accel/ivpu: Reorder Doorbell Unregister and Command Queue Destruction

Refactor ivpu_cmdq_unregister() to ensure the doorbell is unregistered
before destroying the command queue. The NPU firmware requires doorbells
to be unregistered prior to command queue destruction.

If doorbell remains registered when command queue destroy command is sent
firmware will automatically unregister the doorbell, making subsequent
unregister attempts no-operations (NOPs).

Ensure compliance with firmware expectations by moving the doorbell
unregister call ahead of the command queue destruction logic,
thus preventing unnecessary NOP operation.

Fixes: 465a391 ("accel/ivpu: Add API for command queue create/destroy/submit")
Signed-off-by: Karol Wachowski <karol.wachowski@intel.com>
Reviewed-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Link: https://lore.kernel.org/r/20250515094124.255141-1-jacek.lawrynowicz@linux.intel.com

Author: kwachows

drivers/accel/ivpu/ivpu_job.c

@@ -247,17 +247,17 @@ static int ivpu_cmdq_unregister(struct ivpu_file_priv *file_priv, struct ivpu_cm
 	if (!cmdq->db_id)
 		return 0;
 
+	ret = ivpu_jsm_unregister_db(vdev, cmdq->db_id);
+	if (!ret)
+		ivpu_dbg(vdev, JOB, "DB %d unregistered\n", cmdq->db_id);
+
 	if (vdev->fw->sched_mode == VPU_SCHEDULING_MODE_HW) {
 		ret = ivpu_jsm_hws_destroy_cmdq(vdev, file_priv->ctx.id, cmdq->id);
 		if (!ret)
 			ivpu_dbg(vdev, JOB, "Command queue %d destroyed, ctx %d\n",
 				 cmdq->id, file_priv->ctx.id);
 	}
 
-	ret = ivpu_jsm_unregister_db(vdev, cmdq->db_id);
-	if (!ret)
-		ivpu_dbg(vdev, JOB, "DB %d unregistered\n", cmdq->db_id);
-
 	xa_erase(&file_priv->vdev->db_xa, cmdq->db_id);
 	cmdq->db_id = 0;