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| author |   Lyude Paul <lyude@redhat.com> | 2019-01-10 19:53:42 -0500 |
|---|---|---|
| committer | Lyude Paul <lyude@redhat.com> | 2019-01-10 20:45:25 -0500 |
| commit | 5e187a01426d220df1ab3c58f40cefd40094695e (patch) | |
| tree | e7f324b71eb6eb7b8c56bf98cc4349d83a9d54b5 | |
| parent | drm/dp_mst: Start tracking per-port VCPI allocations (diff) | |
| download | linux-dev-5e187a01426d220df1ab3c58f40cefd40094695e.tar.xz linux-dev-5e187a01426d220df1ab3c58f40cefd40094695e.zip | |
drm/dp_mst: Check payload count in drm_dp_mst_atomic_check()
It occurred to me that we never actually check this! So let's start
doing that.
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: David Airlie <airlied@redhat.com>
Cc: Jerry Zuo <Jerry.Zuo@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Juston Li <juston.li@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190111005343.17443-20-lyude@redhat.com
| -rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 88db6d7e1a36..196ebba8af5f 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -3641,7 +3641,7 @@ drm_dp_mst_atomic_check_topology_state(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_topology_state *mst_state) { struct drm_dp_vcpi_allocation *vcpi; - int avail_slots = 63; + int avail_slots = 63, payload_count = 0; list_for_each_entry(vcpi, &mst_state->vcpis, next) { /* Releasing VCPI is always OK-even if the port is gone */ @@ -3661,6 +3661,12 @@ drm_dp_mst_atomic_check_topology_state(struct drm_dp_mst_topology_mgr *mgr, avail_slots + vcpi->vcpi); return -ENOSPC; } + + if (++payload_count > mgr->max_payloads) { + DRM_DEBUG_ATOMIC("[MST MGR:%p] state %p has too many payloads (max=%d)\n", + mgr, mst_state, mgr->max_payloads); + return -EINVAL; + } } DRM_DEBUG_ATOMIC("[MST MGR:%p] mst state %p VCPI avail=%d used=%d\n", mgr, mst_state, avail_slots, |