4.13-stable review patch. If anyone has any objections, please let me know.
------------------ From: Ben Skeggs <[email protected]> commit 227f66d2f9954f68375736af62ebcd73c6754d69 upstream. Reported-by: Woody Suwalski <[email protected]> Signed-off-by: Ben Skeggs <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/gpu/drm/nouveau/nv50_display.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/nouveau/nv50_display.c +++ b/drivers/gpu/drm/nouveau/nv50_display.c @@ -3281,11 +3281,14 @@ nv50_mstm = { void nv50_mstm_service(struct nv50_mstm *mstm) { - struct drm_dp_aux *aux = mstm->mgr.aux; + struct drm_dp_aux *aux = mstm ? mstm->mgr.aux : NULL; bool handled = true; int ret; u8 esi[8] = {}; + if (!aux) + return; + while (handled) { ret = drm_dp_dpcd_read(aux, DP_SINK_COUNT_ESI, esi, 8); if (ret != 8) {
