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block: Allow bdrv_unref_child(bs, NULL) 

bdrv_unref() can be called with a NULL argument and doesn't do anything
then. Make bdrv_unref_child() consistent with it.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
Kevin Wolf 2015-10-13 14:09:44 +02:00
parent 8e419aefa0
commit 779020cbdc
1 changed files with 6 additions and 1 deletions
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7
block.c
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@ -1104,12 +1104,17 @@ static void bdrv_detach_child(BdrvChild *child)
void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child)
{
BlockDriverState *child_bs = child->bs;
BlockDriverState *child_bs;
if (child == NULL) {
return;
}
if (child->bs->inherits_from == parent) {
child->bs->inherits_from = NULL;
}
child_bs = child->bs;
bdrv_detach_child(child);
bdrv_unref(child_bs);
}