[PATCH 2/2] use rtnl_lock_interruptible in 8139 to avoid shutdown hang

[Christoph Hellwig <hch@xxxxxx>]

The 8139too thread needs to use rtnl_lock_interruptible so it can avoid
doing the actual work once it's been kill_proc()ed on module removal
time.

Based on debugging and an earlier patch that adds a driver-private
semaphore from Herbert Xu.

--- 1.101/drivers/net/8139too.c 2004-10-30 02:00:00 +02:00
+++ edited/drivers/net/8139too.c        2005-01-09 12:55:31 +01:00
@@ -1636,7 +1636,8 @@
                if (tp->time_to_die)
                        break;
 
-               rtnl_lock ();
+               if (rtnl_lock_interruptible ())
+                       break;
                rtl8139_thread_iter (dev, tp, tp->mmio_addr);
                rtnl_unlock ();
        }