From: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Date: Wed, 15 Mar 2023 11:31:27 +0000 (+0300)
Subject: drm/i915: fix MAX_ORDER usage in i915_gem_object_get_pages_internal()
X-Git-Tag: v6.6.7~2970^2~268
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=50c00d2c686e52c0dd9b5bddc6727f6c442cbcc0;p=platform%2Fkernel%2Flinux-starfive.git

drm/i915: fix MAX_ORDER usage in i915_gem_object_get_pages_internal()

MAX_ORDER is not inclusive: the maximum allocation order buddy allocator
can deliver is MAX_ORDER-1.

Fix MAX_ORDER usage in i915_gem_object_get_pages_internal().

Link: https://lkml.kernel.org/r/20230315113133.11326-5-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_internal.c b/drivers/gpu/drm/i915/gem/i915_gem_internal.c
index 6bc26b4..eae9e9f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_internal.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_internal.c
@@ -36,7 +36,7 @@ static int i915_gem_object_get_pages_internal(struct drm_i915_gem_object *obj)
 	struct sg_table *st;
 	struct scatterlist *sg;
 	unsigned int npages; /* restricted by sg_alloc_table */
-	int max_order = MAX_ORDER;
+	int max_order = MAX_ORDER - 1;
 	unsigned int max_segment;
 	gfp_t gfp;