diff options
| author | Linas Vepstas <linas@austin.ibm.com> | 2007-06-11 13:23:42 -0500 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-06-20 19:09:33 -0400 |
| commit | 2bf27a0d4913a5f0ef38e3be510b1b3add2869ad (patch) | |
| tree | 6644564484a6501d5f2adf2d296ce817b4a1fc6e /drivers/net/spider_net.c | |
| parent | 4c4bd5a97a87670d2c368ed4ed8a8f2c93080605 (diff) | |
| download | blackbird-obmc-linux-2bf27a0d4913a5f0ef38e3be510b1b3add2869ad.tar.gz blackbird-obmc-linux-2bf27a0d4913a5f0ef38e3be510b1b3add2869ad.zip | |
spidernet: Don't terminate the RX ring
The terminated RX ring will cause trouble during the RX ram full
conditions, leading to a hung driver, as the hardware can't find
the next descr. There is no real reason to terminate the RX ring;
it doesn't make the operation any smooother, and it does
require an extra sync. So don't do it.
Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net/spider_net.c')
| -rw-r--r-- | drivers/net/spider_net.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/net/spider_net.c b/drivers/net/spider_net.c index c99980a14203..f5ede5f6073c 100644 --- a/drivers/net/spider_net.c +++ b/drivers/net/spider_net.c @@ -460,13 +460,9 @@ spider_net_prepare_rx_descr(struct spider_net_card *card, hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE; } else { hwdescr->buf_addr = buf; - hwdescr->next_descr_addr = 0; wmb(); hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_NOINTR_COMPLETE; - - wmb(); - descr->prev->hwdescr->next_descr_addr = descr->bus_addr; } return 0; @@ -541,12 +537,16 @@ spider_net_refill_rx_chain(struct spider_net_card *card) static int spider_net_alloc_rx_skbs(struct spider_net_card *card) { - int result; - struct spider_net_descr_chain *chain; + struct spider_net_descr_chain *chain = &card->rx_chain; + struct spider_net_descr *start = chain->tail; + struct spider_net_descr *descr = start; - result = -ENOMEM; + /* Link up the hardware chain pointers */ + do { + descr->prev->hwdescr->next_descr_addr = descr->bus_addr; + descr = descr->next; + } while (descr != start); - chain = &card->rx_chain; /* Put at least one buffer into the chain. if this fails, * we've got a problem. If not, spider_net_refill_rx_chain * will do the rest at the end of this function. */ @@ -563,7 +563,7 @@ spider_net_alloc_rx_skbs(struct spider_net_card *card) error: spider_net_free_rx_chain_contents(card); - return result; + return -ENOMEM; } /** |
