4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Wilson <[email protected]>

commit f21b9a92ca7c29382909eaab9facc2cf46f2cc0b upstream.

We can not allow the worker to run after its fbdev, or even the module,
has been removed.

Fixes: eaa434defaca ("drm/fb-helper: Add fb_deferred_io support")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Noralf Trønnes <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: [email protected]
Signed-off-by: Daniel Vetter <[email protected]>
Link: 
http://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 drivers/gpu/drm/drm_fb_helper.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -848,6 +848,8 @@ void drm_fb_helper_fini(struct drm_fb_he
        if (!drm_fbdev_emulation)
                return;
 
+       cancel_work_sync(&fb_helper->dirty_work);
+
        if (!list_empty(&fb_helper->kernel_fb_list)) {
                list_del(&fb_helper->kernel_fb_list);
                if (list_empty(&kernel_fb_helper_list)) {


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