From: Linas Vepstas Make the hardware perceive the RX descriptor ring as a null-terminated linked list, instead of a circular ring. Signed-off-by: Linas Vepstas Cc: James K Lewis Cc: Arnd Bergmann Signed-off-by: Andrew Morton --- drivers/net/spider_net.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff -puN drivers/net/spider_net.c~spidernet-rework-rx-linked-list drivers/net/spider_net.c --- a/drivers/net/spider_net.c~spidernet-rework-rx-linked-list +++ a/drivers/net/spider_net.c @@ -389,9 +389,13 @@ spider_net_prepare_rx_descr(struct spide 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; @@ -1676,12 +1680,6 @@ spider_net_open(struct net_device *netde + card->num_tx_desc * sizeof(struct spider_net_descr), card->num_rx_desc); - descr = card->rx_chain.head; - do { - descr->next_descr_addr = descr->next->bus_addr; - descr = descr->next; - } while (descr != card->rx_chain.head); - /* allocate rx skbs */ if (spider_net_alloc_rx_skbs(card)) goto alloc_skbs_failed; _