Quoting Chris Wilson (2017-06-03 18:50:02)
> Sparse sees that vma may be NULL, but doesn't realise that the
s/sparse/smatch/
> constructor will set vma or flag an error. Give is a BUG_ON so it knows
> that vma is non-NULL afterwards.
>
> drivers/gpu/drm/i915/intel_guc_ct.c:204 ctch_open() error: we previously
> assumed 'ctch->vma' could be null (see line 197)
>
> Fixes: f8a58d639dd9 ("drm/i915/guc: Introduce buffer based cmd transport")
> Signed-off-by: Chris Wilson <[email protected]>
> Cc: Michal Wajdeczko <[email protected]>
> Cc: Daniele Ceraolo Spurio <[email protected]>
> Cc: Oscar Mateo <[email protected]>
> Cc: Joonas Lahtinen <[email protected]>
> ---
> drivers/gpu/drm/i915/intel_guc_ct.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_guc_ct.c
> b/drivers/gpu/drm/i915/intel_guc_ct.c
> index c4cbec140101..49ccf9090641 100644
> --- a/drivers/gpu/drm/i915/intel_guc_ct.c
> +++ b/drivers/gpu/drm/i915/intel_guc_ct.c
> @@ -199,6 +199,7 @@ static int ctch_open(struct intel_guc *guc,
> if (unlikely(err))
> goto err_out;
> }
> + GEM_BUG_ON(!ctch->vma);
>
> /* vma should be already allocated and map'ed */
> base = guc_ggtt_offset(ctch->vma);
> --
> 2.11.0
>
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