[Intel-gfx] [PATCH 1/2] drm/i915: Assert all sg are initialised in fake_dma_object for selftests

[Chris Wilson]

Double check that we allocated the right amount of scatterlist elements
for our obj->size.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Matthew Auld <matthew.william.auld at gmail.com>
---
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 8e33a8bde78a..187444c37bbb 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -62,12 +62,14 @@ fake_get_pages(struct drm_i915_gem_object *obj)
 	for (sg = pages->sgl; sg; sg = sg_next(sg)) {
 		unsigned long len = min_t(typeof(rem), rem, BIT(31));
 
+		GEM_BUG_ON(!len);
 		sg_set_page(sg, pfn_to_page(PFN_BIAS), len, 0);
 		sg_dma_address(sg) = page_to_phys(sg_page(sg));
 		sg_dma_len(sg) = len;
 
 		rem -= len;
 	}
+	GEM_BUG_ON(rem);
 
 	obj->mm.madv = I915_MADV_DONTNEED;
 	return pages;
-- 
2.11.0