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egl/dri2: only take a dri2_dpy reference when binding a new context/surfaces 

This effectively reverts part of 2907faee, which changed dri2_make_current() to
always take a dri2_dpy reference regardless of whether or not a new context or
surface(s) were being bound. This led to a reference count imbalance as there
was no corresponding code added to drop a reference on the dri2_dpy. As a
consequence, any application that called eglInitialize() on a default/native
display after having called eglTerminate() would always get back the old
dri2_dpy, inheriting its previous state.

As the reference count is there to prevent the dri2_dpy from being destroyed
between eglTerminate() and eglInitialize() calls when a context is still bound,
a reference should only be taken when a successful call to
dri2_dpy->core->bindContext() has been made. Fix the issue by restoring the old
reference counting behaviour.

Fixes: 4e8f95f64d ("egl_dri2: Always unbind old contexts")
Fixes: 2907faee7a ("egl/dri2: try to bind old context if bindContext failed")
Signed-off-by: Frank Binns <frank.binns@imgtec.com>
Reviewed-by: Luigi Santivetti <luigi.santivetti@imgtec.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Tested-by: Nicolas Cortes <nicolas.g.cortes@intel.com>
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3328
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6105>
This commit is contained in:
Frank Binns 2020-07-28 15:50:30 +01:00 committed by Marge Bot
parent b9391c1d50
commit d0e32e5f81
1 changed files with 7 additions and 2 deletions
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9
src/egl/drivers/dri2/egl_dri2.c
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@ -1852,6 +1852,13 @@ dri2_make_current(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *dsurf,
tmp_rsurf == old_rsurf);
_eglLog(_EGL_WARNING, "DRI2: failed to rebind the previous context");
} else {
/* dri2_dpy->core->bindContext succeeded, so take a reference on the
* dri2_dpy. This prevents dri2_dpy from being reinitialized when a
* EGLDisplay is terminated and then initialized again while a
* context is still bound. See dri2_intitialize() for a more in depth
* explanation. */
dri2_dpy->ref_count++;
}
}
@ -1866,8 +1873,6 @@ dri2_make_current(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *dsurf,
if (egl_error != EGL_SUCCESS)
return _eglError(egl_error, "eglMakeCurrent");
dri2_dpy->ref_count++;
if (dsurf && _eglSurfaceHasMutableRenderBuffer(dsurf) &&
dri2_dpy->vtbl->set_shared_buffer_mode) {
/* Always update the shared buffer mode. This is obviously needed when