[Qemu-devel] [PULL 08/24] vl: change runstate only if new state is different from current state

[Paolo Bonzini]

From: Li Zhijian <address@hidden>

Previously, qemu will abort at following scenario:
(qemu) stop
(qemu) system_reset
(qemu) system_reset
(qemu) 2016-04-13T20:54:38.979158Z qemu-system-x86_64: invalid runstate 
transition: 'prelaunch' -> 'prelaunch'

Signed-off-by: Li Zhijian <address@hidden>
Acked-by: Paolo Bonzini <address@hidden>
Message-Id: <address@hidden>
Cc: address@hidden
Signed-off-by: Paolo Bonzini <address@hidden>
---
 vl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/vl.c b/vl.c
index b1562d8..2569dbb 100644
--- a/vl.c
+++ b/vl.c
@@ -690,6 +690,10 @@ void runstate_set(RunState new_state)
 {
     assert(new_state < RUN_STATE__MAX);
 
+    if (current_run_state == new_state) {
+        return;
+    }
+
     if (!runstate_valid_transitions[current_run_state][new_state]) {
         error_report("invalid runstate transition: '%s' -> '%s'",
                      RunState_lookup[current_run_state],
-- 
1.8.3.1