diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1dc2ab0cba..1f7aed035d 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2015-11-17  Yao Qi  <yao.qi@linaro.org>
+
+	* infrun.c (resume): Check control.trap_expected only
+	when deciding the set of threads to resume.
+
 2015-11-17  Pedro Alves  <palves@redhat.com>
 
 	* cp-namespace.c (cp_lookup_bare_symbol)
diff --git a/gdb/infrun.c b/gdb/infrun.c
index d1b0e128ab..b14f34cbc0 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -2656,14 +2656,17 @@ resume (enum gdb_signal sig)
   gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step));
 
   /* Decide the set of threads to ask the target to resume.  */
-  if ((step || thread_has_single_step_breakpoints_set (tp))
-      && tp->control.trap_expected)
+  if (tp->control.trap_expected)
     {
       /* We're allowing a thread to run past a breakpoint it has
-	 hit, by single-stepping the thread with the breakpoint
-	 removed.  In which case, we need to single-step only this
-	 thread, and keep others stopped, as they can miss this
-	 breakpoint if allowed to run.  */
+	 hit, either by single-stepping the thread with the breakpoint
+	 removed, or by displaced stepping, with the breakpoint inserted.
+	 In the former case, we need to single-step only this thread,
+	 and keep others stopped, as they can miss this breakpoint if
+	 allowed to run.  That's not really a problem for displaced
+	 stepping, but, we still keep other threads stopped, in case
+	 another thread is also stopped for a breakpoint waiting for
+	 its turn in the displaced stepping queue.  */
       resume_ptid = inferior_ptid;
     }
   else