netdev - [PATCH 4/4] Phonet: restore flow control credits when sending fails

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Date:	Thu, 30 Sep 2010 13:55:05 +0530
From:	Kumar A Sanghvi <kumar.sanghvi@...ricsson.com>
To:	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	<remi.denis-courmont@...ia.com>, <eric.dumazet@...il.com>
Cc:	<gulshan.karmani@...ricsson.com>,
	Kumar Sanghvi <kumar.sanghvi@...ricsson.com>,
	Linus Walleij <linus.walleij@...ricsson.com>
Subject: [PATCH 4/4] Phonet: restore flow control credits when sending fails

From: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>

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@...ia.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@...ia.com>
	Signed-off-by: David S. Miller <davem@...emloft.net>

Signed-off-by: Kumar Sanghvi <kumar.sanghvi@...ricsson.com>
Acked-by: Linus Walleij <linus.walleij@...ricsson.com>
---
 net/phonet/pep.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index 9746c6d..aa3d870 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -1289,6 +1289,7 @@ 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,
@@ -1315,10 +1316,15 @@ 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,
-- 
1.7.2.dirty

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