From e0b3d2140ec6f04335eb20f4651ca2b705084268 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Mon, 11 May 2020 11:35:47 +0200 Subject: [PATCH] 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 Tested-by: Boris Brezillon Signed-off-by: Daniel Vetter Link: https://patchwork.freedesktop.org/patch/msgid/20200511093554.211493-3-daniel.vetter@ffwll.ch --- drivers/gpu/drm/drm_gem.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index efc0367..94dd942 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -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 * after drm_gem_object_init() via mapping_set_gfp_mask(). shmem-core takes care * 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) { @@ -556,6 +560,10 @@ struct page **drm_gem_get_pages(struct drm_gem_object *obj) struct pagevec pvec; int i, npages; + + if (WARN_ON(!obj->filp)) + return ERR_PTR(-EINVAL); + /* This is the shared memory object that backs the GEM resource */ mapping = obj->filp->f_mapping; -- 2.7.4