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Date: Wed, 30 Jan 2008 16:52:27 +0800 From: Bryan Wu <bryan.wu@...log.com> To: jeff@...zik.org, netdev@...r.kernel.org Cc: linux-kernel@...r.kernel.org, Alexey Demin <bf53x@...ru>, Bryan Wu <bryan.wu@...log.com> Subject: [PATCH 7/8] [Blackfin] EMAC driver: fix bug - invalidate data cache of new_skb->data range when cache is WB From: Alexey Demin <bf53x@...ru> It prevents overwritting new data from DMA. Signed-off-by: Alexey Demin <bf53x@...ru> Signed-off-by: Bryan Wu <bryan.wu@...log.com> --- drivers/net/bfin_mac.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c index f2368b7..0a17fb4 100644 --- a/drivers/net/bfin_mac.c +++ b/drivers/net/bfin_mac.c @@ -651,6 +651,12 @@ static void bf537mac_rx(struct net_device *dev) current_rx_ptr->skb = new_skb; current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2; + /* Invidate the data cache of skb->data range when it is write back + * cache. It will prevent overwritting the new data from DMA + */ + blackfin_dcache_invalidate_range((unsigned long)new_skb->head, + (unsigned long)new_skb->end); + len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN); skb_put(skb, len); blackfin_dcache_invalidate_range((unsigned long)skb->head, -- 1.5.3.4 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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