[NETLINK]: Introduce nlmsg_hdr() helper

For the common "(struct nlmsghdr *)skb->data" sequence, so that we reduce the
number of direct accesses to skb->data and for consistency with all the other
cast skb member helpers.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 3 insertions, 3 deletions

diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
index a905f7820331..7f9c4fb7e5b0 100644
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -212,7 +212,7 @@ static void cn_rx_skb(struct sk_buff *__skb)
         skb = skb_get(__skb);
 
         if (skb->len >= NLMSG_SPACE(0)) {
-                nlh = (struct nlmsghdr *)skb->data;
+                nlh = nlmsg_hdr(skb);
 
                 if (nlh->nlmsg_len < sizeof(struct cn_msg) ||
                     skb->len < nlh->nlmsg_len ||
diff --git a/drivers/scsi/scsi_netlink.c b/drivers/scsi/scsi_netlink.c
index 1b59b27e887f..45646a285244 100644
--- a/drivers/scsi/scsi_netlink.c
+++ b/drivers/scsi/scsi_netlink.c
@@ -50,7 +50,7 @@ scsi_nl_rcv_msg(struct sk_buff *skb)
         while (skb->len >= NLMSG_SPACE(0)) {
                 err = 0;
 
-                nlh = (struct nlmsghdr *) skb->data;
+                nlh = nlmsg_hdr(skb);
                 if ((nlh->nlmsg_len < (sizeof(*nlh) + sizeof(*hdr))) ||
                     (skb->len < nlh->nlmsg_len)) {
                         printk(KERN_WARNING "%s: discarding partial skb\n",
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index ce0d14af33c8..10590cd7e9ed 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -1081,7 +1081,7 @@ iscsi_if_rx(struct sock *sk, int len)
                         struct nlmsghdr *nlh;
                         struct iscsi_uevent *ev;
 
-                        nlh = (struct nlmsghdr *)skb->data;
+                        nlh = nlmsg_hdr(skb);
                         if (nlh->nlmsg_len < sizeof(*nlh) ||
                             skb->len < nlh->nlmsg_len) {
                                 break;