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drm/i915: Protect private gem objects from truncate (such as imported dmabuf)

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If the object has no backing shmemfs filp, then we obviously cannot
perform a truncation operation upon it.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-08-11 15:41:05 +01:00 committed by Daniel Vetter
parent 86a1ee26bb
commit 4d6294bf77
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/i915/i915_gem.c
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@ -1385,6 +1385,11 @@ i915_gem_object_truncate(struct drm_i915_gem_object *obj)
{
struct inode *inode;
i915_gem_object_free_mmap_offset(obj);
if (obj->base.filp == NULL)
return;
/* Our goal here is to return as much of the memory as
* is possible back to the system as we are called from OOM.
* To do this we must instruct the shmfs to drop all of its
@ -1393,8 +1398,6 @@ i915_gem_object_truncate(struct drm_i915_gem_object *obj)
inode = obj->base.filp->f_path.dentry->d_inode;
shmem_truncate_range(inode, 0, (loff_t)-1);
i915_gem_object_free_mmap_offset(obj);
obj->madv = __I915_MADV_PURGED;
}