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authorPhil Sutter <n0-1@freewrt.org>2009-01-15 12:29:55 +0000
committerDavid S. Miller <davem@davemloft.net>2009-01-19 16:23:00 -0800
commit6a2fe9834e578590f4a2fbe18a574465ab0e127c (patch)
tree0560c9a31716369e3b32dda6560e98d0a9322bd8 /drivers/net/korina.c
parenteed087e367591fc08490d7c6c2779b4b72c8f20c (diff)
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korina: fix loop back of receive descriptors
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> Acked-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/korina.c')
-rw-r--r--drivers/net/korina.c9
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;