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egl/wayland: fix glthread crashes

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glthread unmarshalling thread cannot run concurrently with code that alloc
the back bo or the code that perform the swaps.
Ensure this by running dri2_flush_drawable_for_swapbuffers early.

Reviewed-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18223>
This commit is contained in:
Pierre-Eric Pelloux-Prayer 2022-09-09 15:18:17 +02:00 • committed by Marge Bot
parent eafe72a6cc
commit 58f90fd03f
1 changed files with 11 additions and 3 deletions
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14
src/egl/drivers/dri2/platform_wayland.c
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@ -1527,6 +1527,17 @@ dri2_wl_swap_buffers_with_damage(_EGLDisplay *disp,
if (dri2_surf->color_buffers[i].age > 0)
dri2_surf->color_buffers[i].age++;
/* Flush (and finish glthread) before:
* - update_buffers_if_needed because the unmarshalling thread
* may be running currently, and we would concurrently alloc/free
* the back bo.
* - swapping current/back because flushing may free the buffer and
* dri_image and reallocate them using get_back_bo (which causes a
* a crash because 'current' becomes NULL).
*/
dri2_flush_drawable_for_swapbuffers(disp, draw);
dri2_dpy->flush->invalidate(dri2_surf->dri_drawable);
/* Make sure we have a back buffer in case we're swapping without ever
* rendering. */
if (update_buffers_if_needed(dri2_surf) < 0)
@ -1589,9 +1600,6 @@ dri2_wl_swap_buffers_with_damage(_EGLDisplay *disp,
dri2_surf->base.Height, 0);
}
dri2_flush_drawable_for_swapbuffers(disp, draw);
dri2_dpy->flush->invalidate(dri2_surf->dri_drawable);
wl_surface_commit(dri2_surf->wl_surface_wrapper);
/* If we're not waiting for a frame callback then we'll at least throttle