From ad9505aae7f867c81ba97ba85fce801d1945ea9a Mon Sep 17 00:00:00 2001
From: Attilio Rao <attilio@FreeBSD.org>
Date: Thu, 27 Dec 2012 12:53:46 +0000
Subject: [PATCH] Remove an unused var.

Sponsored by:	EMC / Isilon storage division
MFC after:	3 days
---
 sys/sys/buf_ring.h | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/sys/sys/buf_ring.h b/sys/sys/buf_ring.h
index b33fc4776a8d..66f1607b64a2 100644
--- a/sys/sys/buf_ring.h
+++ b/sys/sys/buf_ring.h
@@ -77,7 +77,6 @@ buf_ring_enqueue(struct buf_ring *br, void *buf)
 {
 	uint32_t prod_head, prod_next;
 	uint32_t cons_tail;
-	int success;
 #ifdef DEBUG_BUFRING
 	int i;
 	for (i = br->br_cons_head; i != br->br_prod_head;
@@ -98,10 +97,7 @@ buf_ring_enqueue(struct buf_ring *br, void *buf)
 			critical_exit();
 			return (ENOBUFS);
 		}
-		
-		success = atomic_cmpset_int(&br->br_prod_head, prod_head,
-		    prod_next);
-	} while (success == 0);
+	} while (!atomic_cmpset_int(&br->br_prod_head, prod_head, prod_next));
 #ifdef DEBUG_BUFRING
 	if (br->br_ring[prod_head] != NULL)
 		panic("dangling value in enqueue");