[PATCH v2] drm: Return -EOPNOTSUPP in drm_setclientcap() when driver do not support KMS

[Chris Wilson]

Quoting José Roberto de Souza (2018-09-17 22:22:44)
> All DRM_CLIENT capabilities are tied to KMS support, so returning
> -EOPNOTSUPP when KMS is not supported.
> 
> v2: returning -EOPNOTSUPP(same value as posix ENOTSUP and available
> in uapi) instead of -ENOTSUPP
> 
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/drm_ioctl.c      | 3 +++
>  drivers/gpu/drm/i915/i915_perf.c | 2 +-
>  2 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
> index 60dfbfae6a02..c0de628c194c 100644
> --- a/drivers/gpu/drm/drm_ioctl.c
> +++ b/drivers/gpu/drm/drm_ioctl.c
> @@ -306,6 +306,9 @@ drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
>  {
>         struct drm_set_client_cap *req = data;
>  

I liked Daniel's comment suggestion.

> +       if (!drm_core_check_feature(dev, DRIVER_MODESET))
> +               return -EOPNOTSUPP;
> +
>         switch (req->capability) {
>         case DRM_CLIENT_CAP_STEREO_3D:
>                 if (req->value > 1)
> diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
> index 664b96bb65a3..c1edd1e69a3e 100644
> --- a/drivers/gpu/drm/i915/i915_perf.c
> +++ b/drivers/gpu/drm/i915/i915_perf.c
> @@ -2817,7 +2817,7 @@ int i915_perf_open_ioctl(struct drm_device *dev, void *data,
>  
>         if (!dev_priv->perf.initialized) {
>                 DRM_DEBUG("i915 perf interface not available for this system\n");
> -               return -ENOTSUPP;
> +               return -EOPNOTSUPP;

Better served as a separate patch, so it can be applied to different
trees.
-Chris