[Mesa-stable] [PATCH v2] egl/dri2: dri2_make_current: Release previous context's display

[Nicolas Boichat]

eglMakeCurrent can also be used to change the active display. In that
case, we need to decrement ref_count of the previous display (possibly
destroying it), and increment it on the next display.

Also, old_dsurf/old_rsurf cannot be non-NULL if old_ctx is NULL, so
we only need to test if old_ctx is non-NULL.

v2: Save the old display before destroying the context.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97214
Fixes: 9ee683f877 (egl/dri2: Add reference count for dri2_egl_display)
Cc: "12.0" <mesa-stable at lists.freedesktop.org>
Reported-by: Alexandr Zelinsky <mexahotabop at w1l.ru>
Tested-by: Alexandr Zelinsky <mexahotabop at w1l.ru>
Signed-off-by: Nicolas Boichat <drinkcat at chromium.org>
---

Alexandr: Can you give this one another try? Thanks!

 src/egl/drivers/dri2/egl_dri2.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 1ad6855..dde9804 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -1269,13 +1269,14 @@ dri2_make_current(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *dsurf,
          drv->API.DestroySurface(drv, disp, old_dsurf);
       if (old_rsurf)
          drv->API.DestroySurface(drv, disp, old_rsurf);
-      if (old_ctx)
-         drv->API.DestroyContext(drv, disp, old_ctx);
 
       if (!unbind)
          dri2_dpy->ref_count++;
-      if (old_dsurf || old_rsurf || old_ctx)
-         dri2_display_release(disp);
+      if (old_ctx) {
+         EGLDisplay old_disp = _eglGetDisplayHandle(old_ctx->Resource.Display);
+         drv->API.DestroyContext(drv, disp, old_ctx);
+         dri2_display_release(old_disp);
+      }
 
       return EGL_TRUE;
    } else {
-- 
2.8.0.rc3.226.g39d4020