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drm: Return error codes from struct drm_driver.gem_create_object

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GEM helper libraries use struct drm_driver.gem_create_object to let
drivers override GEM object allocation. On failure, the call returns
NULL.

Change the semantics to make the calls return a pointer-encoded error.
This aligns the callback with its callers. Fixes the ingenic driver,
which already returns an error pointer.

Also update the callers to handle the involved types more strictly.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Steven Price <steven.price@arm.com>
Acked-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20211130095255.26710-1-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2021-11-30 10:52:55 +01:00
parent 2696f9010d
commit 4ff22f487f
9 changed files with 31 additions and 24 deletions
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2
drivers/gpu/drm/virtio/virtgpu_object.c
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@@ -139,7 +139,7 @@ struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
if (!shmem)
return NULL;
return ERR_PTR(-ENOMEM);
dshmem = &shmem->base.base;
dshmem->base.funcs = &virtio_gpu_shmem_funcs;