UPSTREAM: drm/virtio: fix resource id creation race

commit fbb30168c7395b9cfeb9e6f7b0c0bca854a6552d upstream.

The previous code was not thread safe and caused
undefined behavior from spurious duplicate resource IDs.
In this patch, an atomic_t is used instead. We no longer
see any duplicate IDs in tests with this change.

Fixes: 16065fcdd19d ("drm/virtio: do NOT reuse resource ids")
Signed-off-by: John Bates <jbates@chromium.org>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200220225319.45621-1-jbates@chromium.org


Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 9998ebb5e73c72ba11a025434be9c2ff1c33b1f0)
Bug: 153580313
Signed-off-by: Alistair Delva <adelva@google.com>
Change-Id: Iad0ca447e5be8b8098962b50e8d38356d1024126