drm/i915: Handle drm_atomic_helper_swap_state failure
drm_atomic_helper_swap_state() will be changed to interruptible waiting in the next few commits, so all drivers have to be changed to handling failure. Signed-off-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170711143314.2148-6-maarten.lankhorst@linux.intel.comReviewed-by: NSean Paul <seanpaul@chromium.org> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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