FAILED: patch "[PATCH] drm/nouveau/kms/nv50: fix double dma_fence_put() when" failed to apply to 4.11-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.11-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

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

>From df60d1f23b09c5ce2a8e404012323d4deedcc589 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Wed, 5 Apr 2017 18:16:14 +1000
Subject: [PATCH] drm/nouveau/kms/nv50: fix double dma_fence_put() when
 destroying plane state

When the atomic support was added to nouveau, the DRM core did not do this.

However, later in the same merge window, a commit (drm/fence: add in-fences
support) was merged that added it, leading to use-after-frees of the fence
object.

Cc: stable@vger.kernel.org	[4.10+]
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c
index f4c8c326d66d..c9910c8537ed 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -1002,7 +1002,6 @@ nv50_wndw_atomic_destroy_state(struct drm_plane *plane,
 {
 	struct nv50_wndw_atom *asyw = nv50_wndw_atom(state);
 	__drm_atomic_helper_plane_destroy_state(&asyw->state);
-	dma_fence_put(asyw->state.fence);
 	kfree(asyw);
 }
 
@@ -1014,7 +1013,6 @@ nv50_wndw_atomic_duplicate_state(struct drm_plane *plane)
 	if (!(asyw = kmalloc(sizeof(*asyw), GFP_KERNEL)))
 		return NULL;
 	__drm_atomic_helper_plane_duplicate_state(plane, &asyw->state);
-	asyw->state.fence = NULL;
 	asyw->interval = 1;
 	asyw->sema = armw->sema;
 	asyw->ntfy = armw->ntfy;