[PATCH] korina: fix loop back of receive descriptors

[Phil Sutter <n0-1@freewrt.org>]

After the last loop iteration, i has the value RC32434_NUM_RDS and
therefore leads to an index overflow when used afterwards to address the
last element. This is yet another another bug introduced when rewriting
parts of the driver for upstream preparation, as the original driver
used 'RC32434_NUM_RDS - 1' instead.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
---
 drivers/net/korina.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/korina.c b/drivers/net/korina.c
index 1d6e48e..67fbdf4 100644
--- a/drivers/net/korina.c
+++ b/drivers/net/korina.c
@@ -769,11 +769,12 @@ static void korina_alloc_ring(struct net_device *dev)
 		lp->rd_ring[i].link = CPHYSADDR(&lp->rd_ring[i+1]);
 	}
 
-	/* loop back */
-	lp->rd_ring[i].link = CPHYSADDR(&lp->rd_ring[0]);
-	lp->rx_next_done  = 0;
+	/* loop back receive descriptors, so the last
+	 * descriptor points to the first one */
+	lp->rd_ring[i - 1].link = CPHYSADDR(&lp->rd_ring[0]);
+	lp->rd_ring[i - 1].control |= DMA_DESC_COD;
 
-	lp->rd_ring[i].control |= DMA_DESC_COD;
+	lp->rx_next_done  = 0;
 	lp->rx_chain_head = 0;
 	lp->rx_chain_tail = 0;
 	lp->rx_chain_status = desc_empty;
-- 
1.5.6.4