diff options
| author | Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> | 2021-09-07 09:53:03 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-09-14 15:36:14 -0400 |
| commit | 06dd1888ee58d2529f55916e250f0e272b0b8407 (patch) | |
| tree | 5669c5f36df8fd84fbb1b30eaa3e42f59c64dec3 /drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | |
| parent | 8a4d393ef4977dd5b937f09753d603de9e29b9bf (diff) | |
| download | lwn-06dd1888ee58d2529f55916e250f0e272b0b8407.tar.gz lwn-06dd1888ee58d2529f55916e250f0e272b0b8407.zip | |
drm/amd/display: Add NULL checks for vblank workqueue
[Why]
If we're running a headless config with 0 links then the vblank
workqueue will be NULL - causing a NULL pointer exception during
any commit.
[How]
Guard access to the workqueue if it's NULL and don't queue or flush
work if it is.
Reported-by: Mike Lothian <mike@fireburn.co.uk>
BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1700
Fixes: 58aa1c50e5a231 ("drm/amd/display: Use vblank control events for PSR enable/disable")
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 53363728dbbd..24002a989196 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -6185,21 +6185,23 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable) return 0; #if defined(CONFIG_DRM_AMD_DC_DCN) - work = kzalloc(sizeof(*work), GFP_ATOMIC); - if (!work) - return -ENOMEM; + if (dm->vblank_control_workqueue) { + work = kzalloc(sizeof(*work), GFP_ATOMIC); + if (!work) + return -ENOMEM; - INIT_WORK(&work->work, vblank_control_worker); - work->dm = dm; - work->acrtc = acrtc; - work->enable = enable; + INIT_WORK(&work->work, vblank_control_worker); + work->dm = dm; + work->acrtc = acrtc; + work->enable = enable; - if (acrtc_state->stream) { - dc_stream_retain(acrtc_state->stream); - work->stream = acrtc_state->stream; - } + if (acrtc_state->stream) { + dc_stream_retain(acrtc_state->stream); + work->stream = acrtc_state->stream; + } - queue_work(dm->vblank_control_workqueue, &work->work); + queue_work(dm->vblank_control_workqueue, &work->work); + } #endif return 0; @@ -8809,7 +8811,8 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state, * If PSR or idle optimizations are enabled then flush out * any pending work before hardware programming. */ - flush_workqueue(dm->vblank_control_workqueue); + if (dm->vblank_control_workqueue) + flush_workqueue(dm->vblank_control_workqueue); #endif bundle->stream_update.stream = acrtc_state->stream; @@ -9144,7 +9147,8 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state) /* if there mode set or reset, disable eDP PSR */ if (mode_set_reset_required) { #if defined(CONFIG_DRM_AMD_DC_DCN) - flush_workqueue(dm->vblank_control_workqueue); + if (dm->vblank_control_workqueue) + flush_workqueue(dm->vblank_control_workqueue); #endif amdgpu_dm_psr_disable_all(dm); } |