qemu-timer: introduce timer_deinit

In some cases, a timer was set to NULL so that we could check if it is
initialized.  Use the timer_list field instead, and add a timer_deinit
function that NULLs it.

It then makes sense that timer_del be a no-op (instead of a crasher) on
such a de-initialized timer.  It avoids the need to poke at the timerlist
field to check if the timers are initialized.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/qemu-timer.c b/qemu-timer.c
index 98d9d1bc0b..464396f7d0 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -342,6 +342,12 @@ void timer_init_tl(QEMUTimer *ts,
     ts->expire_time = -1;
 }
 
+void timer_deinit(QEMUTimer *ts)
+{
+    assert(ts->expire_time == -1);
+    ts->timer_list = NULL;
+}
+
 void timer_free(QEMUTimer *ts)
 {
     g_free(ts);
@@ -398,9 +404,11 @@ void timer_del(QEMUTimer *ts)
 {
     QEMUTimerList *timer_list = ts->timer_list;
 
-    qemu_mutex_lock(&timer_list->active_timers_lock);
-    timer_del_locked(timer_list, ts);
-    qemu_mutex_unlock(&timer_list->active_timers_lock);
+    if (timer_list) {
+        qemu_mutex_lock(&timer_list->active_timers_lock);
+        timer_del_locked(timer_list, ts);
+        qemu_mutex_unlock(&timer_list->active_timers_lock);
+    }
 }
 
 /* modify the current timer so that it will be fired when current_time