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cns3xxx: fix ethernet driver memory barrier usage 

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35941 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
Felix Fietkau 2013-03-10 18:25:11 +00:00
parent 88643da3bf
commit 275672c3c9
1 changed files with 8 additions and 5 deletions
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13
target/linux/cns3xxx/files/drivers/net/ethernet/cavium/cns3xxx_eth.c
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@ -516,18 +516,20 @@ static void cns3xxx_alloc_rx_buf(struct sw *sw, int received)
for (received += rx_ring->alloc_count; received > 0; received--) {
buf = kzalloc(RX_SEGMENT_ALLOC_SIZE, GFP_ATOMIC);
if (!buf)
goto out;
break;
phys = dma_map_single(NULL, buf + SKB_HEAD_ALIGN,
RX_SEGMENT_MRU, DMA_FROM_DEVICE);
if (dma_mapping_error(NULL, phys)) {
kfree(buf);
goto out;
break;
}
desc->sdl = RX_SEGMENT_MRU;
desc->sdp = phys;
wmb();
/* put the new buffer on RX-free queue */
rx_ring->buff_tab[i] = buf;
rx_ring->phys_tab[i] = phys;
@ -543,7 +545,7 @@ static void cns3xxx_alloc_rx_buf(struct sw *sw, int received)
desc++;
}
}
out:
rx_ring->alloc_count = received;
rx_ring->alloc_index = i;
}
@ -713,6 +715,7 @@ static int eth_poll(struct napi_struct *napi, int budget)
enable_irq(IRQ_CNS3XXX_SW_R0RXC);
}
wmb();
enable_rx_dma(sw);
spin_lock_bh(&tx_lock);
@ -739,7 +742,7 @@ static void eth_set_desc(struct _tx_ring *tx_ring, int index, int index_last,
if (index == index_last)
config0 |= LAST_SEGMENT;
mb();
wmb();
tx_desc->config0 = config0;
}
@ -812,7 +815,7 @@ static int eth_xmit(struct sk_buff *skb, struct net_device *dev)
eth_set_desc(tx_ring, index0, index_last, skb->data, len0,
config0 | FIRST_SEGMENT, pmap);
mb();
wmb();
spin_lock(&tx_lock);
tx_ring->num_used += nr_desc + 1;