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

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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>
This commit is contained in:
Hai Lan 2012-02-15 19:07:02 +08:00 committed by Jesse Barnes
parent 5ca0c34ae2
commit 4e9bb47bd2
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/i915/intel_display.c
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@ -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;