From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
VMA creation and GEM list management need the big lock.
v2:
Mutex unlock ended on the wrong path somehow. (0-day, Julia Lawall)
Not to mention drm_gem_object_unreference was there in existing
code with no mutex held.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_stolen.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index c384dc9c8a63..7c2f9127bb23 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -670,6 +670,8 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
if (gtt_offset == I915_GTT_OFFSET_NONE)
return obj;
+ mutex_lock(&dev->struct_mutex);
+
vma = i915_gem_obj_lookup_or_create_vma(obj, ggtt);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
@@ -698,9 +700,12 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
i915_gem_object_pin_pages(obj);
+ mutex_unlock(&dev->struct_mutex);
+
return obj;
err:
drm_gem_object_unreference(&obj->base);
+ mutex_unlock(&dev->struct_mutex);
return NULL;
}
--
1.9.1
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