netpoll: zap_completion_queue: adjust skb->users counter

zap_completion_queue() retrieves skbs from completion_queue where they have
zero skb->users counter.  Before dev_kfree_skb_any() it should be non-zero
yet, so it's increased now.

Reported-and-tested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 4b7e756181c9..c635de52526c 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -215,10 +215,12 @@ static void zap_completion_queue(void)
                 while (clist != NULL) {
                         struct sk_buff *skb = clist;
                         clist = clist->next;
-                        if (skb->destructor)
+                        if (skb->destructor) {
+                                atomic_inc(&skb->users);
                                 dev_kfree_skb_any(skb); /* put this one back */
-                        else
+                        } else {
                                 __kfree_skb(skb);
+                        }
                 }
         }