fixup timer: fixed time calculate

Signed-off-by: John Sanpe <[email protected]>

src/event/xdbd_timer.c

@@ -28,11 +28,7 @@ xdbd_first_timer(void)
     xdbd_timer_t *timer;
 
     node = BFDEV_HEAP_ROOT_NODE(&xdbd_timers);
-    if (node == NULL) {
-        return NULL;
-    }
-
-    timer = bfdev_heap_entry(node, xdbd_timer_t, node);
+    timer = bfdev_heap_entry_safe(node, xdbd_timer_t, node);
 
     return timer;
 }
@@ -54,16 +50,15 @@ xdbd_msec_t
 xdbd_first_timeout(void)
 {
     xdbd_timer_t *timer;
-    xdbd_msec_t timeout;
-    timer = xdbd_first_timer();
 
-    if (timer == NULL) {
+    timer = xdbd_first_timer();
+    if (timer == NULL)
         return XDBD_TIMER_INFINITE;
-    }
 
-    timeout = timer->time - xdbd_current_msec;
+    if (timer->time <= xdbd_current_msec)
+        return 0;
 
-    return (xdbd_msec_t) (timeout > 0 ? timeout : 0);
+    return timer->time - xdbd_current_msec;
 }
 
 int
@@ -81,6 +76,7 @@ xdbd_expire_timers(void)
         timer = xdbd_first_timer();
         xdbd_remove_timer(timer);
 
+        BFDEV_BUG_ON(!timer->func);
         retval = timer->func(timer, timer->pdata);
         if (retval)
             return retval;