s390: avoid reaching into memory core internals

[qemu.git] / aio.c

diff --git a/aio.c b/aio.c
index 0a9eb10c76dc07c033560eab13b3eb5dded059b2..c738a4e15d6487a9083cdc728fc08ff8e78d9b58 100644 (file)
--- a/aio.c
+++ b/aio.c
@@ -119,7 +119,7 @@ bool qemu_aio_wait(void)
         return true;
     }
 
-    walking_handlers = 1;
+    walking_handlers++;
 
     FD_ZERO(&rdfds);
     FD_ZERO(&wrfds);
@@ -147,7 +147,7 @@ bool qemu_aio_wait(void)
         }
     }
 
-    walking_handlers = 0;
+    walking_handlers--;
 
     /* No AIO operations?  Get us out of here */
     if (!busy) {
@@ -159,14 +159,14 @@ bool qemu_aio_wait(void)
 
     /* if we have any readable fds, dispatch event */
     if (ret > 0) {
-        walking_handlers = 1;
-
         /* we have to walk very carefully in case
          * qemu_aio_set_fd_handler is called while we're walking */
         node = QLIST_FIRST(&aio_handlers);
         while (node) {
             AioHandler *tmp;
 
+            walking_handlers++;
+
             if (!node->deleted &&
                 FD_ISSET(node->fd, &rdfds) &&
                 node->io_read) {
@@ -181,13 +181,13 @@ bool qemu_aio_wait(void)
             tmp = node;
             node = QLIST_NEXT(node, node);
 
-            if (tmp->deleted) {
+            walking_handlers--;
+
+            if (!walking_handlers && tmp->deleted) {
                 QLIST_REMOVE(tmp, node);
                 g_free(tmp);
             }
         }
-
-        walking_handlers = 0;
     }
 
     return true;