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SubjectRe: [PATCH v2 2/4] drm/dp_mst: Remove port validation in drm_dp_atomic_find_vcpi_slots()
On Thu, Jan 31, 2019 at 08:14:49PM -0500, Lyude Paul wrote:
> 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")
> Cc: Daniel Vetter <daniel@ffwll.ch>
> ---
> 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 abb0ea8ba9d9..4325e1518286 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) {

Also noticed that the WARN_ON() return -EINVAL; here gets fixed with this
patch.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> @@ -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 cdb83d294cdd..fb67cd931117 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 2e8a5fd9b262..60d858c2f2ce 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)
> --
> 2.20.1
>

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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