sched/sched: Fix recursive watchdog handling

This commit fixed recursive watchdog handling caused by calling wd_start within watchdog timeout callback function.

Signed-off-by: ouyangxiangzhen <[email protected]>
Signed-off-by: ligd <[email protected]>

Author: Fix-Point

sched/sched/sched_timerexpiration.c

@@ -528,7 +528,9 @@ void nxsched_alarm_tick_expiration(clock_t ticks)
 
   /* Process the timer ticks and set up the next interval (or not) */
 
+  g_wdtimernested++;
   nexttime = nxsched_timer_process(ticks, elapsed, false);
+  g_wdtimernested--;
 
   nxsched_timer_start(nexttime);
 #ifdef CONFIG_SMP

sched/wdog/wd_initialize.c

@@ -39,6 +39,10 @@
 
 struct list_node g_wdactivelist = LIST_INITIAL_VALUE(g_wdactivelist);
 
+#ifdef CONFIG_SCHED_TICKLESS
+unsigned int g_wdtimernested;
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/

sched/wdog/wd_start.c

@@ -252,7 +252,7 @@ int wd_start_absolute(FAR struct wdog_s *wdog, clock_t ticks,
   wd_insert(wdog, ticks, wdentry, arg);
 
   reassess |= list_is_head(&g_wdactivelist, &wdog->node);
-  if (reassess)
+  if (!g_wdtimernested && reassess)
     {
       /* Resume the interval timer that will generate the next
        * interval event. If the timer at the head of the list changed,

sched/wdog/wdog.h

@@ -63,6 +63,10 @@ extern "C"
 
 extern struct list_node g_wdactivelist;
 
+#ifdef CONFIG_SCHED_TICKLESS
+extern unsigned int g_wdtimernested;
+#endif
+
 /****************************************************************************
  * Public Function Prototypes
  ****************************************************************************/