Re: [PATCH v3 2/2] drm/gem-shmem: Add import attachment warning to locked pin function

[Boris Brezillon]

On Wed,  1 May 2024 07:56:00 +0100
Adrián Larumbe <adrian.larumbe@xxxxxxxxxxxxx> wrote:

> Commit ec144244a43f ("drm/gem-shmem: Acquire reservation lock in GEM
> pin/unpin callbacks") moved locking DRM object's dma reservation to
> drm_gem_shmem_object_pin, and made drm_gem_shmem_pin_locked public, so we
> need to make sure the non-NULL check warning is also added to the latter.
> 
> Signed-off-by: Adrián Larumbe <adrian.larumbe@xxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/drm_gem_shmem_helper.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index 177773bcdbfd..ad5d9f704e15 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -233,6 +233,8 @@ int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem)
>  
>  	dma_resv_assert_held(shmem->base.resv);
>  
> +	drm_WARN_ON(shmem->base.dev, shmem->base.import_attach);

If we add a WARN_ON() here, we can probably drop the one in
drm_gem_shmem_pin(), and do the same for drm_gem_shmem_unpin[_locked]()
to keep things consistent.

> +
>  	ret = drm_gem_shmem_get_pages(shmem);
>  
>  	return ret;