[PATCH] drm/i915/ttm: Fix TTM_PL_FLAG_DESIRED

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

inlined from ‘i915_ttm_get_pages’ at ../drivers/gpu/drm/i915/gem/i915_gem_ttm.c:847:2:
../drivers/gpu/drm/i915/gem/i915_gem_ttm.c:165:18: warning: ‘places[0].flags’ is used uninitialized [-Wuninitialized]
  165 |         places[0].flags |= TTM_PL_FLAG_DESIRED;
      |         ~~~~~~~~~^~~~~~
../drivers/gpu/drm/i915/gem/i915_gem_ttm.c: In function ‘i915_ttm_get_pages’:
../drivers/gpu/drm/i915/gem/i915_gem_ttm.c:837:26: note: ‘places’ declared here
  837 |         struct ttm_place places[I915_TTM_MAX_PLACEMENTS + 1];
      |                          ^~~~~~

Furhermore we then proceed to call i915_ttm_place_from_region() which
memset()s the whole thing back to zero anyway. So in the end we lose
the TTM_PL_FLAG_DESIRED flag (and fortunately also whatever else stack
garbage happened to be in the flags at this point).

No idea what functional changes this will result in...

Cc: Somalapuram Amaranath <Amaranath.Somalapuram at amd.com>
Cc: Christian König <christian.koenig at amd.com>
Cc: Zack Rusin <zack.rusin at broadcom.com>
Cc: Thomas Zimmermann <tzimmermann at suse.de>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Fixes: a78a8da51b36 ("drm/ttm: replace busy placement with flags v6")
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 27dcfd8a34bb..e6f177183c0f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -162,10 +162,10 @@ i915_ttm_placement_from_obj(const struct drm_i915_gem_object *obj,
 	unsigned int flags = obj->flags;
 	unsigned int i;
 
-	places[0].flags |= TTM_PL_FLAG_DESIRED;
 	i915_ttm_place_from_region(num_allowed ? obj->mm.placements[0] :
 				   obj->mm.region, &places[0], obj->bo_offset,
 				   obj->base.size, flags);
+	places[0].flags |= TTM_PL_FLAG_DESIRED;
 
 	/* Cache this on object? */
 	for (i = 0; i < num_allowed; ++i) {
-- 
2.43.0