forcedeth: tx locking

This patch reduces the amount of code within the lock to only the
critical sections.

Signed-Off-By: Ayaz Abdulla <aabdulla@nvidia.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index bea826b..75dbd67 100644 (file)
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -1569,12 +1569,11 @@ static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
                           ((skb_shinfo(skb)->frags[i].size & (NV_TX2_TSO_MAX_SIZE-1)) ? 1 : 0);
        }
 
-       spin_lock_irq(&np->lock);
-
        empty_slots = nv_get_empty_tx_slots(np);
        if ((empty_slots - np->tx_limit_stop) <= entries) {
-               spin_unlock_irq(&np->lock);
+               spin_lock_irq(&np->lock);
                netif_stop_queue(dev);
+               spin_unlock_irq(&np->lock);
                return NETDEV_TX_BUSY;
        }
 
@@ -1669,6 +1668,8 @@ static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
                tx_flags_vlan = NV_TX3_VLAN_TAG_PRESENT | vlan_tx_tag_get(skb);
        }
 
+       spin_lock_irq(&np->lock);
+
        /* set tx flags */
        if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
                start_tx.orig->flaglen |= cpu_to_le32(tx_flags | tx_flags_extra);
@@ -1679,6 +1680,7 @@ static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
                np->put_tx.ex = put_tx.ex;
        }
 
+       spin_unlock_irq(&np->lock);
 
        dprintk(KERN_DEBUG "%s: nv_start_xmit: entries %d queued for transmission. tx_flags_extra: %x\n",
                dev->name, entries, tx_flags_extra);
@@ -1693,7 +1695,6 @@ static int nv_start_xmit(struct sk_buff *skb, struct net_device *dev)
        }
 
        dev->trans_start = jiffies;
-       spin_unlock_irq(&np->lock);
        writel(NVREG_TXRXCTL_KICK|np->txrxctl_bits, get_hwbase(dev) + NvRegTxRxControl);
        pci_push(get_hwbase(dev));
        return NETDEV_TX_OK;