Patch "drm/amdgpu: fix crash in acp_hw_fini" has been added to the 4.8-stable tree

This is a note to let you know that I've just added the patch titled

    drm/amdgpu: fix crash in acp_hw_fini

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amdgpu-fix-crash-in-acp_hw_fini.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let [off-list ref] know about it.

From 757124d95c42bb579d67df51e51789849929ee31 Mon Sep 17 00:00:00 2001

From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 3 Nov 2016 17:47:51 -0400
Subject: drm/amdgpu: fix crash in acp_hw_fini

From: Alex Deucher <alexander.deucher@amd.com>

commit 757124d95c42bb579d67df51e51789849929ee31 upstream.

On CZ/ST systems with AZ rather than ACP audio, we need to bail
early in hw_fini since there is nothing to do.

bug: https://bugs.freedesktop.org/show_bug.cgi?id=98276

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c

@@ -395,9 +395,12 @@ static int acp_hw_fini(void *handle)
 {
 	int i, ret;
 	struct device *dev;
-
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
+	/* return early if no ACP */
+	if (!adev->acp.acp_genpd)
+		return 0;
+
 	for (i = 0; i < ACP_DEVS ; i++) {
 		dev = get_mfd_cell_dev(adev->acp.acp_cell[i].name, i);
 		ret = pm_genpd_remove_device(&adev->acp.acp_genpd->gpd, dev);

Patches currently in stable-queue which might be from alexander.deucher@amd.com are

queue-4.8/drm-radeon-disable-runtime-pm-in-certain-cases.patch
queue-4.8/drm-amdgpu-fix-crash-in-acp_hw_fini.patch
queue-4.8/drm-amdgpu-disable-runtime-pm-in-certain-cases.patch