[PATCH 13/30] rt2x00: rt2x00_ring_free returns invalid length

[Ivo van Doorn <ivdoorn@gmail.com>]

>From 038b4a505c82c91a84caaf7832967ffac2faf93b Mon Sep 17 00:00:00 2001
From: Ivo van Doorn <IvDoorn@gmail.com>
Date: Sat, 18 Aug 2007 13:03:32 +0200
Subject: [PATCH 13/30] rt2x00: rt2x00_ring_free returns invalid length

rt2x00_ring_free returned the incorrect number of available
entries because it accidently used ring->stats.len minus
the number of used entries. This always results in 0 available entries,
obviously this in turn would lead to problems regarding the
TX handling.

We can fix and optimize the code quite simply by
doing the limit - length

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
---
 drivers/net/wireless/rt2x00ring.h |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/rt2x00ring.h b/drivers/net/wireless/rt2x00ring.h
index 2adc8e5..9c94d06 100644
--- a/drivers/net/wireless/rt2x00ring.h
+++ b/drivers/net/wireless/rt2x00ring.h
@@ -219,9 +219,7 @@ static inline int rt2x00_ring_full(struct data_ring *ring)
 
 static inline int rt2x00_ring_free(struct data_ring *ring)
 {
-	if (ring->index_done >= ring->index)
-		return ring->index_done - ring->index;
-	return ring->stats.len - (ring->index - ring->index_done);
+	return ring->stats.limit - ring->stats.len;
 }
 
 /*
-- 
1.5.3.rc5