drm/i915: Wrap -EIO send-vblank event for failed pageflip in spinlock

drm_send_vblank_event() demands that we hold the event spinlock whilst
calling it, so do so.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Fix the double lock as requested by Chris.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f4b8cb388dd6..c5079f2c49f3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10084,8 +10084,11 @@ free_work:
 out_hang:
                 intel_crtc_wait_for_pending_flips(crtc);
                 ret = intel_pipe_set_base(crtc, crtc->x, crtc->y, fb);
-                if (ret == 0 && event)
+                if (ret == 0 && event) {
+                        spin_lock_irqsave(&dev->event_lock, flags);
                         drm_send_vblank_event(dev, pipe, event);
+                        spin_unlock_irqrestore(&dev->event_lock, flags);
+                }
         }
         return ret;
 }