[RFC PATCH 2/3] drm/sched: fix drm_sched_tdr_queue_imm to not corrupt timeout value

[Sanjay Yadav <sanjay.kumar.yadav@intel.com>]

drm_sched_tdr_queue_imm() sets sched->timeout to 0 and never restores
it. This breaks all future TDR timers — jobs get timed out instantly
before they even start running on hardware.

Use mod_delayed_work() directly to fire the TDR worker immediately
without modifying the timeout field. This preserves the original
timeout value for subsequent job submissions.

Fixes: 8ec5a4e5ce97 ("drm/xe: Resume TDR after GT reset")
Cc: <stable@vger.kernel.org> # v6.13+
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Assisted-by: Claude:claude-opus-4.6
Suggested-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Signed-off-by: Sanjay Yadav <sanjay.kumar.yadav@intel.com>
---
 drivers/gpu/drm/scheduler/sched_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 818d3d4434b5..be144e244745 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -212,8 +212,8 @@ static void drm_sched_start_timeout_unlocked(struct drm_gpu_scheduler *sched)
 void drm_sched_tdr_queue_imm(struct drm_gpu_scheduler *sched)
 {
 	spin_lock(&sched->job_list_lock);
-	sched->timeout = 0;
-	drm_sched_start_timeout(sched);
+	if (!list_empty(&sched->pending_list))
+		mod_delayed_work(sched->timeout_wq, &sched->work_tdr, 0);
 	spin_unlock(&sched->job_list_lock);
 }
 EXPORT_SYMBOL(drm_sched_tdr_queue_imm);
-- 
2.52.0