From 6e01d1a4b2f7110201e7fe16e561a721d76fab3e Mon Sep 17 00:00:00 2001 From: Alexey Demin Date: Wed, 30 Jan 2008 16:52:27 +0800 Subject: [PATCH] EMAC driver: fix bug - invalidate data cache of new_skb->data range when cache is WB It prevents overwritting new data from DMA. Signed-off-by: Alexey Demin Signed-off-by: Bryan Wu Signed-off-by: Jeff Garzik Signed-off-by: David S. Miller --- drivers/net/bfin_mac.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c index f2368b71a720..0a17fb48c55c 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, -- 2.20.1