[PATCH] Improvev netconsole support for RTL8139 NIC driver

[yshi <yang.shi@windriver.com>]

In current RTL8139 NIC driver, spin_lock()/spin_unlock() is used
for irq handler. But for netconsole/netpoll, it prefers
spin_lock_irqsave()/spin_unlcok_irqrestore(). So this patch fixed
this problem to improve netconsole/netpoll support.

Signed-off-by: Yang Shi <yang.shi@windriver.com>
---
 b/drivers/net/8139too.c |    9 +++++++++
 1 file changed, 9 insertions(+)
---

--- a/drivers/net/8139too.c
+++ b/drivers/net/8139too.c
@@ -2136,8 +2136,13 @@ static irqreturn_t rtl8139_interrupt (in
        u16 status, ackstat;
        int link_changed = 0; /* avoid bogus "uninit" warning */
        int handled = 0;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+       unsigned long flags;

+       spin_lock_irqsave (&tp->lock, flags);
+#else
        spin_lock (&tp->lock);
+#endif
        status = RTL_R16 (IntrStatus);

        /* shared irq? */
@@ -2185,7 +2190,11 @@ static irqreturn_t rtl8139_interrupt (in
                        RTL_W16 (IntrStatus, TxErr);
        }
  out:
+#ifdef CONFIG_NET_POLL_CONTROLLER
+       spin_unlock_irqrestore (&tp->lock, flags);
+#else
        spin_unlock (&tp->lock);
+#endif

        DPRINTK ("%s: exiting interrupt, intr_status=%#4.4x.\n",
                 dev->name, RTL_R16 (IntrStatus));