st/mesa: use mutex in st_get_texture_sampler_view_from_stobj
st_texture_release_all_sampler_views uses the validate_mutex,
but st_get_texture_sampler_view_from_stobj didn't.
Since they both modify stObj->view we could have threadA in
st_get_texture_sampler_view_from_stobj with a non-NULL sv,
so expecting sv->view to be non-NULL, while threadB was in
st_texture_release_all_sampler_views clearing sv->view.
It's also needed to protect st_sampler_view::private_refcount,
which is supposed to be used from the owning context thread,
but can also be used by any context in st_texture_release_all_sampler_views.
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/6088
Fixes: ef5d4274132 ("st/mesa: add a mechanism to bypass atomics when binding sampler views")
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16779>
1 file changed
