Phonet: restore flow control credits when sending fails

This patch restores the below flow control patch submitted by Rémi
Denis-Courmont, which accidentaly got lost due to Pipe controller patch
on Phonet.

	commit 1a98214feef2221cd7c24b17cd688a5a9d85b2ea
	Author: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
	Date:   Mon Aug 30 12:57:03 2010 +0000

	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>

Signed-off-by: Kumar Sanghvi <kumar.sanghvi@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 2 deletions

diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index 7bf23cf36b02..552fb665645f 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -1288,6 +1288,7 @@ static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
 {
         struct pep_sock *pn = pep_sk(sk);
         struct pnpipehdr *ph;
+        int err;
 #ifdef CONFIG_PHONET_PIPECTRLR
         struct sockaddr_pn spn = {
                 .spn_family = AF_PHONET,
@@ -1314,10 +1315,15 @@ static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
                 ph->message_id = PNS_PIPE_DATA;
         ph->pipe_handle = pn->pipe_handle;
 #ifdef CONFIG_PHONET_PIPECTRLR
-        return pn_skb_send(sk, skb, &spn);
+        err = pn_skb_send(sk, skb, &spn);
 #else
-        return pn_skb_send(sk, skb, &pipe_srv);
+        err = pn_skb_send(sk, skb, &pipe_srv);
 #endif
+
+        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,