qapi: Use returned bool to check for failure, manual part

The previous commit used Coccinelle to convert from checking the Error
object to checking the return value.  Convert a few more manually.
Also tweak control flow in places to conform to the conventional "if
error bail out" pattern.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200707160613.848843-20-armbru@redhat.com>

accel/kvm/kvm-all.c

@@ -3128,37 +3128,33 @@ static void kvm_set_kernel_irqchip(Object *obj, Visitor *v,
                                    const char *name, void *opaque,
                                    Error **errp)
 {
-    Error *err = NULL;
     KVMState *s = KVM_STATE(obj);
     OnOffSplit mode;
 
-    visit_type_OnOffSplit(v, name, &mode, &err);
-    if (err) {
-        error_propagate(errp, err);
+    if (!visit_type_OnOffSplit(v, name, &mode, errp)) {
         return;
-    } else {
-        switch (mode) {
-        case ON_OFF_SPLIT_ON:
-            s->kernel_irqchip_allowed = true;
-            s->kernel_irqchip_required = true;
-            s->kernel_irqchip_split = ON_OFF_AUTO_OFF;
-            break;
-        case ON_OFF_SPLIT_OFF:
-            s->kernel_irqchip_allowed = false;
-            s->kernel_irqchip_required = false;
-            s->kernel_irqchip_split = ON_OFF_AUTO_OFF;
-            break;
-        case ON_OFF_SPLIT_SPLIT:
-            s->kernel_irqchip_allowed = true;
-            s->kernel_irqchip_required = true;
-            s->kernel_irqchip_split = ON_OFF_AUTO_ON;
-            break;
-        default:
-            /* The value was checked in visit_type_OnOffSplit() above. If
-             * we get here, then something is wrong in QEMU.
-             */
-            abort();
-        }
+    }
+    switch (mode) {
+    case ON_OFF_SPLIT_ON:
+        s->kernel_irqchip_allowed = true;
+        s->kernel_irqchip_required = true;
+        s->kernel_irqchip_split = ON_OFF_AUTO_OFF;
+        break;
+    case ON_OFF_SPLIT_OFF:
+        s->kernel_irqchip_allowed = false;
+        s->kernel_irqchip_required = false;
+        s->kernel_irqchip_split = ON_OFF_AUTO_OFF;
+        break;
+    case ON_OFF_SPLIT_SPLIT:
+        s->kernel_irqchip_allowed = true;
+        s->kernel_irqchip_required = true;
+        s->kernel_irqchip_split = ON_OFF_AUTO_ON;
+        break;
+    default:
+        /* The value was checked in visit_type_OnOffSplit() above. If
+         * we get here, then something is wrong in QEMU.
+         */
+        abort();
     }
 }
 

block/throttle-groups.c

@@ -895,8 +895,8 @@ static void throttle_group_set_limits(Object *obj, Visitor *v,
     ThrottleLimits *argp;
     Error *local_err = NULL;
 
-    if (!visit_type_ThrottleLimits(v, name, &argp, &local_err)) {
-        goto ret;
+    if (!visit_type_ThrottleLimits(v, name, &argp, errp)) {
+        return;
     }
     qemu_mutex_lock(&tg->lock);
     throttle_get_config(&tg->ts, &cfg);
@@ -908,7 +908,6 @@ static void throttle_group_set_limits(Object *obj, Visitor *v,
 
 unlock:
     qemu_mutex_unlock(&tg->lock);
-ret:
     qapi_free_ThrottleLimits(argp);
     error_propagate(errp, local_err);
     return;

bootdevice.c

@@ -297,8 +297,8 @@ static void device_set_bootindex(Object *obj, Visitor *v, const char *name,
     int32_t boot_index;
     Error *local_err = NULL;
 
-    if (!visit_type_int32(v, name, &boot_index, &local_err)) {
-        goto out;
+    if (!visit_type_int32(v, name, &boot_index, errp)) {
+        return;
     }
     /* check whether bootindex is present in fw_boot_order list  */
     check_boot_index(boot_index, &local_err);

hw/core/qdev-properties.c

@@ -761,15 +761,15 @@ static void set_pci_devfn(Object *obj, Visitor *v, const char *name,
     if (!visit_type_str(v, name, &str, &local_err)) {
         error_free(local_err);
         local_err = NULL;
-        visit_type_int32(v, name, &value, &local_err);
-        if (local_err) {
-            error_propagate(errp, local_err);
-        } else if (value < -1 || value > 255) {
+        if (!visit_type_int32(v, name, &value, errp)) {
+            return;
+        }
+        if (value < -1 || value > 255) {
             error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
                        name ? name : "null", "pci_devfn");
-        } else {
-            *ptr = value;
+            return;
         }
+        *ptr = value;
         return;
     }
 

hw/ide/qdev.c

@@ -245,8 +245,8 @@ static void ide_dev_set_bootindex(Object *obj, Visitor *v, const char *name,
     int32_t boot_index;
     Error *local_err = NULL;
 
-    if (!visit_type_int32(v, name, &boot_index, &local_err)) {
-        goto out;
+    if (!visit_type_int32(v, name, &boot_index, errp)) {
+        return;
     }
     /* check whether bootindex is present in fw_boot_order list  */
     check_boot_index(boot_index, &local_err);

hw/mem/nvdimm.c

@@ -85,21 +85,18 @@ static void nvdimm_set_uuid(Object *obj, Visitor *v, const char *name,
                                   void *opaque, Error **errp)
 {
     NVDIMMDevice *nvdimm = NVDIMM(obj);
-    Error *local_err = NULL;
     char *value;
 
-    if (!visit_type_str(v, name, &value, &local_err)) {
-        goto out;
+    if (!visit_type_str(v, name, &value, errp)) {
+        return;
     }
 
     if (qemu_uuid_parse(value, &nvdimm->uuid) != 0) {
         error_setg(errp, "Property '%s.%s' has invalid value",
                    object_get_typename(obj), name);
     }
-    g_free(value);
 
-out:
-    error_propagate(errp, local_err);
+    g_free(value);
 }
 
 

hw/net/ne2000-isa.c

@@ -113,8 +113,8 @@ static void isa_ne2000_set_bootindex(Object *obj, Visitor *v,
     int32_t boot_index;
     Error *local_err = NULL;
 
-    if (!visit_type_int32(v, name, &boot_index, &local_err)) {
-        goto out;
+    if (!visit_type_int32(v, name, &boot_index, errp)) {
+        return;
     }
     /* check whether bootindex is present in fw_boot_order list  */
     check_boot_index(boot_index, &local_err);

hw/usb/dev-storage.c

@@ -736,8 +736,8 @@ static void usb_msd_set_bootindex(Object *obj, Visitor *v, const char *name,
     int32_t boot_index;
     Error *local_err = NULL;
 
-    if (!visit_type_int32(v, name, &boot_index, &local_err)) {
-        goto out;
+    if (!visit_type_int32(v, name, &boot_index, errp)) {
+        return;
     }
     /* check whether bootindex is present in fw_boot_order list  */
     check_boot_index(boot_index, &local_err);

net/net.c

@@ -1062,7 +1062,6 @@ static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
 {
     gchar **substrings = NULL;
     Netdev *object = NULL;
-    Error *err = NULL;
     int ret = -1;
     Visitor *v = opts_visitor_new(opts);
 
@@ -1110,16 +1109,13 @@ static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
         qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++));
     }
 
-    visit_type_Netdev(v, NULL, &object, &err);
-
-    if (!err) {
-        ret = net_client_init1(object, is_netdev, &err);
+    if (visit_type_Netdev(v, NULL, &object, errp)) {
+        ret = net_client_init1(object, is_netdev, errp);
     }
 
     qapi_free_Netdev(object);
 
 out:
-    error_propagate(errp, err);
     g_strfreev(substrings);
     visit_free(v);
     return ret;