Patch "drm/i915: prevent crash with .disable_display parameter" has been added to the 4.9-stable tree

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

drm/i915: prevent crash with .disable_display parameter

to the 4.9-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-i915-prevent-crash-with-.disable_display-parameter.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Clint Taylor <[email protected]>
Date: Wed, 18 Jan 2017 13:38:43 -0800
Subject: drm/i915: prevent crash with .disable_display parameter

From: Clint Taylor <[email protected]>

commit 27892bbdc9233f33bf0f44e08aab8f12e0dec142 upstream.

The .disable_display parameter was causing a fatal crash when fbdev was dereferenced during driver init.

V1: protection in i915_drv.c
V2: Moved protection to intel_fbdev.c

Testcase: igt/drv_module_reload/basic-no-display

---
 drivers/gpu/drm/i915/intel_fbdev.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -745,6 +745,9 @@ void intel_fbdev_initial_config_async(st
 {
 	struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
 
+	if (!ifbdev)
+		return;
+
 	ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
 }
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/drm-i915-prevent-crash-with-.disable_display-parameter.patch