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sock_diag: Simplify sock_diag_handlers[] handling in __sock_diag_rcv_msg

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The sock_diag_lock_handler() and sock_diag_unlock_handler() actually
make the code less readable. Get rid of them and make the lock usage
and access to sock_diag_handlers[] clear on the first sight.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mathias Krause 2013-02-23 01:13:48 +00:00 • committed by David S. Miller
parent 6e601a5356
commit 8e904550d0
1 changed files with 7 additions and 17 deletions
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24
net/core/sock_diag.c
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@ -97,21 +97,6 @@ void sock_diag_unregister(const struct sock_diag_handler *hnld)
} }
EXPORT_SYMBOL_GPL(sock_diag_unregister); EXPORT_SYMBOL_GPL(sock_diag_unregister);
static const inline struct sock_diag_handler *sock_diag_lock_handler(int family)
{
if (sock_diag_handlers[family] == NULL)
request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
NETLINK_SOCK_DIAG, family);
mutex_lock(&sock_diag_table_mutex);
return sock_diag_handlers[family];
}
static inline void sock_diag_unlock_handler(const struct sock_diag_handler *h)
{
mutex_unlock(&sock_diag_table_mutex);
}
static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{ {
int err; int err;
@ -124,12 +109,17 @@ static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (req->sdiag_family >= AF_MAX) if (req->sdiag_family >= AF_MAX)
return -EINVAL; return -EINVAL;
hndl = sock_diag_lock_handler(req->sdiag_family); if (sock_diag_handlers[req->sdiag_family] == NULL)
request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
NETLINK_SOCK_DIAG, req->sdiag_family);
mutex_lock(&sock_diag_table_mutex);
hndl = sock_diag_handlers[req->sdiag_family];
if (hndl == NULL) if (hndl == NULL)
err = -ENOENT; err = -ENOENT;
else else
err = hndl->dump(skb, nlh); err = hndl->dump(skb, nlh);
sock_diag_unlock_handler(hndl); mutex_unlock(&sock_diag_table_mutex);
return err; return err;
} }