[PATCH 2/2] drm/i915: lock event_lock for drm_vblank_off()

[Imre Deak <imre.deak@intel.com>]

drm_vblank_off() requires callers to hold the event_lock.

Signed-off-by: Imre Deak <imre.deak@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b453901..56f1119 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3413,6 +3413,7 @@ static void ironlake_crtc_disable(struct drm_crtc *crtc)
 	struct intel_encoder *encoder;
 	int pipe = intel_crtc->pipe;
 	int plane = intel_crtc->plane;
+	unsigned long flags;
 	u32 reg, temp;
 
 
@@ -3423,7 +3424,11 @@ static void ironlake_crtc_disable(struct drm_crtc *crtc)
 		encoder->disable(encoder);
 
 	intel_crtc_wait_for_pending_flips(crtc);
+
+	spin_lock_irqsave(&dev->event_lock, flags);
 	drm_vblank_off(dev, pipe);
+	spin_unlock_irqrestore(&dev->event_lock, flags);
+
 	intel_crtc_update_cursor(crtc, false);
 
 	intel_disable_plane(dev_priv, plane, pipe);
@@ -3495,6 +3500,7 @@ static void haswell_crtc_disable(struct drm_crtc *crtc)
 	int plane = intel_crtc->plane;
 	enum transcoder cpu_transcoder = intel_crtc->cpu_transcoder;
 	bool is_pch_port;
+	unsigned long flags;
 
 	if (!intel_crtc->active)
 		return;
@@ -3505,7 +3511,11 @@ static void haswell_crtc_disable(struct drm_crtc *crtc)
 		encoder->disable(encoder);
 
 	intel_crtc_wait_for_pending_flips(crtc);
+
+	spin_lock_irqsave(&dev->event_lock, flags);
 	drm_vblank_off(dev, pipe);
+	spin_unlock_irqrestore(&dev->event_lock, flags);
+
 	intel_crtc_update_cursor(crtc, false);
 
 	intel_disable_plane(dev_priv, plane, pipe);
@@ -3617,6 +3627,7 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
 	struct intel_encoder *encoder;
 	int pipe = intel_crtc->pipe;
 	int plane = intel_crtc->plane;
+	unsigned long flags;
 
 
 	if (!intel_crtc->active)
@@ -3627,7 +3638,11 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc)
 
 	/* Give the overlay scaler a chance to disable if it's on this pipe */
 	intel_crtc_wait_for_pending_flips(crtc);
+
+	spin_lock_irqsave(&dev->event_lock, flags);
 	drm_vblank_off(dev, pipe);
+	spin_unlock_irqrestore(&dev->event_lock, flags);
+
 	intel_crtc_dpms_overlay(intel_crtc, false);
 	intel_crtc_update_cursor(crtc, false);
 
-- 
1.7.9.5