[PATCHv4 11/11] Phonet: Use *_dec_not_zero instead of *_add_unless

[Sven Eckelmann <sven@narfation.org>]

atomic_dec_not_zero is defined for each architecture through
<linux/atomic.h> to provide the functionality of
atomic_add_unless(x, -1, 0).

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Cc: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
---
 net/phonet/pep.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index f17fd84..b192c83 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -1013,7 +1013,7 @@ static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
 	int err;
 
 	if (pn_flow_safe(pn->tx_fc) &&
-	    !atomic_add_unless(&pn->tx_credits, -1, 0)) {
+	    !atomic_dec_not_zero(&pn->tx_credits)) {
 		kfree_skb(skb);
 		return -ENOBUFS;
 	}
-- 
1.7.5.4