2 files changed, 32 insertions, 45 deletions

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 5d1079b1838c..1823b7c63156 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1463,7 +1463,7 @@ void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
 }
 
 static int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
-                                                     struct nlmsghdr *, int *))
+                                                     struct nlmsghdr *))
 {
         struct nlmsghdr *nlh;
         int err;
@@ -1483,13 +1483,11 @@ static int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
                 if (nlh->nlmsg_type < NLMSG_MIN_TYPE)
                         goto skip;
 
-                if (cb(skb, nlh, &err) < 0) {
-                        /* Not an error, but we have to interrupt processing
-                         * here. Note: that in this case we do not pull
-                         * message from skb, it will be processed later.
-                         */
-                        if (err == 0)
-                                return -1;
+                err = cb(skb, nlh);
+                if (err == -EINTR) {
+                        /* Not an error, but we interrupt processing */
+                        netlink_queue_skip(nlh, skb);
+                        return err;
                 }
 skip:
                 if (nlh->nlmsg_flags & NLM_F_ACK || err)
@@ -1515,9 +1513,14 @@ skip:
  *
  * qlen must be initialized to 0 before the initial entry, afterwards
  * the function may be called repeatedly until qlen reaches 0.
+ *
+ * The callback function may return -EINTR to signal that processing
+ * of netlink messages shall be interrupted. In this case the message
+ * currently being processed will NOT be requeued onto the receive
+ * queue.
  */
 void netlink_run_queue(struct sock *sk, unsigned int *qlen,
-                       int (*cb)(struct sk_buff *, struct nlmsghdr *, int *))
+                       int (*cb)(struct sk_buff *, struct nlmsghdr *))
 {
         struct sk_buff *skb;
 
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 95391e609046..1b897bc92e61 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -295,60 +295,49 @@ int genl_unregister_family(struct genl_family *family)
         return -ENOENT;
 }
 
-static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
-                               int *errp)
+static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 {
         struct genl_ops *ops;
         struct genl_family *family;
         struct genl_info info;
         struct genlmsghdr *hdr = nlmsg_data(nlh);
-        int hdrlen, err = -EINVAL;
+        int hdrlen, err;
 
         family = genl_family_find_byid(nlh->nlmsg_type);
-        if (family == NULL) {
-                err = -ENOENT;
-                goto errout;
-        }
+        if (family == NULL)
+                return -ENOENT;
 
         hdrlen = GENL_HDRLEN + family->hdrsize;
         if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
-                goto errout;
+                return -EINVAL;
 
         ops = genl_get_cmd(hdr->cmd, family);
-        if (ops == NULL) {
-                err = -EOPNOTSUPP;
-                goto errout;
-        }
+        if (ops == NULL)
+                return -EOPNOTSUPP;
 
-        if ((ops->flags & GENL_ADMIN_PERM) && security_netlink_recv(skb, CAP_NET_ADMIN)) {
-                err = -EPERM;
-                goto errout;
-        }
+        if ((ops->flags & GENL_ADMIN_PERM) &&
+            security_netlink_recv(skb, CAP_NET_ADMIN))
+                return -EPERM;
 
         if (nlh->nlmsg_flags & NLM_F_DUMP) {
-                if (ops->dumpit == NULL) {
-                        err = -EOPNOTSUPP;
-                        goto errout;
-                }
+                if (ops->dumpit == NULL)
+                        return -EOPNOTSUPP;
 
-                *errp = err = netlink_dump_start(genl_sock, skb, nlh,
-                                                 ops->dumpit, ops->done);
+                err = netlink_dump_start(genl_sock, skb, nlh,
+                                         ops->dumpit, ops->done);
                 if (err == 0)
-                        skb_pull(skb, min(NLMSG_ALIGN(nlh->nlmsg_len),
-                                          skb->len));
-                return -1;
+                        err = -EINTR;
+                return err;
         }
 
-        if (ops->doit == NULL) {
-                err = -EOPNOTSUPP;
-                goto errout;
-        }
+        if (ops->doit == NULL)
+                return -EOPNOTSUPP;
 
         if (family->attrbuf) {
                 err = nlmsg_parse(nlh, hdrlen, family->attrbuf, family->maxattr,
                                   ops->policy);
                 if (err < 0)
-                        goto errout;
+                        return err;
         }
 
         info.snd_seq = nlh->nlmsg_seq;
@@ -358,12 +347,7 @@ static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
         info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN;
         info.attrs = family->attrbuf;
 
-        *errp = err = ops->doit(skb, &info);
-        return err;
-
-errout:
-        *errp = err;
-        return -1;
+        return ops->doit(skb, &info);
 }
 
 static void genl_rcv(struct sock *sk, int len)