From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
We do 'bestppm - 10' in vlv_find_best_dpll() but never check whether
that might underflow. Add such a check.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f8d67b2..f646fea 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -709,7 +709,7 @@ vlv_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc,
bestppm = 0;
flag = 1;
}
- if (ppm < bestppm - 10) {
+ if (bestppm >= 10 && ppm < bestppm - 10) {
bestppm = ppm;
flag = 1;
}
--
1.8.1.5
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