_table_header); +} + void dn_register_sysctl(void) { dn_table_header = register_sysctl_paths(dn_path, dn_table); @@ -368,6 +390,12 @@ void dn_unregister_sysctl(void) } #else /* CONFIG_SYSCTL */ +void dn_register_sysctl_skeleton(void) +{ +} +void dn_unregister_sysctl_skeleton(void) +{ +} void dn_unregister_sysctl(void) { } -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html