Re: [PATCH 2/2] drm: Don't swallow error codes in drm_dev_alloc()

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Hey

On Wed, Sep 21, 2016 at 4:59 PM, Tom Gundersen <teg@xxxxxxx> wrote:
> There are many reasons other than ENOMEM that drm_dev_init() can
> fail. Return ERR_PTR rather than NULL to be able to distinguish
> these in the caller.
>
> Signed-off-by: Tom Gundersen <teg@xxxxxxx>
> ---

Reviewed-by: David Herrmann <dh.herrmann@xxxxxxxxx>

Thanks
David

>  drivers/gpu/drm/arc/arcpgu_drv.c                | 4 ++--
>  drivers/gpu/drm/arm/hdlcd_drv.c                 | 4 ++--
>  drivers/gpu/drm/arm/malidp_drv.c                | 4 ++--
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c    | 4 ++--
>  drivers/gpu/drm/drm_drv.c                       | 6 +++---
>  drivers/gpu/drm/drm_pci.c                       | 4 ++--
>  drivers/gpu/drm/drm_platform.c                  | 4 ++--
>  drivers/gpu/drm/etnaviv/etnaviv_drv.c           | 4 ++--
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c       | 4 ++--
>  drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c | 4 ++--
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c          | 4 ++--
>  drivers/gpu/drm/msm/msm_drv.c                   | 4 ++--
>  drivers/gpu/drm/nouveau/nouveau_drm.c           | 4 ++--
>  drivers/gpu/drm/rcar-du/rcar_du_drv.c           | 4 ++--
>  drivers/gpu/drm/rockchip/rockchip_drm_drv.c     | 4 ++--
>  drivers/gpu/drm/sti/sti_drv.c                   | 4 ++--
>  drivers/gpu/drm/sun4i/sun4i_drv.c               | 4 ++--
>  drivers/gpu/drm/tegra/drm.c                     | 4 ++--
>  drivers/gpu/drm/udl/udl_drv.c                   | 4 ++--
>  drivers/gpu/drm/vc4/vc4_drv.c                   | 4 ++--
>  drivers/gpu/drm/vgem/vgem_drv.c                 | 4 ++--
>  drivers/gpu/drm/virtio/virtgpu_drm_bus.c        | 4 ++--
>  22 files changed, 45 insertions(+), 45 deletions(-)
>
> diff --git a/drivers/gpu/drm/arc/arcpgu_drv.c b/drivers/gpu/drm/arc/arcpgu_drv.c
> index 6d4ff34..28e6471 100644
> --- a/drivers/gpu/drm/arc/arcpgu_drv.c
> +++ b/drivers/gpu/drm/arc/arcpgu_drv.c
> @@ -198,8 +198,8 @@ static int arcpgu_probe(struct platform_device *pdev)
>         int ret;
>
>         drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
> -       if (!drm)
> -               return -ENOMEM;
> +       if (IS_ERR(drm))
> +               return PTR_ERR(drm);
>
>         ret = arcpgu_load(drm);
>         if (ret)
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> index d83b46a..fb6a418 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -326,8 +326,8 @@ static int hdlcd_drm_bind(struct device *dev)
>                 return -ENOMEM;
>
>         drm = drm_dev_alloc(&hdlcd_driver, dev);
> -       if (!drm)
> -               return -ENOMEM;
> +       if (IS_ERR(drm))
> +               return PTR_ERR(drm);
>
>         drm->dev_private = hdlcd;
>         dev_set_drvdata(dev, drm);
> diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> index c383d72..9280358 100644
> --- a/drivers/gpu/drm/arm/malidp_drv.c
> +++ b/drivers/gpu/drm/arm/malidp_drv.c
> @@ -311,8 +311,8 @@ static int malidp_bind(struct device *dev)
>                 return ret;
>
>         drm = drm_dev_alloc(&malidp_driver, dev);
> -       if (!drm) {
> -               ret = -ENOMEM;
> +       if (IS_ERR(drm)) {
> +               ret = PTR_ERR(drm);
>                 goto alloc_fail;
>         }
>
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> index 8e7483d..5f48431 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> @@ -797,8 +797,8 @@ static int atmel_hlcdc_dc_drm_probe(struct platform_device *pdev)
>         int ret;
>
>         ddev = drm_dev_alloc(&atmel_hlcdc_dc_driver, &pdev->dev);
> -       if (!ddev)
> -               return -ENOMEM;
> +       if (IS_ERR(ddev))
> +               return PTR_ERR(ddev);
>
>         ret = atmel_hlcdc_dc_load(ddev);
>         if (ret)
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 99e6751..80c7f25 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -591,7 +591,7 @@ EXPORT_SYMBOL(drm_dev_init);
>   * own struct should look at using drm_dev_init() instead.
>   *
>   * RETURNS:
> - * Pointer to new DRM device, or NULL if out of memory.
> + * Pointer to new DRM device, or ERR_PTR on failure.
>   */
>  struct drm_device *drm_dev_alloc(struct drm_driver *driver,
>                                  struct device *parent)
> @@ -601,12 +601,12 @@ struct drm_device *drm_dev_alloc(struct drm_driver *driver,
>
>         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
>         if (!dev)
> -               return NULL;
> +               return ERR_PTR(-ENOMEM);
>
>         ret = drm_dev_init(dev, driver, parent);
>         if (ret) {
>                 kfree(dev);
> -               return NULL;
> +               return ERR_PTR(ret);
>         }
>
>         return dev;
> diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
> index d86362f..3ceea9c 100644
> --- a/drivers/gpu/drm/drm_pci.c
> +++ b/drivers/gpu/drm/drm_pci.c
> @@ -236,8 +236,8 @@ int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
>         DRM_DEBUG("\n");
>
>         dev = drm_dev_alloc(driver, &pdev->dev);
> -       if (!dev)
> -               return -ENOMEM;
> +       if (IS_ERR(dev))
> +               return PTR_ERR(dev);
>
>         ret = pci_enable_device(pdev);
>         if (ret)
> diff --git a/drivers/gpu/drm/drm_platform.c b/drivers/gpu/drm/drm_platform.c
> index 2c819ef..0262698 100644
> --- a/drivers/gpu/drm/drm_platform.c
> +++ b/drivers/gpu/drm/drm_platform.c
> @@ -48,8 +48,8 @@ static int drm_get_platform_dev(struct platform_device *platdev,
>         DRM_DEBUG("\n");
>
>         dev = drm_dev_alloc(driver, &platdev->dev);
> -       if (!dev)
> -               return -ENOMEM;
> +       if (IS_ERR(dev))
> +               return PTR_ERR(dev);
>
>         dev->platformdev = platdev;
>
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> index e3164d9..aa68766 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
> @@ -529,8 +529,8 @@ static int etnaviv_bind(struct device *dev)
>         int ret;
>
>         drm = drm_dev_alloc(&etnaviv_drm_driver, dev);
> -       if (!drm)
> -               return -ENOMEM;
> +       if (IS_ERR(drm))
> +               return PTR_ERR(drm);
>
>         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
>         if (!priv) {
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> index 7882387..0d2ae94 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
> @@ -402,8 +402,8 @@ static int fsl_dcu_drm_probe(struct platform_device *pdev)
>         fsl_dev->tcon = fsl_tcon_init(dev);
>
>         drm = drm_dev_alloc(driver, dev);
> -       if (!drm) {
> -               ret = -ENOMEM;
> +       if (IS_ERR(drm)) {
> +               ret = PTR_ERR(drm);
>                 goto disable_pix_clk;
>         }
>
> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> index 1fc2f50..90377a6 100644
> --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
> @@ -207,8 +207,8 @@ static int kirin_drm_bind(struct device *dev)
>         int ret;
>
>         drm_dev = drm_dev_alloc(driver, dev);
> -       if (!drm_dev)
> -               return -ENOMEM;
> +       if (IS_ERR(drm_dev))
> +               return PTR_ERR(drm_dev);
>
>         drm_dev->platformdev = to_platform_device(dev);
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 72c1ae4..cf83f65 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -294,8 +294,8 @@ static int mtk_drm_bind(struct device *dev)
>         int ret;
>
>         drm = drm_dev_alloc(&mtk_drm_driver, dev);
> -       if (!drm)
> -               return -ENOMEM;
> +       if (IS_ERR(drm))
> +               return PTR_ERR(drm);
>
>         drm->dev_private = private;
>         private->drm = drm;
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 8a02370..042bde4 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -347,9 +347,9 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
>         int ret;
>
>         ddev = drm_dev_alloc(drv, dev);
> -       if (!ddev) {
> +       if (IS_ERR(ddev)) {
>                 dev_err(dev, "failed to allocate drm_device\n");
> -               return -ENOMEM;
> +               return PTR_ERR(ddev);
>         }
>
>         platform_set_drvdata(pdev, ddev);
> diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
> index 652ab11..3100fd88 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
> @@ -1067,8 +1067,8 @@ nouveau_platform_device_create(const struct nvkm_device_tegra_func *func,
>                 goto err_free;
>
>         drm = drm_dev_alloc(&driver_platform, &pdev->dev);
> -       if (!drm) {
> -               err = -ENOMEM;
> +       if (IS_ERR(drm)) {
> +               err = PTR_ERR(drm);
>                 goto err_free;
>         }
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> index 899ef7a..73c971e 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
> @@ -316,8 +316,8 @@ static int rcar_du_probe(struct platform_device *pdev)
>         rcdu->info = of_match_device(rcar_du_of_table, rcdu->dev)->data;
>
>         ddev = drm_dev_alloc(&rcar_du_driver, &pdev->dev);
> -       if (!ddev)
> -               return -ENOMEM;
> +       if (IS_ERR(ddev))
> +               return PTR_ERR(ddev);
>
>         rcdu->ddev = ddev;
>         ddev->dev_private = rcdu;
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index 76eaf1d..446b5d7 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -143,8 +143,8 @@ static int rockchip_drm_bind(struct device *dev)
>         int ret;
>
>         drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
> -       if (!drm_dev)
> -               return -ENOMEM;
> +       if (IS_ERR(drm_dev))
> +               return PTR_ERR(drm_dev);
>
>         dev_set_drvdata(dev, drm_dev);
>
> diff --git a/drivers/gpu/drm/sti/sti_drv.c b/drivers/gpu/drm/sti/sti_drv.c
> index 7cd3804..49ed3c4 100644
> --- a/drivers/gpu/drm/sti/sti_drv.c
> +++ b/drivers/gpu/drm/sti/sti_drv.c
> @@ -365,8 +365,8 @@ static int sti_bind(struct device *dev)
>         int ret;
>
>         ddev = drm_dev_alloc(&sti_driver, dev);
> -       if (!ddev)
> -               return -ENOMEM;
> +       if (IS_ERR(ddev))
> +               return PTR_ERR(ddev);
>
>         ddev->platformdev = to_platform_device(dev);
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
> index 9059e3e..0da9862 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_drv.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
> @@ -121,8 +121,8 @@ static int sun4i_drv_bind(struct device *dev)
>         int ret;
>
>         drm = drm_dev_alloc(&sun4i_drv_driver, dev);
> -       if (!drm)
> -               return -ENOMEM;
> +       if (IS_ERR(drm))
> +               return PTR_ERR(drm);
>
>         drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
>         if (!drv) {
> diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
> index 4b9f1c7..8ab47b5 100644
> --- a/drivers/gpu/drm/tegra/drm.c
> +++ b/drivers/gpu/drm/tegra/drm.c
> @@ -983,8 +983,8 @@ static int host1x_drm_probe(struct host1x_device *dev)
>         int err;
>
>         drm = drm_dev_alloc(driver, &dev->dev);
> -       if (!drm)
> -               return -ENOMEM;
> +       if (IS_ERR(drm))
> +               return PTR_ERR(drm);
>
>         dev_set_drvdata(&dev->dev, drm);
>
> diff --git a/drivers/gpu/drm/udl/udl_drv.c b/drivers/gpu/drm/udl/udl_drv.c
> index f0851db..cc45d98 100644
> --- a/drivers/gpu/drm/udl/udl_drv.c
> +++ b/drivers/gpu/drm/udl/udl_drv.c
> @@ -86,8 +86,8 @@ static int udl_usb_probe(struct usb_interface *interface,
>         int r;
>
>         dev = drm_dev_alloc(&driver, &interface->dev);
> -       if (!dev)
> -               return -ENOMEM;
> +       if (IS_ERR(dev))
> +               return PTR_ERR(dev);
>
>         r = drm_dev_register(dev, (unsigned long)udev);
>         if (r)
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
> index deec535..3c9e7f6 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.c
> +++ b/drivers/gpu/drm/vc4/vc4_drv.c
> @@ -233,8 +233,8 @@ static int vc4_drm_bind(struct device *dev)
>                 return -ENOMEM;
>
>         drm = drm_dev_alloc(&vc4_drm_driver, dev);
> -       if (!drm)
> -               return -ENOMEM;
> +       if (IS_ERR(drm))
> +               return PTR_ERR(drm);
>         platform_set_drvdata(pdev, drm);
>         vc4->dev = drm;
>         drm->dev_private = vc4;
> diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
> index c15bafb..f36c147 100644
> --- a/drivers/gpu/drm/vgem/vgem_drv.c
> +++ b/drivers/gpu/drm/vgem/vgem_drv.c
> @@ -334,8 +334,8 @@ static int __init vgem_init(void)
>         int ret;
>
>         vgem_device = drm_dev_alloc(&vgem_driver, NULL);
> -       if (!vgem_device) {
> -               ret = -ENOMEM;
> +       if (IS_ERR(vgem_device)) {
> +               ret = PTR_ERR(vgem_device);
>                 goto out;
>         }
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
> index a59d0e3..26197dd 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
> @@ -54,8 +54,8 @@ int drm_virtio_init(struct drm_driver *driver, struct virtio_device *vdev)
>         int ret;
>
>         dev = drm_dev_alloc(driver, &vdev->dev);
> -       if (!dev)
> -               return -ENOMEM;
> +       if (IS_ERR(dev))
> +               return PTR_ERR(dev);
>         dev->virtdev = vdev;
>         vdev->priv = dev;
>
> --
> 2.9.3
>
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