[Intel-gfx] [PATCH] drm/i915: fixup i915_gem_object_get_page inline helper

[Daniel Vetter]

The obj->pages to obj->pages->sgl rework introduced this helper, but
it doesn't actually work for n % SG_MAX_SINGLE_ALLOC == 0.

This is exercised by the improved hangman tests and the gem_exec_big
test in i-g-t.

Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/i915_drv.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4f2831a..d3dbd0f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1341,7 +1341,7 @@ int __must_check i915_gem_object_get_pages(struct drm_i915_gem_object *obj);
 static inline struct page *i915_gem_object_get_page(struct drm_i915_gem_object *obj, int n)
 {
 	struct scatterlist *sg = obj->pages->sgl;
-	while (n >= SG_MAX_SINGLE_ALLOC) {
+	while (n >= SG_MAX_SINGLE_ALLOC - 1) {
 		sg = sg_chain_ptr(sg + SG_MAX_SINGLE_ALLOC - 1);
 		n -= SG_MAX_SINGLE_ALLOC - 1;
 	}
-- 
1.7.11.2