include/net/genetlink.h: Allow genlmsg_cancel to accept a NULL argument

nlmsg_cancel can accept NULL as its second argument, so for similarity, this patch extends genlmsg_cancel to be able to accept a NULL second argument as well. Signed-off-by: Julia Lawall <[email protected]> Signed-off-by: David S. Miller <[email protected]>
ambv · Feb 4, 2011 · 38db9e1 · 38db9e1
1 parent e2d5776
commit 38db9e1
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/include/net/genetlink.h b/include/net/genetlink.h
@@ -195,7 +195,8 @@ static inline int genlmsg_end(struct sk_buff *skb, void *hdr)
  */
 static inline void genlmsg_cancel(struct sk_buff *skb, void *hdr)
 {
-	nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
+	if (hdr)
+		nlmsg_cancel(skb, hdr - GENL_HDRLEN - NLMSG_HDRLEN);
 }
 
 /**