[PATCH] powerpc/cell spidernet incorrect offset

Bugfix -- the rx chain is in memory after the tx chain --
the offset being used was wrong, resulting in memory corruption
when the size of the rx and tx rings weren't exactly the same.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Cc: James K Lewis <jklewis@us.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index 0eeff1a..d779a0b 100644 (file)
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -1628,8 +1628,10 @@ spider_net_open(struct net_device *netdev)
        if (spider_net_init_chain(card, &card->tx_chain, card->descr,
                        PCI_DMA_TODEVICE, card->tx_desc))
                goto alloc_tx_failed;
+
+       /* rx_chain is after tx_chain, so offset is descr + tx_count */
        if (spider_net_init_chain(card, &card->rx_chain,
-                       card->descr + card->rx_desc,
+                       card->descr + card->tx_desc,
                        PCI_DMA_FROMDEVICE, card->rx_desc))
                goto alloc_rx_failed;