From a3d15c4b0ecd169c77dfdf659b2ff2e502179d19 Mon Sep 17 00:00:00 2001
From: Lyude Paul <lyude@redhat.com>
Date: Fri, 1 Feb 2019 19:20:02 -0500
Subject: [PATCH] drm/dp_mst: Remove port validation in
drm_dp_atomic_find_vcpi_slots()
Since we now have an easy way of refcounting drm_dp_mst_port structs and
safely accessing their contents, there isn't any good reason to keep
validating ports here. It doesn't prevent us from performing modesets on
branch devices that have been removed either, and we already disallow
enabling new displays on unregistered connectors in
update_connector_routing() in drm_atomic_check_modeset(). All it does is
cause us to have to make weird special exceptions in our atomic
modesetting code. So, get rid of it entirely.
Signed-off-by: Lyude Paul <lyude@redhat.com>
Fixes: eceae1472467 ("drm/dp_mst: Start tracking per-port VCPI allocations")
Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190202002023.29665-3-lyude@redhat.com
---
drivers/gpu/drm/drm_dp_mst_topology.c | 12 ++----------
drivers/gpu/drm/i915/intel_dp_mst.c | 17 ++++++-----------
drivers/gpu/drm/nouveau/dispnv50/disp.c | 3 +--
3 files changed, 9 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index db0fdc513b9c7..dc7ac0c605478 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -3117,10 +3117,6 @@ int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
if (IS_ERR(topology_state))
return PTR_ERR(topology_state);
- port = drm_dp_mst_topology_get_port_validated(mgr, port);
- if (port == NULL)
- return -EINVAL;
-
/* Find the current allocation for this port, if any */
list_for_each_entry(pos, &topology_state->vcpis, next) {
if (pos->port == port) {
@@ -3153,10 +3149,8 @@ int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
/* Add the new allocation to the state */
if (!vcpi) {
vcpi = kzalloc(sizeof(*vcpi), GFP_KERNEL);
- if (!vcpi) {
- ret = -ENOMEM;
- goto out;
- }
+ if (!vcpi)
+ return -ENOMEM;
drm_dp_mst_get_port_malloc(port);
vcpi->port = port;
@@ -3165,8 +3159,6 @@ int drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
vcpi->vcpi = req_slots;
ret = req_slots;
-out:
- drm_dp_mst_topology_put_port(port);
return ret;
}
EXPORT_SYMBOL(drm_dp_atomic_find_vcpi_slots);
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index b61e291367b43..5d8471f080d90 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -80,17 +80,12 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
pipe_config->pbn = mst_pbn;
- /* Zombie connectors can't have VCPI slots */
- if (!drm_connector_is_unregistered(connector)) {
- slots = drm_dp_atomic_find_vcpi_slots(state,
- &intel_dp->mst_mgr,
- port,
- mst_pbn);
- if (slots < 0) {
- DRM_DEBUG_KMS("failed finding vcpi slots:%d\n",
- slots);
- return slots;
- }
+ slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr, port,
+ mst_pbn);
+ if (slots < 0) {
+ DRM_DEBUG_KMS("failed finding vcpi slots:%d\n",
+ slots);
+ return slots;
}
intel_link_compute_m_n(bpp, lane_count,
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index 2e8a5fd9b2627..60d858c2f2ce4 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -771,8 +771,7 @@ nv50_msto_atomic_check(struct drm_encoder *encoder,
mstc->pbn = drm_dp_calc_pbn_mode(crtc_state->adjusted_mode.clock,
bpp);
- if (drm_atomic_crtc_needs_modeset(crtc_state) &&
- !drm_connector_is_unregistered(connector)) {
+ if (drm_atomic_crtc_needs_modeset(crtc_state)) {
slots = drm_dp_atomic_find_vcpi_slots(state, &mstm->mgr,
mstc->port, mstc->pbn);
if (slots < 0)
--
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