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drm/i915: Don't underflow bestppm 

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@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2013-09-24 21:26:21 +03:00 committed by Daniel Vetter
parent 69e4f900be
commit c686122c63
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_display.c
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@ -708,7 +708,7 @@ 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;
}