drm/i915: fix a sprite watermark computation to avoid divide by zero if xpos<0

When setting overlay position with x<0, it will divide 0 and make drm
driver crash.

Signed-off-by: Hai Lan <hai.lan@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f3afec2854d8..e654f32de197 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4680,8 +4680,17 @@ sandybridge_compute_sprite_srwm(struct drm_device *dev, int plane,
 
         crtc = intel_get_crtc_for_plane(dev, plane);
         clock = crtc->mode.clock;
+        if (!clock) {
+                *sprite_wm = 0;
+                return false;
+        }
 
         line_time_us = (sprite_width * 1000) / clock;
+        if (!line_time_us) {
+                *sprite_wm = 0;
+                return false;
+        }
+
         line_count = (latency_ns / line_time_us + 1000) / 1000;
         line_size = sprite_width * pixel_size;