linux-kernel - Re: [PATCH] drm/nouveau/tegra: remove needless NULL check

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Date:   Mon, 23 May 2022 16:11:07 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     Guo Zhengkui <guozhengkui@...o.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Karol Herbst <kherbst@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...pe.ca>, Joerg Roedel <jroedel@...e.de>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <dri-devel@...ts.freedesktop.org>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <nouveau@...ts.freedesktop.org>,
        "open list:TEGRA ARCHITECTURE SUPPORT" <linux-tegra@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Cc:     zhengkui_guo@...look.com
Subject: Re: [PATCH] drm/nouveau/tegra: remove needless NULL check

Reviewed-by: Lyude Paul <lyude@...hat.com>

Will push to the appropriate branch in a moment

On Thu, 2022-05-19 at 15:29 +0800, Guo Zhengkui wrote:
> There has already been NULL check in clk_prepare_enable() and
> clk_disable_unprepare(), so remove needless NULL check before
> calling them.
> 
> Signed-off-by: Guo Zhengkui <guozhengkui@...o.com>
> ---
>  drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c | 14 +++++---------
>  1 file changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
> b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
> index 2ed528c065fa..ac9e122586bc 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/tegra.c
> @@ -41,11 +41,9 @@ nvkm_device_tegra_power_up(struct nvkm_device_tegra
> *tdev)
>         ret = clk_prepare_enable(tdev->clk);
>         if (ret)
>                 goto err_clk;
> -       if (tdev->clk_ref) {
> -               ret = clk_prepare_enable(tdev->clk_ref);
> -               if (ret)
> -                       goto err_clk_ref;
> -       }
> +       ret = clk_prepare_enable(tdev->clk_ref);
> +       if (ret)
> +               goto err_clk_ref;
>         ret = clk_prepare_enable(tdev->clk_pwr);
>         if (ret)
>                 goto err_clk_pwr;
> @@ -70,8 +68,7 @@ nvkm_device_tegra_power_up(struct nvkm_device_tegra *tdev)
>  err_clamp:
>         clk_disable_unprepare(tdev->clk_pwr);
>  err_clk_pwr:
> -       if (tdev->clk_ref)
> -               clk_disable_unprepare(tdev->clk_ref);
> +       clk_disable_unprepare(tdev->clk_ref);
>  err_clk_ref:
>         clk_disable_unprepare(tdev->clk);
>  err_clk:
> @@ -87,8 +84,7 @@ nvkm_device_tegra_power_down(struct nvkm_device_tegra
> *tdev)
>         int ret;
>  
>         clk_disable_unprepare(tdev->clk_pwr);
> -       if (tdev->clk_ref)
> -               clk_disable_unprepare(tdev->clk_ref);
> +       clk_disable_unprepare(tdev->clk_ref);
>         clk_disable_unprepare(tdev->clk);
>         udelay(10);
>  

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat