Hello Philippe CORNU,

This is a semi-automatic email about new static checker warnings.

The patch b706a25eaed0: "drm/stm: ltdc: add clut mode support" from 
Oct 26, 2017, leads to the following Smatch complaint:

    drivers/gpu/drm/stm/ltdc.c:395 ltdc_crtc_update_clut()
    warn: variable dereferenced before check 'crtc' (see line 390)

drivers/gpu/drm/stm/ltdc.c
   389  {
   390          struct ltdc_device *ldev = crtc_to_ltdc(crtc);
                                                        ^^^^
Dereferenced inside the function call

   391          struct drm_color_lut *lut;
   392          u32 val;
   393          int i;
   394  
   395          if (!crtc || !crtc->state)
                     ^^^^
Too late.

   396                  return;
   397  

regards,
dan carpenter
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