[bug report] drm/amdgpu/gfx6: clean up cu configuration

[Dan Carpenter]

On Sat, Apr 01, 2017 at 10:43:46AM +0800, Flora Cui wrote:
> >   3727          for (i = 0; i < adev->gfx.config.max_shader_engines; i++) {
> >   3728                  for (j = 0; j < adev->gfx.config.max_sh_per_se; j++) {
> >   3729                          mask = 1;
> >   3730                          ao_bitmap = 0;
> >   3731                          counter = 0;
> >   3732                          gfx_v6_0_select_se_sh(adev, i, j, 0xffffffff);
> >   3733                          if (i < 4 && j < 2)
> > 
> > If i == 4
> > 
> >   3734                                  gfx_v6_0_set_user_cu_inactive_bitmap(
> >   3735                                          adev, disable_masks[i * 2 + j]);
> >   3736                          bitmap = gfx_v6_0_get_cu_enabled(adev);
> >   3737                          cu_info->bitmap[i][j] = bitmap;
> > 
> > then we are beyond the end of this array.  Also, why was this patch even
> > applied when it has no commit message?  It's totally not clear to me
> > what the patch is trying to do or why it exists...
> adev->gfx.config.max_shader_engines is set in gfx_v6_0_gpu_init() and
> it must be < 4 so we'll never be beyond the end of the array.

Could you remove the condition then?  We should either check it always
or not at all.  We shouldn't check it half the time and assume it's
correct the other half.

regards,
dan carpenter