[PATCH 4.19 092/190] drm/nouveau: Dont WARN_ON VCPI allocation failures

From: Greg Kroah-Hartman
Date: Fri Sep 13 2019 - 09:16:33 EST

[ Upstream commit b513a18cf1d705bd04efd91c417e79e4938be093 ]

This is much louder then we want. VCPI allocation failures are quite
normal, since they will happen if any part of the modesetting process is
interrupted by removing the DP MST topology in question. So just print a
debugging message on VCPI failures instead.

Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
Fixes: f479c0ba4a17 ("drm/nouveau/kms/nv50: initial support for DP 1.2 multi-stream")
Cc: Ben Skeggs <bskeggs@xxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: nouveau@xxxxxxxxxxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx> # v4.10+
Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/gpu/drm/nouveau/dispnv50/disp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index f889d41a281fa..5e01bfb69d7a3 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -759,7 +759,8 @@ nv50_msto_enable(struct drm_encoder *encoder)

slots = drm_dp_find_vcpi_slots(&mstm->mgr, mstc->pbn);
r = drm_dp_mst_allocate_vcpi(&mstm->mgr, mstc->port, mstc->pbn, slots);
- WARN_ON(!r);
+ if (!r)
+ DRM_DEBUG_KMS("Failed to allocate VCPI\n");

if (!mstm->links++)