char: use a const CharDriver

No need to allocate & copy fields, let's use static const struct instead.

Add an alias field to the CharDriver structure to cover the cases where
we previously registered a driver twice under two names.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/backends/baum.c b/backends/baum.c
index b045ef49c5..2e404a11cc 100644
--- a/backends/baum.c
+++ b/backends/baum.c
@@ -671,8 +671,12 @@ fail_handle:
 
 static void register_types(void)
 {
-    register_char_driver("braille", CHARDEV_BACKEND_KIND_BRAILLE, NULL,
-                         chr_baum_init);
+    static const CharDriver driver = {
+        .kind = CHARDEV_BACKEND_KIND_BRAILLE,
+        .create = chr_baum_init,
+    };
+
+    register_char_driver(&driver);
 }
 
 type_init(register_types);