[PATCH v4 6/7] drm/i915: Use error code as -E2BIG when the size of gem ttm object is too large

[Gwan-gyeong Mun]

The ttm_bo_init_reserved() functions returns -ENOSPC if the size is too big
to add vma. The direct function that returns -ENOSPC is 
drm_mm_insert_node_in_range().
To handle the same error as other code returning -E2BIG when the size is
too large, it converts return value to -E2BIG.

Signed-off-by: Gwan-gyeong Mun <gwan-gyeong....@intel.com>
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.a...@intel.com>
Cc: Thomas Hellström <thomas.hellst...@linux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy....@intel.com>
Reviewed-by: Mauro Carvalho Chehab <mche...@kernel.org>
---
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c 
b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 88f2887627dc..4d478bf325be 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -1249,6 +1249,17 @@ int __i915_gem_ttm_object_init(struct 
intel_memory_region *mem,
        ret = ttm_bo_init_reserved(&i915->bdev, i915_gem_to_ttm(obj), bo_type,
                                   &i915_sys_placement, page_size >> PAGE_SHIFT,
                                   &ctx, NULL, NULL, i915_ttm_bo_destroy);
+
+       /*
+        * XXX: The ttm_bo_init_reserved() functions returns -ENOSPC if the size
+        * is too big to add vma. The direct function that returns -ENOSPC is
+        * drm_mm_insert_node_in_range(). To handle the same error as other code
+        * that returns -E2BIG when the size is too large, it converts -ENOSPC 
to
+        * -E2BIG.
+        */
+       if (size >> PAGE_SHIFT > INT_MAX && ret == -ENOSPC)
+               ret = -E2BIG;
+
        if (ret)
                return i915_ttm_err_to_gem(ret);
 
-- 
2.34.1