wmix_cmd_hdr
struct wmix_cmd_hdr *cmd_hdr;
skb_push(skb, sizeof(struct wmix_cmd_hdr));
cmd_hdr = (struct wmix_cmd_hdr *) skb->data;
struct wmix_cmd_hdr *cmd;
if (skb->len < sizeof(struct wmix_cmd_hdr)) {
cmd = (struct wmix_cmd_hdr *) skb->data;
skb_pull(skb, sizeof(struct wmix_cmd_hdr));