drm/amd/display: Fix crash on device remove/driver unload

Why:
DC core is being released from DM before it's referenced
from hpd_rx wq destruction code.

How: Move hpd_rx destruction before DC core destruction.
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -1572,6 +1572,18 @@ static void amdgpu_dm_fini(struct amdgpu_device *adev)
 				      &adev->dm.dmub_bo_gpu_addr,
 				      &adev->dm.dmub_bo_cpu_addr);
 
+	if (adev->dm.hpd_rx_offload_wq) {
+		for (i = 0; i < adev->dm.dc->caps.max_links; i++) {
+			if (adev->dm.hpd_rx_offload_wq[i].wq) {
+				destroy_workqueue(adev->dm.hpd_rx_offload_wq[i].wq);
+				adev->dm.hpd_rx_offload_wq[i].wq = NULL;
+			}
+		}
+
+		kfree(adev->dm.hpd_rx_offload_wq);
+		adev->dm.hpd_rx_offload_wq = NULL;
+	}
+
 	/* DC Destroy TODO: Replace destroy DAL */
 	if (adev->dm.dc)
 		dc_destroy(&adev->dm.dc);
@@ -1590,18 +1602,6 @@ static void amdgpu_dm_fini(struct amdgpu_device *adev)
 		adev->dm.freesync_module = NULL;
 	}
 
-	if (adev->dm.hpd_rx_offload_wq) {
-		for (i = 0; i < adev->dm.dc->caps.max_links; i++) {
-			if (adev->dm.hpd_rx_offload_wq[i].wq) {
-				destroy_workqueue(adev->dm.hpd_rx_offload_wq[i].wq);
-				adev->dm.hpd_rx_offload_wq[i].wq = NULL;
-			}
-		}
-
-		kfree(adev->dm.hpd_rx_offload_wq);
-		adev->dm.hpd_rx_offload_wq = NULL;
-	}
-
 	mutex_destroy(&adev->dm.audio_lock);
 	mutex_destroy(&adev->dm.dc_lock);