l2tp: define parameters of l2tp_session_get*() as "const"

commit 9aaef50c44f132e040dcd7686c8e78a3390037c5 upstream.

Make l2tp_pernet()'s parameter constant, so that l2tp_session_get*() can
declare their "net" variable as "const".
Also constify "ifname" in l2tp_session_get_by_ifname().

Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index 8e74e69..31c946f 100644 (file)
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -115,7 +115,7 @@ static void l2tp_session_set_header_len(struct l2tp_session *session, int versio
 static void l2tp_tunnel_free(struct l2tp_tunnel *tunnel);
 static void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel);
 
-static inline struct l2tp_net *l2tp_pernet(struct net *net)
+static inline struct l2tp_net *l2tp_pernet(const struct net *net)
 {
        BUG_ON(!net);
 
@@ -228,7 +228,7 @@ EXPORT_SYMBOL_GPL(l2tp_session_find);
 /* Like l2tp_session_find() but takes a reference on the returned session.
  * Optionally calls session->ref() too if do_ref is true.
  */
-struct l2tp_session *l2tp_session_get(struct net *net,
+struct l2tp_session *l2tp_session_get(const struct net *net,
                                      struct l2tp_tunnel *tunnel,
                                      u32 session_id, bool do_ref)
 {
@@ -305,7 +305,8 @@ EXPORT_SYMBOL_GPL(l2tp_session_get_nth);
 /* Lookup a session by interface name.
  * This is very inefficient but is only used by management interfaces.
  */
-struct l2tp_session *l2tp_session_get_by_ifname(struct net *net, char *ifname,
+struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net,
+                                               const char *ifname,
                                                bool do_ref)
 {
        struct l2tp_net *pn = l2tp_pernet(net);

diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h
index 1caf21e..ec3ac0e 100644 (file)
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -222,13 +222,14 @@ out:
        return tunnel;
 }
 
-struct l2tp_session *l2tp_session_get(struct net *net,
+struct l2tp_session *l2tp_session_get(const struct net *net,
                                      struct l2tp_tunnel *tunnel,
                                      u32 session_id, bool do_ref);
 extern struct l2tp_session *l2tp_session_find(struct net *net, struct l2tp_tunnel *tunnel, u32 session_id);
 struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth,
                                          bool do_ref);
-struct l2tp_session *l2tp_session_get_by_ifname(struct net *net, char *ifname,
+struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net,
+                                               const char *ifname,
                                                bool do_ref);
 extern struct l2tp_tunnel *l2tp_tunnel_find(struct net *net, u32 tunnel_id);
 extern struct l2tp_tunnel *l2tp_tunnel_find_nth(struct net *net, int nth);