drm/amd/display: Avoid HPD IRQ in GPU reset state

[Why]
If GPU is in reset state, force enabling link will cause
unexpected behaviour.

[How]
Avoid handling HPD IRQ when GPU is in reset state.
Signed-off-by: Zhan Liu <zhan.liu@amd.com>
Reviewed-by: Nikola Cornij <nikola.cornij@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -2768,15 +2768,15 @@ static void handle_hpd_rx_irq(void *param)
 		}
 	}
 
-	if (!amdgpu_in_reset(adev))
+	if (!amdgpu_in_reset(adev)) {
 		mutex_lock(&adev->dm.dc_lock);
 #ifdef CONFIG_DRM_AMD_DC_HDCP
 	result = dc_link_handle_hpd_rx_irq(dc_link, &hpd_irq_data, NULL);
 #else
 	result = dc_link_handle_hpd_rx_irq(dc_link, NULL, NULL);
 #endif
-	if (!amdgpu_in_reset(adev))
 		mutex_unlock(&adev->dm.dc_lock);
+	}
 
 out:
 	if (result && !is_mst_root_connector) {