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net: ethernet: mediatek: enhance the locking using the lightweight ones 

Since these critical sections protected by page_lock are all entered
from the user context or bottom half context, they can be replaced
with the spin_lock() or spin_lock_bh instead of spin_lock_irqsave().

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Acked-by: John Crispin <john@phrozen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sean Wang 2016-08-11 17:51:00 +08:00 committed by David S. Miller
parent 1738cd3ed3
commit e3e9652a43
1 changed files with 8 additions and 11 deletions
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19
drivers/net/ethernet/mediatek/mtk_eth_soc.c
View File

@ -353,18 +353,17 @@ static int mtk_set_mac_address(struct net_device *dev, void *p)
int ret = eth_mac_addr(dev, p);
struct mtk_mac *mac = netdev_priv(dev);
const char *macaddr = dev->dev_addr;
unsigned long flags;
if (ret)
return ret;
spin_lock_irqsave(&mac->hw->page_lock, flags);
spin_lock_bh(&mac->hw->page_lock);
mtk_w32(mac->hw, (macaddr[0] << 8) | macaddr[1],
MTK_GDMA_MAC_ADRH(mac->id));
mtk_w32(mac->hw, (macaddr[2] << 24) | (macaddr[3] << 16) |
(macaddr[4] << 8) | macaddr[5],
MTK_GDMA_MAC_ADRL(mac->id));
spin_unlock_irqrestore(&mac->hw->page_lock, flags);
spin_unlock_bh(&mac->hw->page_lock);
return 0;
}
@ -748,7 +747,6 @@ static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
struct mtk_eth *eth = mac->hw;
struct mtk_tx_ring *ring = &eth->tx_ring;
struct net_device_stats *stats = &dev->stats;
unsigned long flags;
bool gso = false;
int tx_num;
@ -756,14 +754,14 @@ static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
* however we have 2 queues running on the same ring so we need to lock
* the ring access
*/
spin_lock_irqsave(&eth->page_lock, flags);
spin_lock(&eth->page_lock);
tx_num = mtk_cal_txd_req(skb);
if (unlikely(atomic_read(&ring->free_count) <= tx_num)) {
mtk_stop_queue(eth);
netif_err(eth, tx_queued, dev,
"Tx Ring full when queue awake!\n");
spin_unlock_irqrestore(&eth->page_lock, flags);
spin_unlock(&eth->page_lock);
return NETDEV_TX_BUSY;
}
@ -788,12 +786,12 @@ static int mtk_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (unlikely(atomic_read(&ring->free_count) <= ring->thresh))
mtk_stop_queue(eth);
spin_unlock_irqrestore(&eth->page_lock, flags);
spin_unlock(&eth->page_lock);
return NETDEV_TX_OK;
drop:
spin_unlock_irqrestore(&eth->page_lock, flags);
spin_unlock(&eth->page_lock);
stats->tx_dropped++;
dev_kfree_skb(skb);
return NETDEV_TX_OK;
@ -1347,16 +1345,15 @@ static int mtk_open(struct net_device *dev)
static void mtk_stop_dma(struct mtk_eth *eth, u32 glo_cfg)
{
unsigned long flags;
u32 val;
int i;
/* stop the dma engine */
spin_lock_irqsave(&eth->page_lock, flags);
spin_lock_bh(&eth->page_lock);
val = mtk_r32(eth, glo_cfg);
mtk_w32(eth, val & ~(MTK_TX_WB_DDONE | MTK_RX_DMA_EN | MTK_TX_DMA_EN),
glo_cfg);
spin_unlock_irqrestore(&eth->page_lock, flags);
spin_unlock_bh(&eth->page_lock);
/* wait for dma stop */
for (i = 0; i < 10; i++) {