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block: allow bdrv_unref() to be passed NULL pointers 

If bdrv_unref() is passed a NULL BDS pointer, it is safe to
exit with no operation.  This will allow cleanup code to blindly
call bdrv_unref() on a BDS that has been initialized to NULL.

Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Jeff Cody 2014-07-23 17:22:57 -04:00 committed by Kevin Wolf
parent 58803ce74f
commit 9a4d5ca607
1 changed files with 3 additions and 0 deletions
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3
block.c
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@ -5381,6 +5381,9 @@ void bdrv_ref(BlockDriverState *bs)
* deleted. */ * deleted. */
void bdrv_unref(BlockDriverState *bs) void bdrv_unref(BlockDriverState *bs)
{ {
if (!bs) {
return;
}
assert(bs->refcnt > 0); assert(bs->refcnt > 0);
if (--bs->refcnt == 0) { if (--bs->refcnt == 0) {
bdrv_delete(bs); bdrv_delete(bs);