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Commit 6e01d1a4 authored by Alexey Demin's avatar Alexey Demin Committed by David S. Miller
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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: default avatarAlexey Demin <bf53x@ya.ru>
Signed-off-by: default avatarBryan Wu <bryan.wu@analog.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 136492b2

drivers/net/bfin_mac.c

+6 −0
Original line number Diff line number Diff line
@@ -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,