WTF: patch "[PATCH] drm/amdgpu: update rev id for pitcairn" was seriously submitted to be applied to the 4.9-stable tree?

[<gregkh@linuxfoundation.org>]

The patch below was submitted to be applied to the 4.9-stable tree.

I fail to see how this patch meets the stable kernel rules as found at
Documentation/stable_kernel_rules.txt.

I could be totally wrong, and if so, please respond to 
<stable@vger.kernel.org> and let me know why this patch should be
applied.  Otherwise, it is now dropped from my patch queues, never to be
seen again.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From e285a9a64d64e65a10e97c6ae1e9385c9595b563 Mon Sep 17 00:00:00 2001
From: Flora Cui <Flora.Cui@amd.com>
Date: Thu, 15 Dec 2016 15:29:54 +0800
Subject: [PATCH] drm/amdgpu: update rev id for pitcairn

Signed-off-by: Flora Cui <Flora.Cui@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/amdgpu/si.c b/drivers/gpu/drm/amd/amdgpu/si.c
index 19b511e984dc..cf8a0a104875 100644
--- a/drivers/gpu/drm/amd/amdgpu/si.c
+++ b/drivers/gpu/drm/amd/amdgpu/si.c
@@ -1212,6 +1212,7 @@ static int si_common_early_init(void *handle)
 			AMD_CG_SUPPORT_HDP_LS |
 			AMD_CG_SUPPORT_HDP_MGCG;
 		adev->pg_flags = 0;
+		adev->external_rev_id = adev->rev_id + 20;
 		break;
 
 	case CHIP_VERDE: