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vl: change runstate only if new state is different from current state

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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 <lizhijian@cn.fujitsu.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1460604352-18630-1-git-send-email-lizhijian@cn.fujitsu.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Li Zhijian 2016-04-14 11:25:52 +08:00 committed by Paolo Bonzini
parent ed1263c363
commit e92a2d9cb3
1 changed files with 4 additions and 0 deletions
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vl.c
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@ -690,6 +690,10 @@ void runstate_set(RunState new_state)
{ {
assert(new_state < RUN_STATE__MAX); assert(new_state < RUN_STATE__MAX);
if (current_run_state == new_state) {
return;
}
if (!runstate_valid_transitions[current_run_state][new_state]) { if (!runstate_valid_transitions[current_run_state][new_state]) {
error_report("invalid runstate transition: '%s' -> '%s'", error_report("invalid runstate transition: '%s' -> '%s'",
RunState_lookup[current_run_state], RunState_lookup[current_run_state],