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Commit 4d6294bf authored by Chris Wilson's avatar Chris Wilson Committed by Daniel Vetter
Browse files

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



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

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 86a1ee26

drivers/gpu/drm/i915/i915_gem.c

+5 −2
Original line number Diff line number Diff line
@@ -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;

}