[PATCH v5 19/21] drm/tegra: Implement new UAPI

[Dmitry Osipenko]

11.01.2021 16:00, Mikko Perttunen пишет:
> +int tegra_drm_ioctl_channel_open(struct drm_device *drm, void *data,
> +				 struct drm_file *file)
> +{
> +	struct tegra_drm_file *fpriv = file->driver_priv;
> +	struct tegra_drm *tegra = drm->dev_private;
> +	struct drm_tegra_channel_open *args = data;
> +	struct tegra_drm_client *client = NULL;
> +	struct tegra_drm_channel_ctx *ctx;
> +	int err;
> +
> +	if (args->flags)
> +		return -EINVAL;
> +
> +	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	err = -ENODEV;
> +	list_for_each_entry(client, &tegra->clients, list) {
> +		if (client->base.class == args->host1x_class) {
> +			err = 0;
> +			break;
> +		}
> +	}
> +	if (err)
> +		goto free_ctx;
> +
> +	if (client->shared_channel) {
> +		ctx->channel = host1x_channel_get(client->shared_channel);

Let's omit the shared_channel until it will be really needed and used.