[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>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c
index 0eeff1add882..d779a0b9d456 100644
--- 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;