This avoids a divide by zero and warns appropriately on this serious bug.
Signed-off-by: Jesse Barnes <jbar...@virtuousgeek.org>
---
drivers/gpu/drm/i915/intel_display.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 8da1c96..9a83236 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5109,6 +5109,11 @@ static void vlv_crtc_clock_get(struct intel_crtc *crtc,
clock.p1 = (mdiv >> DPIO_P1_SHIFT) & 7;
clock.p2 = (mdiv >> DPIO_P2_SHIFT) & 0x1f;
+ if (!clock.n || !(clock.p1 * clock.p2)) {
+ WARN(1, "bad divider values on pipe %d\n", crtc->pipe);
+ return;
+ }
+
clock.vco = refclk * clock.m1 * clock.m2 / clock.n;
clock.dot = 2 * clock.vco / (clock.p1 * clock.p2);
--
1.8.3.1
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