[Qemu-devel] [PATCH] memory: move MemoryRegion::size cleanup to memory_region_finalize()

[Igor Mammedov <imammedo@redhat.com>]

It's not necessary to clean up MemoryRegion::size manually in multiple places
like it's been implemented in
 (1cd3d49262 "memory: cleanup side effects of  memory_region_init_foo() on failure")
since each memory_region_init_foo() now calls object_unparent(mr) on failure,
memory region destructor memory_region_finalize() will be called upon its
completion for each memory_region_init_foo().
It's sufficient to clean MemoryRegion::size only from memory_region_finalize(),
so do it.

Suggested-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
smoke tested with reproducer from 1cd3d49262, thing still works as expected
---
 memory.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/memory.c b/memory.c
index d852f11..ad24b57 100644
--- a/memory.c
+++ b/memory.c
@@ -1491,7 +1491,6 @@ void memory_region_init_ram_shared_nomigrate(MemoryRegion *mr,
     mr->ram_block = qemu_ram_alloc(size, share, mr, &err);
     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
     if (err) {
-        mr->size = int128_zero();
         object_unparent(OBJECT(mr));
         error_propagate(errp, err);
     }
@@ -1516,7 +1515,6 @@ void memory_region_init_resizeable_ram(MemoryRegion *mr,
                                               mr, &err);
     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
     if (err) {
-        mr->size = int128_zero();
         object_unparent(OBJECT(mr));
         error_propagate(errp, err);
     }
@@ -1541,7 +1539,6 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
     mr->ram_block = qemu_ram_alloc_from_file(size, mr, ram_flags, path, &err);
     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
     if (err) {
-        mr->size = int128_zero();
         object_unparent(OBJECT(mr));
         error_propagate(errp, err);
     }
@@ -1565,7 +1562,6 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr,
                                            fd, &err);
     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
     if (err) {
-        mr->size = int128_zero();
         object_unparent(OBJECT(mr));
         error_propagate(errp, err);
     }
@@ -1628,7 +1624,6 @@ void memory_region_init_rom_nomigrate(MemoryRegion *mr,
     mr->ram_block = qemu_ram_alloc(size, false, mr, &err);
     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
     if (err) {
-        mr->size = int128_zero();
         object_unparent(OBJECT(mr));
         error_propagate(errp, err);
     }
@@ -1652,7 +1647,6 @@ void memory_region_init_rom_device_nomigrate(MemoryRegion *mr,
     mr->destructor = memory_region_destructor_ram;
     mr->ram_block = qemu_ram_alloc(size, false,  mr, &err);
     if (err) {
-        mr->size = int128_zero();
         object_unparent(OBJECT(mr));
         error_propagate(errp, err);
     }
@@ -1701,6 +1695,7 @@ static void memory_region_finalize(Object *obj)
     memory_region_clear_coalescing(mr);
     g_free((char *)mr->name);
     g_free(mr->ioeventfds);
+    mr->size = int128_zero();
 }
 
 Object *memory_region_owner(MemoryRegion *mr)
-- 
2.7.4