chardev: Drop useless ChardevDummy type

Commit d0d7708b made ChardevDummy be an empty wrapper type around
ChardevCommon.  But there is no technical reason for this indirection,
so simplify the code by directly using the base type.

Also change the fallback assignment to assign u.null rather than
u.data, since a future patch will remove the data member of the C
struct generated for QAPI unions.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <1457106160-23614-1-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

diff --git a/backends/baum.c b/backends/baum.c
index 374562a4830d621303046f5d7563ec54e3ea2748..c11320eecfa247936511f0a231b8995a352befc4 100644 (file)
--- a/backends/baum.c
+++ b/backends/baum.c
@@ -567,7 +567,7 @@ static CharDriverState *chr_baum_init(const char *id,
                                       ChardevReturn *ret,
                                       Error **errp)
 {
-    ChardevCommon *common = qapi_ChardevDummy_base(backend->u.braille);
+    ChardevCommon *common = backend->u.braille;
     BaumDriverState *baum;
     CharDriverState *chr;
     brlapi_handle_t *handle;

diff --git a/backends/msmouse.c b/backends/msmouse.c
index 9a82efda9e784542718bb8be88851277092c1076..5e1833c6e66f98e1bd0da9dfaed4ffa5e8d1887b 100644 (file)
--- a/backends/msmouse.c
+++ b/backends/msmouse.c
@@ -68,7 +68,7 @@ static CharDriverState *qemu_chr_open_msmouse(const char *id,
                                               ChardevReturn *ret,
                                               Error **errp)
 {
-    ChardevCommon *common = qapi_ChardevDummy_base(backend->u.msmouse);
+    ChardevCommon *common = backend->u.msmouse;
     CharDriverState *chr;
 
     chr = qemu_chr_alloc(common, errp);

diff --git a/qapi-schema.json b/qapi-schema.json
index 42fd61b2cefa200a16f227301ac4fce15ed90548..362c9d816a28b7f6f0e92bafb5c2fca91f841aa1 100644 (file)
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -3323,23 +3323,20 @@
 #
 # Since: 1.4 (testdev since 2.2)
 ##
-{ 'struct': 'ChardevDummy', 'data': { },
-  'base': 'ChardevCommon' }
-
 { 'union': 'ChardevBackend', 'data': { 'file'   : 'ChardevFile',
                                        'serial' : 'ChardevHostdev',
                                        'parallel': 'ChardevHostdev',
                                        'pipe'   : 'ChardevHostdev',
                                        'socket' : 'ChardevSocket',
                                        'udp'    : 'ChardevUdp',
-                                       'pty'    : 'ChardevDummy',
-                                       'null'   : 'ChardevDummy',
+                                       'pty'    : 'ChardevCommon',
+                                       'null'   : 'ChardevCommon',
                                        'mux'    : 'ChardevMux',
-                                       'msmouse': 'ChardevDummy',
-                                       'braille': 'ChardevDummy',
-                                       'testdev': 'ChardevDummy',
+                                       'msmouse': 'ChardevCommon',
+                                       'braille': 'ChardevCommon',
+                                       'testdev': 'ChardevCommon',
                                        'stdio'  : 'ChardevStdio',
-                                       'console': 'ChardevDummy',
+                                       'console': 'ChardevCommon',
                                        'spicevmc' : 'ChardevSpiceChannel',
                                        'spiceport' : 'ChardevSpicePort',
                                        'vc'     : 'ChardevVC',

diff --git a/qemu-char.c b/qemu-char.c
index af311023d693ef5c0133a834809d57f1558548c9..e0147f3e8bd1cbd4eac6da35e56051caf79c1c3a 100644 (file)
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -420,7 +420,7 @@ static CharDriverState *qemu_chr_open_null(const char *id,
                                            Error **errp)
 {
     CharDriverState *chr;
-    ChardevCommon *common = qapi_ChardevDummy_base(backend->u.null);
+    ChardevCommon *common = backend->u.null;
 
     chr = qemu_chr_alloc(common, errp);
     if (!chr) {
@@ -1366,7 +1366,7 @@ static CharDriverState *qemu_chr_open_pty(const char *id,
     PtyCharDriver *s;
     int master_fd, slave_fd;
     char pty_name[PATH_MAX];
-    ChardevCommon *common = qapi_ChardevDummy_base(backend->u.pty);
+    ChardevCommon *common = backend->u.pty;
 
     master_fd = qemu_openpty_raw(&slave_fd, pty_name);
     if (master_fd < 0) {
@@ -2183,7 +2183,7 @@ static CharDriverState *qemu_chr_open_win_con(const char *id,
                                               ChardevReturn *ret,
                                               Error **errp)
 {
-    ChardevCommon *common = qapi_ChardevDummy_base(backend->u.console);
+    ChardevCommon *common = backend->u.console;
     return qemu_chr_open_win_file(GetStdHandle(STD_OUTPUT_HANDLE),
                                   common, errp);
 }
@@ -3817,7 +3817,7 @@ CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
     } else {
         ChardevCommon *cc = g_new0(ChardevCommon, 1);
         qemu_chr_parse_common(opts, cc);
-        backend->u.data = cc;
+        backend->u.null = cc; /* Any ChardevCommon member would work */
     }
 
     ret = qmp_chardev_add(bid ? bid : id, backend, errp);