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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>
This commit is contained in:
Phil Sutter 2009-01-15 12:29:55 +00:00 committed by David S. Miller
parent eed087e367
commit 6a2fe9834e
1 changed files with 5 additions and 4 deletions
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9
drivers/net/korina.c
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@ -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;