[PATCH v1 5/5] video-stream: Don't stop a stream if a gl_draw operation is pending

[Vivek Kasireddy <vivek.kasireddy@xxxxxxxxx>]

Before stopping a stream, we need to ensure that there is no ongoing
gl_draw operation; otherwise, we may not get another opportunity to
create a new stream if the current one gets stopped. And, once the
stream is stopped, we need to clear the gl_draw_stream pointer
associated with the relevant client (dcc).

Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Cc: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
Cc: Dongwon Kim <dongwon.kim@xxxxxxxxx>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@xxxxxxxxx>
---
 server/video-stream.cpp | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/server/video-stream.cpp b/server/video-stream.cpp
index 03a7d68d..b7f3d2c5 100644
--- a/server/video-stream.cpp
+++ b/server/video-stream.cpp
@@ -18,6 +18,7 @@
 
 #include "video-stream.h"
 #include "display-channel-private.h"
+#include "dcc-private.h"
 #include "main-channel-client.h"
 #include "red-client.h"
 
@@ -115,6 +116,10 @@ void video_stream_stop(DisplayChannel *display, VideoStream *stream)
         }
         dcc->pipe_add(video_stream_destroy_item_new(stream_agent));
         video_stream_agent_stats_print(stream_agent);
+
+        if (stream == dcc->priv->gl_draw_stream) {
+            dcc->priv->gl_draw_stream = nullptr;
+        }
     }
     display->priv->streams_size_total -= stream->width * stream->height;
     ring_remove(&stream->link);
@@ -974,6 +979,19 @@ void video_stream_detach_and_stop(DisplayChannel *display)
     }
 }
 
+static bool is_stream_gl_draw(VideoStream *stream, DisplayChannel *display)
+{
+    DisplayChannelClient *dcc;
+
+    FOREACH_DCC(display, dcc) {
+        if (stream == dcc->priv->gl_draw_stream &&
+            dcc->priv->gl_draw_ongoing) {
+            return TRUE;
+        }
+    }
+    return FALSE;
+}
+
 void video_stream_timeout(DisplayChannel *display)
 {
     Ring *ring = &display->priv->streams;
@@ -984,7 +1002,8 @@ void video_stream_timeout(DisplayChannel *display)
     while (item) {
         VideoStream *stream = SPICE_CONTAINEROF(item, VideoStream, link);
         item = ring_next(ring, item);
-        if (now >= (stream->last_time + RED_STREAM_TIMEOUT)) {
+        if (now >= (stream->last_time + RED_STREAM_TIMEOUT) &&
+            !is_stream_gl_draw(stream, display)) {
             detach_video_stream_gracefully(display, stream, nullptr);
             video_stream_stop(display, stream);
         }
-- 
2.37.2