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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: Alexey Demin <bf53x@ya.ru> Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -651,6 +651,12 @@ static void bf537mac_rx(struct net_device *dev)
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current_rx_ptr->skb = new_skb;
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current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
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/* Invidate the data cache of skb->data range when it is write back
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* cache. It will prevent overwritting the new data from DMA
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*/
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blackfin_dcache_invalidate_range((unsigned long)new_skb->head,
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(unsigned long)new_skb->end);
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len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
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skb_put(skb, len);
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blackfin_dcache_invalidate_range((unsigned long)skb->head,
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