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tipc: Refactor __tipc_nl_compat_doit 

As preparation for adding RTNL to make (*cmd->transcode)() and
(*cmd->transcode)() constantly protected by RTNL lock, we move out of
memory allocations existing between them as many as possible so that
the time of holding RTNL can be minimized in __tipc_nl_compat_doit().

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ying Xue 2018-02-14 13:37:58 +08:00 committed by David S. Miller
parent 361b123180
commit e5d1a1eec0
1 changed files with 15 additions and 14 deletions
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29
net/tipc/netlink_compat.c
View File

@ -285,10 +285,6 @@ static int __tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
if (!trans_buf)
return -ENOMEM;
err = (*cmd->transcode)(cmd, trans_buf, msg);
if (err)
goto trans_out;
attrbuf = kmalloc((tipc_genl_family.maxattr + 1) *
sizeof(struct nlattr *), GFP_KERNEL);
if (!attrbuf) {
@ -296,27 +292,32 @@ static int __tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
goto trans_out;
}
err = nla_parse(attrbuf, tipc_genl_family.maxattr,
(const struct nlattr *)trans_buf->data,
trans_buf->len, NULL, NULL);
if (err)
goto parse_out;
doit_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
if (!doit_buf) {
err = -ENOMEM;
goto parse_out;
goto attrbuf_out;
}
doit_buf->sk = msg->dst_sk;
memset(&info, 0, sizeof(info));
info.attrs = attrbuf;
err = (*cmd->transcode)(cmd, trans_buf, msg);
if (err)
goto doit_out;
err = nla_parse(attrbuf, tipc_genl_family.maxattr,
(const struct nlattr *)trans_buf->data,
trans_buf->len, NULL, NULL);
if (err)
goto doit_out;
doit_buf->sk = msg->dst_sk;
err = (*cmd->doit)(doit_buf, &info);
doit_out:
kfree_skb(doit_buf);
parse_out:
attrbuf_out:
kfree(attrbuf);
trans_out:
kfree_skb(trans_buf);