From 9cc36895f5a773ac65abedd6b56748c8e15d2eaf Mon Sep 17 00:00:00 2001

From: Markus Armbruster <armbru@redhat.com>

Date: Mon, 18 Jun 2018 08:43:19 +0200

Subject: [PATCH 021/268] block: Clean up a misuse of qobject_to() in

 .bdrv_co_create_opts()

RH-Author: Markus Armbruster <armbru@redhat.com>

Message-id: <20180618084330.30009-13-armbru@redhat.com>

Patchwork-id: 80733

O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 12/23] block: Clean up a misuse of qobject_to() in .bdrv_co_create_opts()

Bugzilla: 1557995

RH-Acked-by: Max Reitz <mreitz@redhat.com>

RH-Acked-by: Jeffrey Cody <jcody@redhat.com>

RH-Acked-by: Kevin Wolf <kwolf@redhat.com>

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>

(cherry picked from commit 92adf9dbcd3cf9cedddae995b04a99f5c42ae08c)

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

---

 block/parallels.c | 9 ++++-----

 block/qcow.c      | 9 ++++-----

 block/qcow2.c     | 9 ++++-----

 block/qed.c       | 9 ++++-----

 block/vhdx.c      | 9 ++++-----

 block/vpc.c       | 9 ++++-----

 6 files changed, 24 insertions(+), 30 deletions(-)

diff --git a/block/parallels.c b/block/parallels.c

index aa58955..1c96c39 100644

--- a/block/parallels.c

+++ b/block/parallels.c

@@ -614,7 +614,7 @@ static int coroutine_fn parallels_co_create_opts(const char *filename,

     BlockdevCreateOptions *create_options = NULL;

     Error *local_err = NULL;

     BlockDriverState *bs = NULL;

-    QDict *qdict = NULL;

+    QDict *qdict;

     QObject *qobj;

     Visitor *v;

     int ret;

@@ -652,14 +652,13 @@ static int coroutine_fn parallels_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 done;

     }

-    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);

diff --git a/block/qcow.c b/block/qcow.c

index 14b7296..43a595a 100644

--- a/block/qcow.c

+++ b/block/qcow.c

@@ -944,7 +944,7 @@ static int coroutine_fn qcow_co_create_opts(const char *filename,

 {

     BlockdevCreateOptions *create_options = NULL;

     BlockDriverState *bs = NULL;

-    QDict *qdict = NULL;

+    QDict *qdict;

     QObject *qobj;

     Visitor *v;

     const char *val;

@@ -996,14 +996,13 @@ static int coroutine_fn qcow_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);

diff --git a/block/qcow2.c b/block/qcow2.c

index fa06b41..ede52a8 100644

--- a/block/qcow2.c

+++ b/block/qcow2.c

@@ -3067,7 +3067,7 @@ static int coroutine_fn qcow2_co_create_opts(const char *filename, QemuOpts *opt

                                              Error **errp)

 {

     BlockdevCreateOptions *create_options = NULL;

-    QDict *qdict = NULL;

+    QDict *qdict;

     QObject *qobj;

     Visitor *v;

     BlockDriverState *bs = NULL;

@@ -3140,14 +3140,13 @@ static int coroutine_fn qcow2_co_create_opts(const char *filename, QemuOpts *opt

     /* Now get the QAPI type BlockdevCreateOptions */

     qobj = qdict_crumple_for_keyval_qiv(qdict, errp);

-    qobject_unref(qdict);

-    qdict = qobject_to(QDict, qobj);

-    if (qdict == NULL) {

+    if (!qobj) {

         ret = -EINVAL;

         goto finish;

     }

-    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);

diff --git a/block/qed.c b/block/qed.c

index d8810f5..3818888 100644

--- a/block/qed.c

+++ b/block/qed.c

@@ -722,7 +722,7 @@ static int coroutine_fn bdrv_qed_co_create_opts(const char *filename,

                                                 Error **errp)

 {

     BlockdevCreateOptions *create_options = NULL;

-    QDict *qdict = NULL;

+    QDict *qdict;

     QObject *qobj;

     Visitor *v;

     BlockDriverState *bs = NULL;

@@ -764,14 +764,13 @@ static int coroutine_fn bdrv_qed_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);

diff --git a/block/vhdx.c b/block/vhdx.c

index 32939c4..728d8b3 100644

--- a/block/vhdx.c

+++ b/block/vhdx.c

@@ -1963,7 +1963,7 @@ static int coroutine_fn vhdx_co_create_opts(const char *filename,

                                             Error **errp)

 {

     BlockdevCreateOptions *create_options = NULL;

-    QDict *qdict = NULL;

+    QDict *qdict;

     QObject *qobj;

     Visitor *v;

     BlockDriverState *bs = NULL;

@@ -2004,14 +2004,13 @@ static int coroutine_fn vhdx_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);

diff --git a/block/vpc.c b/block/vpc.c

index 16178e5..a9bb041 100644

--- a/block/vpc.c

+++ b/block/vpc.c

@@ -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);

-- 

1.8.3.1