Merge tag 'drm-misc-next-2025-09-04' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-next

drm-misc-next for v6.18:

Cross-subsystem Changes:

- Update a number of DT bindings for STM32MP25 Arm SoC

Core Changes:

gem:
- Simplify locking for GPUVM

panel-backlight-quirks:
- Add additional quirks for EDID, DMI, brightness

sched:
- Fix race condition in trace code
- Clean up

sysfb:
- Clean up

Driver Changes:

amdgpu:
- Give kernel jobs a unique id for better tracing

amdxdna:
- Improve error reporting

bridge:
- Improve ref counting on bridge management
- adv7511: Provide SPD and HDMI infoframes
- it6505: Replace crypto_shash with sha()
- synopsys: Add support for DW DPTX Controller plus DT bindings

gud:
- Replace simple-KMS pipe with regular atomic helpers

imagination:
- Improve power management
- Add support for TH1520 GPU
- Support Risc-V architectures

ivpu:
- Clean up

nouveau:
- Improve error reporting

panthor:
- Fail VM bind if BO has offset
- Clean up

rcar-du:
- Make number of lanes configurable

rockchip:
- Add support for RK3588 DPTX output

rocket:
- Use kfree() and sizeof() correctly
- Test DMA status
- Clean up

sitronix:
- st7571-i2c: Add support for inverted displays and 2-bit grayscale
- Clean up

stm:
- ltdc: Add support support for STM32MP257F-EV1 plus DT bindings

tidss:
- Convert to kernel's FIELD_ macros

v3d:
- Improve job management and locking

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://lore.kernel.org/r/20250904090932.GA193997@linux.fritz.box

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 5a550fd76bf0..46119aacb809 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -1424,6 +1424,22 @@ void drm_sched_fini(struct drm_gpu_scheduler *sched)
 			 * Prevents reinsertion and marks job_queue as idle,
 			 * it will be removed from the rq in drm_sched_entity_fini()
 			 * eventually
+			 *
+			 * FIXME:
+			 * This lacks the proper spin_lock(&s_entity->lock) and
+			 * is, therefore, a race condition. Most notably, it
+			 * can race with drm_sched_entity_push_job(). The lock
+			 * cannot be taken here, however, because this would
+			 * lead to lock inversion -> deadlock.
+			 *
+			 * The best solution probably is to enforce the life
+			 * time rule of all entities having to be torn down
+			 * before their scheduler. Then, however, locking could
+			 * be dropped alltogether from this function.
+			 *
+			 * For now, this remains a potential race in all
+			 * drivers that keep entities alive for longer than
+			 * the scheduler.
 			 */
 			s_entity->stopped = true;
 		spin_unlock(&rq->lock);