[PATCH 3/4] drm/tegra: gr3d: Properly clean up resources

[Dmitry Osipenko]

On 04.05.2018 16:37, Thierry Reding wrote:
> From: Thierry Reding <treding at nvidia.com>
> 
> Failure to register the Tegra DRM client would leak the resources. Move
> cleanup code to error unwinding gotos to fix that and share the cleanup
> code with the other error paths.
> 
> Signed-off-by: Thierry Reding <treding at nvidia.com>
> ---
>  drivers/gpu/drm/tegra/gr3d.c | 27 +++++++++++++++++++++------
>  1 file changed, 21 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tegra/gr3d.c b/drivers/gpu/drm/tegra/gr3d.c
> index ce5120683091..e129f1afff33 100644
> --- a/drivers/gpu/drm/tegra/gr3d.c
> +++ b/drivers/gpu/drm/tegra/gr3d.c
> @@ -52,8 +52,8 @@ static int gr3d_init(struct host1x_client *client)
>  
>  	client->syncpts[0] = host1x_syncpt_request(client, flags);
>  	if (!client->syncpts[0]) {
> -		host1x_channel_put(gr3d->channel);
> -		return -ENOMEM;
> +		err = -ENOMEM;
> +		goto put;
>  	}
>  
>  	if (tegra->domain) {
> @@ -65,15 +65,30 @@ static int gr3d_init(struct host1x_client *client)
>  				dev_err(client->dev,
>  					"failed to attach to domain: %d\n",
>  					err);
> -				host1x_syncpt_free(client->syncpts[0]);
> -				host1x_channel_put(gr3d->channel);
>  				iommu_group_put(gr3d->group);
> -				return err;
> +				goto free;
>  			}
>  		}
>  	}
>  
> -	return tegra_drm_register_client(dev->dev_private, drm);
> +	err = tegra_drm_register_client(dev->dev_private, drm);
> +	if (err < 0) {
> +		dev_err(client->dev, "failed to register client: %d\n", err);
> +		goto detach;
> +	}
> +
> +	return 0;
> +
> +detach:
> +	if (gr3d->group) {
> +		iommu_detach_group(tegra->domain, gr3d->group);
> +		iommu_group_put(gr3d->group);
> +	}
> +free:
> +	host1x_syncpt_free(client->syncpts[0]);
> +put:
> +	host1x_channel_put(gr3d->channel);
> +	return err;
>  }
>  
>  static int gr3d_exit(struct host1x_client *client)
> 

Reviewed-by: Dmitry Osipenko <digetx at gmail.com>