haraldwolff/qemu-patch-raspberry4
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block: Reorder cleanups in bdrv_close()

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Block drivers may still want to access their child nodes in their
.bdrv_close handler. If they unref and/or detach a child by themselves,
this should not result in a double free.

There is additional code for backing files, which are just a special
case of child nodes. The same applies for them.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2015-06-16 10:58:20 +02:00
parent 33a604075c
commit 9a7dedbc43
1 changed files with 8 additions and 6 deletions
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14
block.c
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@ -1901,6 +1901,14 @@ void bdrv_close(BlockDriverState *bs)
if (bs->drv) {
BdrvChild *child, *next;
bs->drv->bdrv_close(bs);
if (bs->backing_hd) {
BlockDriverState *backing_hd = bs->backing_hd;
bdrv_set_backing_hd(bs, NULL);
bdrv_unref(backing_hd);
}
QLIST_FOREACH_SAFE(child, &bs->children, next, next) {
/* TODO Remove bdrv_unref() from drivers' close function and use
* bdrv_unref_child() here */
@ -1910,12 +1918,6 @@ void bdrv_close(BlockDriverState *bs)
bdrv_detach_child(child);
}
if (bs->backing_hd) {
BlockDriverState *backing_hd = bs->backing_hd;
bdrv_set_backing_hd(bs, NULL);
bdrv_unref(backing_hd);
}
bs->drv->bdrv_close(bs);
g_free(bs->opaque);
bs->opaque = NULL;
bs->drv = NULL;