device: protect device event broadcast against simultaneous deletions of multiple...

[project/netifd.git] / device.c

diff --git a/device.c b/device.c
index 97fb27f..9ef444e 100644 (file)
--- a/device.c
+++ b/device.c
@@ -183,14 +183,27 @@ static void __init dev_init(void)
 
 static void __device_broadcast_event(struct list_head *head, enum device_event ev)
 {
-       struct device_user *dep, *tmp;
+       struct device_user *dep;
+       static uint8_t idx[__DEV_EVENT_MAX];
+       bool found;
 
-       list_for_each_entry_safe(dep, tmp, head, list) {
-               if (!dep->cb)
-                       continue;
+       idx[ev]++;
+       do {
+               found = false;
 
-               dep->cb(dep, ev);
-       }
+               list_for_each_entry(dep, head, list) {
+                       if (!dep->cb)
+                               continue;
+
+                       if (dep->ev_idx[ev] == idx[ev])
+                               continue;
+
+                       dep->cb(dep, ev);
+                       dep->ev_idx[ev] = idx[ev];
+                       found = true;
+                       break;
+               }
+       } while (found);
 }
 
 void device_broadcast_event(struct device *dev, enum device_event ev)