drm/panfrost: Fix scheduler workqueue bug

When the GPU scheduler was ported to using a struct for its
initialization parameters, it was overlooked that panfrost creates a
distinct workqueue for timeout handling.

The pointer to this new workqueue is not initialized to the struct,
resulting in NULL being passed to the scheduler, which then uses the
system_wq for timeout handling.

Set the correct workqueue to the init args struct.

Cc: stable@vger.kernel.org # 6.15+
Fixes: 796a9f5 ("drm/sched: Use struct for drm_sched_init() params")
Reported-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Closes: https://lore.kernel.org/dri-devel/b5d0921c-7cbf-4d55-aa47-c35cd7861c02@igalia.com/
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20250709102957.100849-2-phasta@kernel.org

Author: Philipp Stanner

drivers/gpu/drm/panfrost/panfrost_job.c

@@ -841,7 +841,6 @@ int panfrost_job_init(struct panfrost_device *pfdev)
 		.num_rqs = DRM_SCHED_PRIORITY_COUNT,
 		.credit_limit = 2,
 		.timeout = msecs_to_jiffies(JOB_TIMEOUT_MS),
-		.timeout_wq = pfdev->reset.wq,
 		.name = "pan_js",
 		.dev = pfdev->dev,
 	};
@@ -879,6 +878,7 @@ int panfrost_job_init(struct panfrost_device *pfdev)
 	pfdev->reset.wq = alloc_ordered_workqueue("panfrost-reset", 0);
 	if (!pfdev->reset.wq)
 		return -ENOMEM;
+	args.timeout_wq = pfdev->reset.wq;
 
 	for (j = 0; j < NUM_JOB_SLOTS; j++) {
 		js->queue[j].fence_context = dma_fence_context_alloc(1);