1 files changed, 35 insertions, 3 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index b5760c67af9c..067b9ccafd87 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -407,7 +407,7 @@ struct net_device
  * One part is mostly used on xmit path (device)
  */
         /* hard_start_xmit synchronizer */
-        spinlock_t              xmit_lock ____cacheline_aligned_in_smp;
+        spinlock_t              _xmit_lock ____cacheline_aligned_in_smp;
         /* cpu id of processor entered to hard_start_xmit or -1,
            if nobody entered there.
          */
@@ -893,11 +893,43 @@ static inline void __netif_rx_complete(struct net_device *dev)
         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 }
 
+static inline void netif_tx_lock(struct net_device *dev)
+{
+        spin_lock(&dev->_xmit_lock);
+        dev->xmit_lock_owner = smp_processor_id();
+}
+
+static inline void netif_tx_lock_bh(struct net_device *dev)
+{
+        spin_lock_bh(&dev->_xmit_lock);
+        dev->xmit_lock_owner = smp_processor_id();
+}
+
+static inline int netif_tx_trylock(struct net_device *dev)
+{
+        int err = spin_trylock(&dev->_xmit_lock);
+        if (!err)
+                dev->xmit_lock_owner = smp_processor_id();
+        return err;
+}
+
+static inline void netif_tx_unlock(struct net_device *dev)
+{
+        dev->xmit_lock_owner = -1;
+        spin_unlock(&dev->_xmit_lock);
+}
+
+static inline void netif_tx_unlock_bh(struct net_device *dev)
+{
+        dev->xmit_lock_owner = -1;
+        spin_unlock_bh(&dev->_xmit_lock);
+}
+
 static inline void netif_tx_disable(struct net_device *dev)
 {
-        spin_lock_bh(&dev->xmit_lock);
+        netif_tx_lock_bh(dev);
         netif_stop_queue(dev);
-        spin_unlock_bh(&dev->xmit_lock);
+        netif_tx_unlock_bh(dev);
 }
 
 /* These functions live elsewhere (drivers/net/net_init.c, but related) */