[SCTP]: Fix compiler warning about const qualifiers

Fix 3 warnings about discarding const qualifiers:

net/sctp/ulpevent.c:862: warning: passing argument 1 of 'sctp_event2skb' discards qualifiers from pointer target type
net/sctp/sm_statefuns.c:4393: warning: passing argument 1 of 'SCTP_ASOC' discards qualifiers from pointer target type
net/sctp/socket.c:5874: warning: passing argument 1 of 'cmsg_nxthdr' discards qualifiers from pointer target type

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 8 insertions, 6 deletions

diff --git a/include/net/sctp/ulpevent.h b/include/net/sctp/ulpevent.h
index 9bcfc12275e8..7ea12e8e6676 100644
--- a/include/net/sctp/ulpevent.h
+++ b/include/net/sctp/ulpevent.h
@@ -67,7 +67,7 @@ struct sctp_ulpevent {
 };
 
 /* Retrieve the skb this event sits inside of. */
-static inline struct sk_buff *sctp_event2skb(struct sctp_ulpevent *ev)
+static inline struct sk_buff *sctp_event2skb(const struct sctp_ulpevent *ev)
 {
         return container_of((void *)ev, struct sk_buff, cb);
 }
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 3ef97499df0d..07194c2a32df 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -4367,6 +4367,7 @@ sctp_disposition_t sctp_sf_do_prm_asoc(const struct sctp_endpoint *ep,
                                        sctp_cmd_seq_t *commands)
 {
         struct sctp_chunk *repl;
+        struct sctp_association* my_asoc;
 
         /* The comment below says that we enter COOKIE-WAIT AFTER
          * sending the INIT, but that doesn't actually work in our
@@ -4390,8 +4391,8 @@ sctp_disposition_t sctp_sf_do_prm_asoc(const struct sctp_endpoint *ep,
         /* Cast away the const modifier, as we want to just
          * rerun it through as a sideffect.
          */
-        sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC,
-                        SCTP_ASOC((struct sctp_association *) asoc));
+        my_asoc = (struct sctp_association *)asoc;
+        sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(my_asoc));
 
         /* Choose transport for INIT. */
         sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT,
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index d994d822900d..998e63a31311 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5868,11 +5868,12 @@ SCTP_STATIC int sctp_msghdr_parse(const struct msghdr *msg,
                                   sctp_cmsgs_t *cmsgs)
 {
         struct cmsghdr *cmsg;
+        struct msghdr *my_msg = (struct msghdr *)msg;
 
         for (cmsg = CMSG_FIRSTHDR(msg);
              cmsg != NULL;
-             cmsg = CMSG_NXTHDR((struct msghdr*)msg, cmsg)) {
-                if (!CMSG_OK(msg, cmsg))
+             cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
+                if (!CMSG_OK(my_msg, cmsg))
                         return -EINVAL;
 
                 /* Should we parse this header or ignore?  */
diff --git a/net/sctp/ulpevent.c b/net/sctp/ulpevent.c
index b43f1f110f87..ce6cda6b6994 100644
--- a/net/sctp/ulpevent.c
+++ b/net/sctp/ulpevent.c
@@ -859,7 +859,7 @@ __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event)
         union sctp_notification *notification;
         struct sk_buff *skb;
 
-        skb = sctp_event2skb((struct sctp_ulpevent *)event);
+        skb = sctp_event2skb(event);
         notification = (union sctp_notification *) skb->data;
         return notification->sn_header.sn_type;
 }