Two things:
 - mbus can be NULL (in case of bus removal while reader is reading)
 - Remove a useless assignment

Signed-off-by: Pete Zaitcev <[EMAIL PROTECTED]>

diff -urp -X dontdiff linux-2.6.23-rc3-gregkh/drivers/usb/mon/mon_main.c 
linux-2.6.23-rc3-gregkh-pipe/drivers/usb/mon/mon_main.c
--- linux-2.6.23-rc3-gregkh/drivers/usb/mon/mon_main.c  2007-08-13 
22:44:06.000000000 -0700
+++ linux-2.6.23-rc3-gregkh-pipe/drivers/usb/mon/mon_main.c     2007-08-14 
00:15:39.000000000 -0700
@@ -148,18 +148,8 @@ static void mon_complete(struct usb_bus 
 {
        struct mon_bus *mbus;
 
-       mbus = ubus->mon_bus;
-       if (mbus == NULL) {
-               /*
-                * This should not happen.
-                * At this point we do not even know the bus number...
-                */
-               printk(KERN_ERR TAG ": Null mon bus in URB, address %p\n",
-                   urb);
-               return;
-       }
-
-       mon_bus_complete(mbus, urb);
+       if ((mbus = ubus->mon_bus) != NULL)
+               mon_bus_complete(mbus, urb);
        mon_bus_complete(&mon_bus0, urb);
 }
 
@@ -170,7 +160,7 @@ static void mon_complete(struct usb_bus 
  */
 static void mon_stop(struct mon_bus *mbus)
 {
-       struct usb_bus *ubus = mbus->u_bus;
+       struct usb_bus *ubus;
        struct list_head *p;
 
        if (mbus == &mon_bus0) {

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