[Qemu-devel] [PATCH] console: ignore ui_info updates which don't actually update something

From: Gerd Hoffmann <kraxel@redhat.com>
To: qemu-devel@nongnu.org
Cc: Gerd Hoffmann <kraxel@redhat.com>
Subject: [Qemu-devel] [PATCH] console: ignore ui_info updates which don't actually update something
Date: Mon, 30 May 2016 10:41:13 +0200	[thread overview]
Message-ID: <1464597673-26464-1-git-send-email-kraxel@redhat.com> (raw)

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 ui/console.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/ui/console.c b/ui/console.c
index 6402010..581480f 100644
--- a/ui/console.c
+++ b/ui/console.c
@@ -1457,16 +1457,21 @@ bool dpy_ui_info_supported(QemuConsole *con)
 int dpy_set_ui_info(QemuConsole *con, QemuUIInfo *info)
 {
     assert(con != NULL);
-    con->ui_info = *info;
+
     if (!dpy_ui_info_supported(con)) {
         return -1;
     }
+    if (memcmp(&con->ui_info, info, sizeof(con->ui_info)) == 0) {
+        /* nothing changed -- ignore */
+        return 0;
+    }
 
     /*
      * Typically we get a flood of these as the user resizes the window.
      * Wait until the dust has settled (one second without updates), then
      * go notify the guest.
      */
+    con->ui_info = *info;
     timer_mod(con->ui_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 1000);
     return 0;
 }
-- 
1.8.3.1
