drivers/rptun: check the status before stop remote proc

Race condition if the remote proc is stoped during initialization phase

| #0  0x0249f959 in rpmsg_destroy_ept (ept=0xffffffc0) at open-amp/lib/rpmsg/rpmsg.c:376
| #1  0x024a938c in rpmsg_deinit_vdev (rvdev=0xf2303a48) at open-amp/lib/rpmsg/rpmsg_virtio.c:971
| #2  0x02117e33 in rptun_dev_stop (rproc=0xf2303a04, stop_ns=true) at rptun/rptun.c:891
| apache#3  0x021181d8 in rptun_do_ioctl (priv=0xf2303a00, cmd=11010, arg=0) at rptun/rptun.c:922
| apache#4  0x02119722 in rptun_ioctl_foreach (cpuname=0x0, cmd=11010, value=0) at rptun/rptun.c:1086
| apache#5  0x0211b9df in rptun_poweroff (cpuname=0x0) at rptun/rptun.c:1378
| apache#6  0x02053aa6 in board_power_off (status=0) at sim/sim_head.c:206
| apache#7  0x0253d65c in boardctl (cmd=65283, arg=0) at boardctl.c:400
| apache#8  0x021eb497 in cmd_poweroff (vtbl=0xef606280, argc=1, argv=0xef9b73e0) at nsh_syscmds.c:356
| apache#9  0x021cdb4d in nsh_command (vtbl=0xef606280, argc=1, argv=0xef9b73e0) at nsh_command.c:1164
| apache#10 0x021baa72 in nsh_execute (vtbl=0xef606280, argc=1, argv=0xef9b73e0, redirfile=0x0, oflags=0) at nsh_parse.c:845
| apache#11 0x021c6b0a in nsh_parse_command (vtbl=0xef606280, cmdline=0xef606708 "poweroff") at nsh_parse.c:2744
| apache#12 0x021c7166 in nsh_parse (vtbl=0xef606280, cmdline=0xef606708 "poweroff") at nsh_parse.c:2828
| apache#13 0x0221fa2f in nsh_session (pstate=0xef606280, login=1, argc=1, argv=0xef7a7860) at nsh_session.c:245
| apache#14 0x021f8c04 in nsh_consolemain (argc=1, argv=0xef7a7860) at nsh_consolemain.c:75
| apache#15 0x021b77eb in nsh_main (argc=1, argv=0xef7a7860) at nsh_main.c:74
| apache#16 0x02166ddf in nxtask_startup (entrypt=0x21b76ca <nsh_main>, argc=1, argv=0xef7a7860) at sched/task_startup.c:70
| apache#17 0x020b363c in nxtask_start () at task/task_start.c:134

Signed-off-by: chao an <anchao@xiaomi.com>

Author: anchao

drivers/rptun/rptun.c

@@ -756,6 +756,16 @@ static int rptun_dev_stop(FAR struct remoteproc *rproc, bool stop_ns)
   FAR struct metal_list *tmp;
   FAR struct rptun_cb_s *cb;
 
+  if (priv->rproc.state == RPROC_OFFLINE)
+    {
+      return OK;
+    }
+  else if (priv->rproc.state == RPROC_CONFIGURED ||
+           priv->rproc.state == RPROC_READY)
+    {
+      return -EBUSY;
+    }
+
   rdev->support_ns = stop_ns;
 
 #ifdef CONFIG_RPTUN_PING
@@ -805,7 +815,7 @@ static int rptun_dev_stop(FAR struct remoteproc *rproc, bool stop_ns)
 
   remoteproc_shutdown(rproc);
 
-  return 0;
+  return OK;
 }
 
 static int rptun_do_ioctl(FAR struct rptun_priv_s *priv, int cmd,
@@ -818,19 +828,19 @@ static int rptun_do_ioctl(FAR struct rptun_priv_s *priv, int cmd,
       case RPTUNIOC_START:
         if (priv->rproc.state == RPROC_OFFLINE)
           {
-            rptun_dev_start(&priv->rproc);
+            ret = rptun_dev_start(&priv->rproc);
           }
         else
           {
-            rptun_dev_stop(&priv->rproc, false);
-            rptun_dev_start(&priv->rproc);
+            ret = rptun_dev_stop(&priv->rproc, false);
+            if (ret == OK)
+              {
+                ret = rptun_dev_start(&priv->rproc);
+              }
           }
         break;
       case RPTUNIOC_STOP:
-        if (priv->rproc.state != RPROC_OFFLINE)
-          {
-            rptun_dev_stop(&priv->rproc, true);
-          }
+        ret = rptun_dev_stop(&priv->rproc, true);
         break;
       case RPTUNIOC_RESET:
         RPTUN_RESET(priv->dev, arg);