On Sat, Sep 21, 2019 at 01:55:25AM +0800, kbuild test robot wrote:
> tree: git://anongit.freedesktop.org/drm-intel drm-intel-next-queued
> head: 4bb6a9d5d9a8289673c4cb0786d44be8a63c21db
> commit: 6b97b118d4d542c7bc25b725c6de3947fffb921b [6/7] drm/i915/display: Extract ilk_read_luts()
>
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@xxxxxxxxx>
>
> New smatch warnings:
> drivers/gpu/drm/i915/display/intel_color.c:1576 ilk_read_lut_10() error: potential null dereference 'blob'. (drm_property_create_blob returns null)
It never returns null. Not sure why this thing thinks otherwise.
>
> Old smatch warnings:
> drivers/gpu/drm/i915/display/intel_color.c:1535 i9xx_read_lut_8() error: potential null dereference 'blob'. (drm_property_create_blob returns null)
>
> vim +/blob +1576 drivers/gpu/drm/i915/display/intel_color.c
>
> 1558
> 1559 static struct drm_property_blob *
> 1560 ilk_read_lut_10(const struct intel_crtc_state *crtc_state)
> 1561 {
> 1562 struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
> 1563 struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> 1564 u32 lut_size = INTEL_INFO(dev_priv)->color.gamma_lut_size;
> 1565 enum pipe pipe = crtc->pipe;
> 1566 struct drm_property_blob *blob;
> 1567 struct drm_color_lut *blob_data;
> 1568 u32 i, val;
> 1569
> 1570 blob = drm_property_create_blob(&dev_priv->drm,
> 1571 sizeof(struct drm_color_lut) * lut_size,
> 1572 NULL);
> 1573 if (IS_ERR(blob))
> 1574 return NULL;
> 1575
> > 1576 blob_data = blob->data;
> 1577
> 1578 for (i = 0; i < lut_size; i++) {
> 1579 val = I915_READ(PREC_PALETTE(pipe, i));
> 1580
> 1581 blob_data[i].red = intel_color_lut_pack(REG_FIELD_GET(
> 1582 PREC_PALETTE_RED_MASK, val), 10);
> 1583 blob_data[i].green = intel_color_lut_pack(REG_FIELD_GET(
> 1584 PREC_PALETTE_GREEN_MASK, val), 10);
> 1585 blob_data[i].blue = intel_color_lut_pack(REG_FIELD_GET(
> 1586 PREC_PALETTE_BLUE_MASK, val), 10);
> 1587 }
> 1588
> 1589 return blob;
> 1590 }
> 1591
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation
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--
Ville Syrjälä
Intel
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