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sctp: optimize the sctp_sysctl_net_register 

Here, when the net is init_net, we needn't to kmemdup the ctl_table
again. So add a check for net. Also we can save some memory.

Signed-off-by: Wang Weidong <wangweidong1@huawei.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
wangweidong 2014-02-12 09:44:44 +08:00 committed by David S. Miller
parent 22a1f5140e
commit efb842c45e
1 changed files with 10 additions and 7 deletions
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17
net/sctp/sysctl.c
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@ -402,15 +402,18 @@ static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
int sctp_sysctl_net_register(struct net *net)
{
struct ctl_table *table;
int i;
struct ctl_table *table = sctp_net_table;
table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
if (!table)
return -ENOMEM;
if (!net_eq(net, &init_net)) {
int i;
for (i = 0; table[i].data; i++)
table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
if (!table)
return -ENOMEM;
for (i = 0; table[i].data; i++)
table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
}
net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
return 0;