linux-kernel - Re: [PATCH v2, 4/6] media: mediatek: vcodec: Remove encoder driver get IRQ resource

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Message-ID: <CAGXv+5Eqcv-K1O-5foTcHYXKh+0yipo-i+EjgYOMemS3_82fAQ@mail.gmail.com>
Date:   Fri, 26 Aug 2022 12:08:49 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Irui Wang <irui.wang@...iatek.com>
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        angelogioacchino.delregno@...labora.com,
        Maoguang Meng <maoguang.meng@...iatek.com>,
        Longfei Wang <longfei.wang@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        srv_heupstream@...iatek.com, linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2, 4/6] media: mediatek: vcodec: Remove encoder driver
 get IRQ resource

Hi,

On Wed, Jul 20, 2022 at 4:58 PM Irui Wang <irui.wang@...iatek.com> wrote:
>
> The "platform_get_resource(pdev, IORESOURCE_IRQ, 0)" is no longer
> used after commit a1a2b7125e107("of/platform: Drop static setup of
> IRQ resource from DT core"), so just remove the function in
> encoder driver to avoid driver probe failed.
>
> Signed-off-by: Irui Wang <irui.wang@...iatek.com>
> ---
>  .../media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c   | 8 --------
>  1 file changed, 8 deletions(-)
>
> diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
> index ea667b867b56..6d8964fb4fa2 100644
> --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
> +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
> @@ -228,7 +228,6 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>  {
>         struct mtk_vcodec_dev *dev;
>         struct video_device *vfd_enc;
> -       struct resource *res;
>         phandle rproc_phandle;
>         enum mtk_vcodec_fw_type fw_type;
>         int ret;
> @@ -272,13 +271,6 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
>                 goto err_res;
>         }
>
> -       res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> -       if (res == NULL) {
> -               dev_err(&pdev->dev, "failed to get irq resource");
> -               ret = -ENOENT;
> -               goto err_res;
> -       }
> -
>         dev->enc_irq = platform_get_irq(pdev, 0);

platform_get_irq() returns a negative number on failure. You should
check for errors here as the previous check was removed.

The description of platform_get_irq() explicitly mentions:

    Device drivers should check the return value for errors so as to
    not pass a negative integer value to the request_irq() APIs.

Hans has queued up this patch, so maybe you could provide a follow-up
patch to fix this?


Regards
ChenYu


>         irq_set_status_flags(dev->enc_irq, IRQ_NOAUTOEN);
>         ret = devm_request_irq(&pdev->dev, dev->enc_irq,
> --
> 2.18.0
>