diff options
| author | Linas Vepstas <linas@austin.ibm.com> | 2007-02-05 16:29:43 -0800 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-02-07 18:48:56 -0500 |
| commit | d9a9720eab7437aa7f34dcbb92bb4bc8cc36bba9 (patch) | |
| tree | 868fe3a6310f3fdb34328c887d006e9f406d671e /drivers | |
| parent | b7e36bfa9ffa2f6097b622ba07a95d823db553e4 (diff) | |
Spidernet: Rework RX linked list
Make the hardware perceive the RX descriptor ring as a null-terminated linked
list, instead of a circular ring.
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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/spider_net.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c index d73018b5cfc..bf6ff39e02b 100644 --- a/drivers/net/spider_net.c +++ b/drivers/net/spider_net.c @@ -419,9 +419,13 @@ spider_net_prepare_rx_descr(struct spider_net_card *card, card->spider_stats.rx_iommu_map_error++; descr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; } else { + descr->next_descr_addr = 0; wmb(); descr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_NOINTR_COMPLETE; + + wmb(); + descr->prev->next_descr_addr = descr->bus_addr; } return 0; @@ -1650,7 +1654,6 @@ int spider_net_open(struct net_device *netdev) { struct spider_net_card *card = netdev_priv(netdev); - struct spider_net_descr *descr; int result; result = spider_net_init_chain(card, &card->tx_chain); @@ -1662,13 +1665,6 @@ spider_net_open(struct net_device *netdev) if (result) goto alloc_rx_failed; - /* Make a ring of of bus addresses */ - descr = card->rx_chain.ring; - do { - descr->next_descr_addr = descr->next->bus_addr; - descr = descr->next; - } while (descr != card->rx_chain.ring); - /* Allocate rx skbs */ if (spider_net_alloc_rx_skbs(card)) goto alloc_skbs_failed; |