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drm/nouveau/kms/nv50: fix oops during DP IRQ handling on non-MST boards

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Reported-by: Woody Suwalski <terraluna977@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Ben Skeggs 2017-10-03 16:24:28 +10:00
commit 227f66d2f9
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/nouveau/nv50_display.c
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@ -3265,11 +3265,14 @@ 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) {