[RFC PATCH 12/12] qapi/qom: Add class definition for rng-egd

[Kevin Wolf <kwolf@redhat.com>]

Switch object creation to .instance_config and remove the property
setter that would only return an error after creation anyway.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qapi/qom.json      | 12 ++++++------
 backends/rng-egd.c | 18 +++++++-----------
 2 files changed, 13 insertions(+), 17 deletions(-)

diff --git a/qapi/qom.json b/qapi/qom.json
index 864c6a658b..fce24428f8 100644
--- a/qapi/qom.json
+++ b/qapi/qom.json
@@ -742,18 +742,18 @@
   'parent': 'rng-backend' }
 
 ##
-# @RngEgdProperties:
+# @rng-egd:
 #
-# Properties for rng-egd objects.
+# Random number generator backend connecting to an EGD-compatible daemon
 #
 # @chardev: the name of a character device backend that provides the connection
 #           to the RNG daemon
 #
 # Since: 1.3
 ##
-{ 'struct': 'RngEgdProperties',
-  'base': 'RngProperties',
-  'data': { 'chardev': 'str' } }
+{ 'class': 'rng-egd',
+  'parent': 'rng-backend',
+  'config': { 'chardev': 'str' } }
 
 ##
 # @rng-random:
@@ -908,7 +908,7 @@
                                       'if': 'CONFIG_LINUX' },
       'qtest':                      'QtestProperties',
       'rng-builtin':                'qom-config:rng-builtin',
-      'rng-egd':                    'RngEgdProperties',
+      'rng-egd':                    'qom-config:rng-egd',
       'rng-random':                 { 'type': 'qom-config:rng-random',
                                       'if': 'CONFIG_POSIX' },
       'secret':                     'SecretProperties',
diff --git a/backends/rng-egd.c b/backends/rng-egd.c
index 4de142b9dc..89255dc6fa 100644
--- a/backends/rng-egd.c
+++ b/backends/rng-egd.c
@@ -15,6 +15,7 @@
 #include "chardev/char-fe.h"
 #include "qapi/error.h"
 #include "qapi/qmp/qerror.h"
+#include "qapi/qapi-qom-qom.h"
 #include "qemu/module.h"
 #include "qom/object.h"
 
@@ -110,17 +111,12 @@ static void rng_egd_opened(RngBackend *b, Error **errp)
                              rng_egd_chr_read, NULL, NULL, s, NULL, true);
 }
 
-static void rng_egd_set_chardev(Object *obj, const char *value, Error **errp)
+bool qom_rng_egd_config(Object *obj, const char *chardev, Error **errp)
 {
-    RngBackend *b = RNG_BACKEND(obj);
-    RngEgd *s = RNG_EGD(b);
+    RngEgd *s = RNG_EGD(obj);
 
-    if (b->opened) {
-        error_setg(errp, QERR_PERMISSION_DENIED);
-    } else {
-        g_free(s->chr_name);
-        s->chr_name = g_strdup(value);
-    }
+    s->chr_name = g_strdup(chardev);
+    return true;
 }
 
 static char *rng_egd_get_chardev(Object *obj, Error **errp)
@@ -149,8 +145,7 @@ static void rng_egd_class_init(ObjectClass *klass, void *data)
 
     rbc->request_entropy = rng_egd_request_entropy;
     rbc->opened = rng_egd_opened;
-    object_class_property_add_str(klass, "chardev",
-                                  rng_egd_get_chardev, rng_egd_set_chardev);
+    object_class_property_add_str(klass, "chardev", rng_egd_get_chardev, NULL);
 }
 
 static const TypeInfo rng_egd_info = {
@@ -158,6 +153,7 @@ static const TypeInfo rng_egd_info = {
     .parent = TYPE_RNG_BACKEND,
     .instance_size = sizeof(RngEgd),
     .class_init = rng_egd_class_init,
+    .instance_config = qom_rng_egd_marshal_config,
     .instance_finalize = rng_egd_finalize,
 };
 
-- 
2.31.1