add RT_DEBUG_SCHEDULER_AVAILABLE check

1 files changed, 11 insertions, 1 deletions

diff --git a/components/dfs/filesystems/devfs/devfs.c b/components/dfs/filesystems/devfs/devfs.c
index d60f7ddc9b..8e58fb9f53 100644
--- a/components/dfs/filesystems/devfs/devfs.c
+++ b/components/dfs/filesystems/devfs/devfs.c
@@ -144,11 +144,15 @@ int dfs_device_fs_open(struct dfs_fd *file)
         {
             count ++;
         }
+        rt_exit_critical();
 
         root_dirent = (struct device_dirent *)rt_malloc(sizeof(struct device_dirent) +
                       count * sizeof(rt_device_t));
         if (root_dirent != RT_NULL)
         {
+            /* lock scheduler */
+            rt_enter_critical();
+
             root_dirent->devices = (rt_device_t *)(root_dirent + 1);
             root_dirent->read_index = 0;
             root_dirent->device_count = count;
@@ -156,12 +160,18 @@ int dfs_device_fs_open(struct dfs_fd *file)
             /* get all device node */
             for (node = information->object_list.next; node != &(information->object_list); node = node->next)
             {
+                /* avoid memory write through */
+                if (count == root_dirent->device_count)
+                {
+                    rt_kprintf("warning: There are newly added devices that are not displayed!");
+                    break;
+                }
                 object = rt_list_entry(node, struct rt_object, list);
                 root_dirent->devices[count] = (rt_device_t)object;
                 count ++;
             }
+            rt_exit_critical();
         }
-        rt_exit_critical();
 
         /* set data */
         file->data = root_dirent;