[Intel-gfx] [PATCH] drm/i915: Quieten compiler warning for ctch_open()

[Chris Wilson]

Sparse sees that vma may be NULL, but doesn't realise that the
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 <chris at chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Oscar Mateo <oscar.mateo at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
 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