Hi, On Thu, Feb 02, 2023 at 03:15:46PM +0300, Dan Carpenter wrote: > Hi Imre, > > url: https://github.com/intel-lab-lkp/linux/commits/Imre-Deak/drm-i915-dp_mst-Add-the-MST-topology-state-for-modesetted-CRTCs/20230131-230853 > base: git://anongit.freedesktop.org/drm/drm-tip drm-tip > patch link: https://lore.kernel.org/r/20230131150548.1614458-12-imre.deak%40intel.com > patch subject: [PATCH v2 11/17] drm/display/dp_mst: Add helpers to query for payload allocation errors > config: x86_64-randconfig-m001 (https://download.01.org/0day-ci/archive/20230202/202302021855.yyqIeQ2o-lkp@xxxxxxxxx/config) > compiler: gcc-11 (Debian 11.3.0-8) 11.3.0 > > If you fix the issue, kindly add following tag where applicable > | Reported-by: kernel test robot <lkp@xxxxxxxxx> > | Reported-by: Dan Carpenter <error27@xxxxxxxxx> > > smatch warnings: > drivers/gpu/drm/display/drm_dp_mst_topology.c:3316 drm_dp_add_payload_part1() warn: missing error code 'ret' > > vim +/ret +3316 drivers/gpu/drm/display/drm_dp_mst_topology.c > > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3304 int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr, > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3305 struct drm_dp_mst_topology_state *mst_state, > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3306 struct drm_dp_mst_atomic_payload *payload) > ad7f8a1f9ced7f drivers/gpu/drm/drm_dp_mst_topology.c Dave Airlie 2014-06-05 3307 { > ad7f8a1f9ced7f drivers/gpu/drm/drm_dp_mst_topology.c Dave Airlie 2014-06-05 3308 struct drm_dp_mst_port *port; > 5c4df7ffba973b drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2023-01-31 3309 int ret = 0; > 706246c761ddd3 drivers/gpu/drm/drm_dp_mst_topology.c Lyude Paul 2018-12-13 3310 > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3311 port = drm_dp_mst_topology_get_port_validated(mgr, payload->port); > 33f960e23c29d1 drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2022-12-14 3312 if (!port) { > 33f960e23c29d1 drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2022-12-14 3313 drm_dbg_kms(mgr->dev, > 33f960e23c29d1 drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2022-12-14 3314 "VCPI %d for port %p not in topology, not creating a payload\n", > 33f960e23c29d1 drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2022-12-14 3315 payload->vcpi, payload->port); > 5c4df7ffba973b drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2023-01-31 @3316 goto alloc_fail; > > Hard to tell if this is an error path or a success path. thanks for the report. The function before the change in this patchset returned 0 in this case, so I didn't want to change that. Looking at the callers none of them uses the return value (except for printing an error message). I think returning an error code in this case as well would be more consistent, but that change should be a follow-up. > 33f960e23c29d1 drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2022-12-14 3317 } > cfe9f90358d97a drivers/gpu/drm/drm_dp_mst_topology.c Lyude Paul 2019-01-10 3318 > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3319 if (mgr->payload_count == 0) > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3320 mgr->next_start_slot = mst_state->start_slot; > 3769e4c0af5b82 drivers/gpu/drm/drm_dp_mst_topology.c Wayne Lin 2021-06-16 3321 > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3322 payload->vc_start_slot = mgr->next_start_slot; > cfe9f90358d97a drivers/gpu/drm/drm_dp_mst_topology.c Lyude Paul 2019-01-10 3323 > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3324 ret = drm_dp_create_payload_step1(mgr, payload); > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3325 drm_dp_mst_topology_put_port(port); > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3326 if (ret < 0) { > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3327 drm_warn(mgr->dev, "Failed to create MST payload for port %p: %d\n", > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3328 payload->port, ret); > 5c4df7ffba973b drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2023-01-31 3329 goto alloc_fail; > ad7f8a1f9ced7f drivers/gpu/drm/drm_dp_mst_topology.c Dave Airlie 2014-06-05 3330 } > dfda0df3426483 drivers/gpu/drm/drm_dp_mst_topology.c Dave Airlie 2014-08-06 3331 > 5c4df7ffba973b drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2023-01-31 3332 payload->alloc_failed = false; > 5c4df7ffba973b drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2023-01-31 3333 > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3334 mgr->payload_count++; > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3335 mgr->next_start_slot += payload->time_slots; > ad7f8a1f9ced7f drivers/gpu/drm/drm_dp_mst_topology.c Dave Airlie 2014-06-05 3336 > 4d07b0bc403403 drivers/gpu/drm/display/drm_dp_mst_topology.c Lyude Paul 2022-08-17 3337 return 0; > 5c4df7ffba973b drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2023-01-31 3338 > 5c4df7ffba973b drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2023-01-31 3339 alloc_fail: > 5c4df7ffba973b drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2023-01-31 3340 payload->vc_start_slot = -1; > 5c4df7ffba973b drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2023-01-31 3341 payload->alloc_failed = true; > 5c4df7ffba973b drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2023-01-31 3342 > 5c4df7ffba973b drivers/gpu/drm/display/drm_dp_mst_topology.c Imre Deak 2023-01-31 3343 return ret; > ad7f8a1f9ced7f drivers/gpu/drm/drm_dp_mst_topology.c Dave Airlie 2014-06-05 3344 } > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests >
