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-rw-r--r--drivers/gpu/drm/vkms/vkms_crtc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index 5a095610726b..734a3e197df8 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -16,7 +16,7 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
vblank_hrtimer);
struct drm_crtc *crtc = &output->crtc;
struct vkms_crtc_state *state = to_vkms_crtc_state(crtc->state);
- int ret_overrun;
+ u64 ret_overrun;
bool ret;
spin_lock(&output->lock);
@@ -43,6 +43,8 @@ static enum hrtimer_restart vkms_vblank_simulate(struct hrtimer *timer)
ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
output->period_ns);
+ WARN_ON(ret_overrun != 1);
+
spin_unlock(&output->lock);
return HRTIMER_RESTART;