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drm/gem: WARN if drm_gem_get_pages is called on a private obj 

No real functional change, since this just converts an annoying Oops
into a more harmless WARNING backtrace. It's still a driver bug.

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200511093554.211493-3-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2020-05-11 11:35:47 +02:00
parent 8b6b7d84bf
commit e0b3d2140e
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/drm_gem.c
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@ -548,6 +548,10 @@ static void drm_gem_check_release_pagevec(struct pagevec *pvec)
* set during initialization. If you have special zone constraints, set them * set during initialization. If you have special zone constraints, set them
* after drm_gem_object_init() via mapping_set_gfp_mask(). shmem-core takes care * after drm_gem_object_init() via mapping_set_gfp_mask(). shmem-core takes care
* to keep pages in the required zone during swap-in. * to keep pages in the required zone during swap-in.
*
* This function is only valid on objects initialized with
* drm_gem_object_init(), but not for those initialized with
* drm_gem_private_object_init() only.
*/ */
struct page **drm_gem_get_pages(struct drm_gem_object *obj) struct page **drm_gem_get_pages(struct drm_gem_object *obj)
{ {
@ -556,6 +560,10 @@ struct page **drm_gem_get_pages(struct drm_gem_object *obj)
struct pagevec pvec; struct pagevec pvec;
int i, npages; int i, npages;
if (WARN_ON(!obj->filp))
return ERR_PTR(-EINVAL);
/* This is the shared memory object that backs the GEM resource */ /* This is the shared memory object that backs the GEM resource */
mapping = obj->filp->f_mapping; mapping = obj->filp->f_mapping;