e1000: FIX: Stop raw interrupts disabled nag from RT

Current e1000_xmit_frame spews raw interrupt disabled nag messages when
used with RT kernel patches.  This patch uses spin_trylock_irqsave,
which allows RT patches to properly manage the irq semantics.

Signed-off-by: Mark Huth <mhuth@mvista.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 1 insertions, 4 deletions

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index dd66f8816b2f..eb3ff1ff746e 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -3378,12 +3378,9 @@ e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
             (adapter->hw.mac_type == e1000_82573))
                 e1000_transfer_dhcp_info(adapter, skb);
 
-        local_irq_save(flags);
-        if (!spin_trylock(&tx_ring->tx_lock)) {
+        if (!spin_trylock_irqsave(&tx_ring->tx_lock, flags))
                 /* Collision - tell upper layer to requeue */
-                local_irq_restore(flags);
                 return NETDEV_TX_LOCKED;
-        }
 
         /* need: count + 2 desc gap to keep tail from touching
          * head, otherwise try next time */