hw/xen: do not repeatedly try to create a failing backend device

[qmiga/qemu.git] / block.c

diff --git a/block.c b/block.c
index fd348f5..a527aa1 100644 (file)
--- a/block.c
+++ b/block.c
@@ -320,8 +320,6 @@ int bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg,
     int ret = 0;
     IO_CODE();
 
-    assume_graph_lock(); /* FIXME */
-
     if (!(bs->open_flags & BDRV_O_RDWR)) {
         return 0;
     }
@@ -1908,7 +1906,9 @@ static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file,
 
     if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, ro)) {
         if (!ro && bdrv_is_whitelisted(drv, true)) {
+            bdrv_graph_rdlock_main_loop();
             ret = bdrv_apply_auto_read_only(bs, NULL, NULL);
+            bdrv_graph_rdunlock_main_loop();
         } else {
             ret = -ENOTSUP;
         }
@@ -2973,6 +2973,8 @@ static void bdrv_child_free(BdrvChild *child)
 {
     assert(!child->bs);
     GLOBAL_STATE_CODE();
+    GRAPH_RDLOCK_GUARD_MAINLOOP();
+
     assert(!child->next.le_prev); /* not in children list */
 
     g_free(child->name);
@@ -5198,7 +5200,7 @@ static void bdrv_close(BlockDriverState *bs)
         bs->drv = NULL;
     }
 
-    bdrv_graph_wrlock(NULL);
+    bdrv_graph_wrlock(bs);
     QLIST_FOREACH_SAFE(child, &bs->children, next, next) {
         bdrv_unref_child(bs, child);
     }