linux-kernel - [PATCH v19 26/30] drm/shmem-helper: Turn warnings about imported GEM into errors

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Date: Fri,  5 Jan 2024 21:46:20 +0300
From: Dmitry Osipenko <dmitry.osipenko@...labora.com>
To: David Airlie <airlied@...il.com>,
	Gerd Hoffmann <kraxel@...hat.com>,
	Gurchetan Singh <gurchetansingh@...omium.org>,
	Chia-I Wu <olvaffe@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Christian König <christian.koenig@....com>,
	Qiang Yu <yuq825@...il.com>,
	Steven Price <steven.price@....com>,
	Boris Brezillon <boris.brezillon@...labora.com>,
	Emma Anholt <emma@...olt.net>,
	Melissa Wen <mwen@...lia.com>
Cc: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	kernel@...labora.com,
	virtualization@...ts.linux-foundation.org
Subject: [PATCH v19 26/30] drm/shmem-helper: Turn warnings about imported GEM into errors

Turn sanity warnings about DRM-SHMEM API misuse into a error conditions
for cases where imported GEM is used when it shouldn't be used.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 0d95d723b90d..7d2fe12bd793 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -409,7 +409,8 @@ int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem)
 	struct drm_gem_object *obj = &shmem->base;
 	int ret;
 
-	drm_WARN_ON(obj->dev, obj->import_attach);
+	if (drm_WARN_ON(obj->dev, obj->import_attach))
+		return -EINVAL;
 
 	if (refcount_inc_not_zero(&shmem->pages_pin_count))
 		return 0;
@@ -872,7 +873,8 @@ struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_shmem_object *shmem)
 {
 	struct drm_gem_object *obj = &shmem->base;
 
-	drm_WARN_ON(obj->dev, obj->import_attach);
+	if (drm_WARN_ON(obj->dev, obj->import_attach))
+		return ERR_PTR(-EINVAL);
 
 	if (drm_WARN_ON(obj->dev, !shmem->pages))
 		return ERR_PTR(-ENOMEM);
@@ -909,7 +911,8 @@ struct sg_table *drm_gem_shmem_get_pages_sgt_locked(struct drm_gem_shmem_object
 	if (shmem->sgt)
 		return shmem->sgt;
 
-	drm_WARN_ON(obj->dev, obj->import_attach);
+	if (drm_WARN_ON(obj->dev, obj->import_attach))
+		return ERR_PTR(-EINVAL);
 
 	sgt = drm_gem_shmem_get_sg_table(shmem);
 	if (IS_ERR(sgt))
-- 
2.43.0