[PATCH] make ctrl_if.c can be used in para-driver for unmodified guest

[Xiaofeng Ling <xiaofeng.ling@intel.com>]

make ctrl_if.c can be used in para-driver for unmodified guest
changes are:
1. use bind_evtchn_to_irqhandler instead of setup_irq
2. set safe_to_schedule_task = 1 in ctrl_if_init
3. remove warnings when build.
#ifndef CONFIG_XEN means build with unmodified kernel not xen-linux.
xen_start_info.domain_controller_evtchn is set in event channel
pci driver.
This file is needed for the front end drivers that is not ported to
xenbus.

Signed-off-by: Xiaofeng Ling <xiaofeng.ling@intel.com>
Signed-off-by: Arun Sharma <arun.sharma@intel.com>

diff -r 287d36b46fa3 linux-2.6-xen-sparse/arch/xen/kernel/ctrl_if.c
--- a/linux-2.6-xen-sparse/arch/xen/kernel/ctrl_if.c	Tue Aug 30 20:36:49 
2005
+++ b/linux-2.6-xen-sparse/arch/xen/kernel/ctrl_if.c	Fri Sep  2 22:47:27 
2005
@@ -67,10 +67,11 @@
  int initdom_ctrlif_domcontroller_port = -1;

  static int        ctrl_if_evtchn;
+#ifdef CONFIG_XEN
  static int        ctrl_if_irq;
+static struct irqaction ctrl_if_irq_action;
+#endif
  static spinlock_t ctrl_if_lock;
-
-static struct irqaction ctrl_if_irq_action;

  static ctrl_front_ring_t ctrl_if_tx_ring;
  static ctrl_back_ring_t  ctrl_if_rx_ring;
@@ -475,8 +476,12 @@

  void ctrl_if_suspend(void)
  {
+#ifdef CONFIG_XEN
      teardown_irq(ctrl_if_irq, &ctrl_if_irq_action);
      unbind_evtchn_from_irq(ctrl_if_evtchn);
+#else
+    unbind_evtchn_from_irqhandler(ctrl_if_evtchn, NULL);
+#endif
  }

  void ctrl_if_resume(void)
@@ -510,12 +515,22 @@
      BACK_RING_ATTACH(&ctrl_if_rx_ring, &ctrl_if->rx_ring, 
CONTROL_RING_MEM);

      ctrl_if_evtchn = xen_start_info.domain_controller_evtchn;
+#ifdef CONFIG_XEN
      ctrl_if_irq    = bind_evtchn_to_irq(ctrl_if_evtchn);

      memset(&ctrl_if_irq_action, 0, sizeof(ctrl_if_irq_action));
      ctrl_if_irq_action.handler = ctrl_if_interrupt;
      ctrl_if_irq_action.name    = "ctrl-if";
      (void)setup_irq(ctrl_if_irq, &ctrl_if_irq_action);
+#else
+    if(bind_evtchn_to_irqhandler(
+        ctrl_if_evtchn, ctrl_if_interrupt, SA_SAMPLE_RANDOM, "ctrl-if", 
NULL))
+    {
+        printk("bind_evtchn_to_irqhandler failed\n" );
+        return;
+    }
+
+#endif
  }

  void __init ctrl_if_init(void)
@@ -532,6 +547,9 @@
      spin_lock_init(&ctrl_if_lock);

      ctrl_if_resume();
+#ifndef CONFIG_XEN
+    safe_to_schedule_task = 1;
+#endif
  }