drm/i915: Call drm_vblank_post_modeset() on error paths.

Ensure that the drm_vblank_pre_modeset() is always balanced by
drm_vblank_post_modeset() within intel_crtc_mode_set().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c5c45827ca01..a87eeffc2c8d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1598,6 +1598,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
         ok = limit->find_pll(limit, crtc, adjusted_mode->clock, refclk, &clock);
         if (!ok) {
                 DRM_ERROR("Couldn't find PLL settings for mode!\n");
+                drm_vblank_post_modeset(dev, pipe);
                 return -EINVAL;
         }
 
@@ -1858,12 +1859,9 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
 
         /* Flush the plane changes */
         ret = intel_pipe_set_base(crtc, x, y, old_fb);
-        if (ret != 0)
-            return ret;
-
         drm_vblank_post_modeset(dev, pipe);
 
-        return 0;
+        return ret;
 }
 
 /** Loads the palette/gamma unit for the CRTC with the prepared values */