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block: Clean up a misuse of qobject_to() in .bdrv_co_create_opts()

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The following pattern occurs in the .bdrv_co_create_opts() methods of
parallels, qcow, qcow2, qed, vhdx and vpc:

    qobj = qdict_crumple_for_keyval_qiv(qdict, errp);
    qobject_unref(qdict);
    qdict = qobject_to(QDict, qobj);
    if (qdict == NULL) {
         ret = -EINVAL;
         goto done;
    }

    v = qobject_input_visitor_new_keyval(QOBJECT(qdict));
    [...]
    ret = 0;
done:
    qobject_unref(qdict);
    [...]
    return ret;

If qobject_to() fails, we return failure without setting errp.  That's
wrong.  As far as I can tell, it cannot fail here.  Clean it up
anyway, by removing the useless conversion.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Markus Armbruster 2018-06-14 21:14:32 +02:00 • committed by Kevin Wolf
parent 374c52467a
commit 92adf9dbcd
6 changed files with 24 additions and 30 deletions
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9
block/vpc.c
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@ -1081,7 +1081,7 @@ static int coroutine_fn vpc_co_create_opts(const char *filename,
QemuOpts *opts, Error **errp)
{
BlockdevCreateOptions *create_options = NULL;
QDict *qdict = NULL;
QDict *qdict;
QObject *qobj;
Visitor *v;
BlockDriverState *bs = NULL;
@ -1120,14 +1120,13 @@ static int coroutine_fn vpc_co_create_opts(const char *filename,
qdict_put_str(qdict, "file", bs->node_name);
qobj = qdict_crumple_for_keyval_qiv(qdict, errp);
qobject_unref(qdict);
qdict = qobject_to(QDict, qobj);
if (qdict == NULL) {
if (!qobj) {
ret = -EINVAL;
goto fail;
}
v = qobject_input_visitor_new_keyval(QOBJECT(qdict));
v = qobject_input_visitor_new_keyval(qobj);
qobject_unref(qobj);
visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err);
visit_free(v);