drm/i915: Ensure that the mode change flushing is currently uninterruptible
drm/i915: Ensure that the mode change flushing is currently uninterruptible

Introduced by 48b956c5, I had thought I had already fixed this. Oh well.

Reported-by: Sitsofe Wheeler <e18c5b5bfc46096909e8c59ff17640d7cfbe615a@yahoo.com>
Signed-off-by: Chris Wilson <711c73f64afdce07b7e38039a96d2224209e9a6c@chris-wilson.co.uk>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas