[PATCH] drm: Fix error path in drm_mode_page_flip_ioctl()

[Imre Deak]

This fixes the error path for platforms that don't define the new
page_flip_target() hook.

Fixes: c229bfbbd04 ("drm: Add page_flip_target CRTC hook v2")
Testcase: igt/kms_flip/basic-flip-vs-dpms
CC: Michel Dänzer <michel.daenzer at amd.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/drm_crtc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 0f797ee..d84a0ea 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2047,7 +2047,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
        }

 out:
-       if (ret)
+       if (ret && crtc->funcs->page_flip_target)
                drm_crtc_vblank_put(crtc);
        if (fb)
                drm_framebuffer_unreference(fb);
-- 
2.5.0