prevent available from going negative

rhs · Feb 9, 2011 · 5248899 · 5248899
1 parent 54cfbf7
commit 5248899
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/link.py b/link.py
@@ -293,7 +293,7 @@ def do_transfer(self, xfr):
     u = self._units(xfr)
     self.link_credit -= u
     self.transfer_count += u
-    self.available -= u
+    self.available = max(0, self.available - u)
 
   def do_flow_state(self, state):
     if self.transfer_count is not None: