drm/nouveau: platform: Fix deferred probe

From: Thierry Reding <treding@nvidia.com>

The error cleanup paths aren't quite correct and will crash upon
deferred probe.

Cc: stable@vger.kernel.org # v4.3+
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 drivers/gpu/drm/nouveau/nouveau_platform.c         |  2 +-
 drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c | 40 ++++++++++++++++------
 2 files changed, 30 insertions(+), 12 deletions(-)

On 02/25/2016 03:34 AM, Thierry Reding wrote:
> From: Thierry Reding <treding@nvidia.com>
> 
> The error cleanup paths aren't quite correct and will crash upon
> deferred probe.
> 
> Cc: stable@vger.kernel.org # v4.3+
> Signed-off-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>

> ---
>  drivers/gpu/drm/nouveau/nouveau_platform.c         |  2 +-
>  drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c | 40 ++++++++++++++++------
>  2 files changed, 30 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nouveau_platform.c b/drivers/gpu/drm/nouveau/nouveau_platform.c
> index 8a70cec59bcd..2dfe58af12e4 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_platform.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_platform.c
> @@ -24,7 +24,7 @@
>  static int nouveau_platform_probe(struct platform_device *pdev)
>  {
>  	const struct nvkm_device_tegra_func *func;
> -	struct nvkm_device *device;
> +	struct nvkm_device *device = NULL;
>  	struct drm_device *drm;
>  	int ret;
>  
> diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
> index 7f8a42721eb2..e7e581d6a8ff 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
> @@ -252,32 +252,40 @@ nvkm_device_tegra_new(const struct nvkm_device_tegra_func *func,
>  
>  	if (!(tdev = kzalloc(sizeof(*tdev), GFP_KERNEL)))
>  		return -ENOMEM;
> -	*pdevice = &tdev->device;
> +
>  	tdev->func = func;
>  	tdev->pdev = pdev;
>  	tdev->irq = -1;
>  
>  	tdev->vdd = devm_regulator_get(&pdev->dev, "vdd");
> -	if (IS_ERR(tdev->vdd))
> -		return PTR_ERR(tdev->vdd);
> +	if (IS_ERR(tdev->vdd)) {
> +		ret = PTR_ERR(tdev->vdd);
> +		goto free;
> +	}
>  
>  	tdev->rst = devm_reset_control_get(&pdev->dev, "gpu");
> -	if (IS_ERR(tdev->rst))
> -		return PTR_ERR(tdev->rst);
> +	if (IS_ERR(tdev->rst)) {
> +		ret = PTR_ERR(tdev->rst);
> +		goto free;
> +	}
>  
>  	tdev->clk = devm_clk_get(&pdev->dev, "gpu");
> -	if (IS_ERR(tdev->clk))
> -		return PTR_ERR(tdev->clk);
> +	if (IS_ERR(tdev->clk)) {
> +		ret = PTR_ERR(tdev->clk);
> +		goto free;
> +	}
>  
>  	tdev->clk_pwr = devm_clk_get(&pdev->dev, "pwr");
> -	if (IS_ERR(tdev->clk_pwr))
> -		return PTR_ERR(tdev->clk_pwr);
> +	if (IS_ERR(tdev->clk_pwr)) {
> +		ret = PTR_ERR(tdev->clk_pwr);
> +		goto free;
> +	}
>  
>  	nvkm_device_tegra_probe_iommu(tdev);
>  
>  	ret = nvkm_device_tegra_power_up(tdev);
>  	if (ret)
> -		return ret;
> +		goto remove;
>  
>  	tdev->gpu_speedo = tegra_sku_info.gpu_speedo_value;
>  	ret = nvkm_device_ctor(&nvkm_device_tegra_func, NULL, &pdev->dev,
> @@ -285,9 +293,19 @@ nvkm_device_tegra_new(const struct nvkm_device_tegra_func *func,
>  			       cfg, dbg, detect, mmio, subdev_mask,
>  			       &tdev->device);
>  	if (ret)
> -		return ret;
> +		goto powerdown;
> +
> +	*pdevice = &tdev->device;
>  
>  	return 0;
> +
> +powerdown:
> +	nvkm_device_tegra_power_down(tdev);
> +remove:
> +	nvkm_device_tegra_remove_iommu(tdev);
> +free:
> +	kfree(tdev);
> +	return ret;
>  }
>  #else
>  int
>

On Thu, Feb 25, 2016 at 2:34 AM, Thierry Reding
<thierry.reding@gmail.com> wrote:
> From: Thierry Reding <treding@nvidia.com>
>
> The error cleanup paths aren't quite correct and will crash upon
> deferred probe.
>
> Cc: stable@vger.kernel.org # v4.3+
> Signed-off-by: Thierry Reding <treding@nvidia.com>

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
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