Phonet: restore flow control credits when sending fails

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index b2a3ae6cad78..5034f0f62bdb 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -834,6 +834,7 @@ static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
 {
         struct pep_sock *pn = pep_sk(sk);
         struct pnpipehdr *ph;
+        int err;
 
         if (pn_flow_safe(pn->tx_fc) &&
             !atomic_add_unless(&pn->tx_credits, -1, 0)) {
@@ -852,7 +853,10 @@ static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
                 ph->message_id = PNS_PIPE_DATA;
         ph->pipe_handle = pn->pipe_handle;
 
-        return pn_skb_send(sk, skb, &pipe_srv);
+        err = pn_skb_send(sk, skb, &pipe_srv);
+        if (err && pn_flow_safe(pn->tx_fc))
+                atomic_inc(&pn->tx_credits);
+        return err;
 }
 
 static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,