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drm/i915: avoid division by zero on cnl_calc_wrpll_link

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If for some unexpected reason the registers all read zero it's better
to WARN and return instead of dividing by zero and completely freezing
the machine.

I don't expect this to happen in the wild with the current code, but I
accidentally triggered the division by zero while doing some debugging
in an unusual environment.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171005213842.11423-2-paulo.r.zanoni@intel.com
This commit is contained in:
Paulo Zanoni 2017-10-05 18:38:42 -03:00
parent 2de3813880
commit 0e005888b8
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_ddi.c
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@ -1220,6 +1220,9 @@ static int cnl_calc_wrpll_link(struct drm_i915_private *dev_priv,
dco_freq += (((cfgcr0 & DPLL_CFGCR0_DCO_FRACTION_MASK) >>
DPLL_CFGCR0_DCO_FRACTION_SHIFT) * ref_clock) / 0x8000;
if (WARN_ON(p0 == 0 || p1 == 0 || p2 == 0))
return 0;
return dco_freq / (p0 * p1 * p2 * 5);
}