linux-kernel - Re: [PATCH v2] media: camss: vfe: Don't call hw_version() before its dependencies are met

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Date:   Thu, 12 Aug 2021 12:16:41 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Robert Foss <robert.foss@...aro.org>, todor.too@...il.com,
        agross@...nel.org, bjorn.andersson@...aro.org, mchehab@...nel.org,
        hverkuil-cisco@...all.nl, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Linux Kernel Functional Testing <lkft@...aro.org>
Subject: Re: [PATCH v2] media: camss: vfe: Don't call hw_version() before
 its dependencies are met

On 12.08.2021 11:21, Robert Foss wrote:
> vfe->ops->hw_version(vfe) is being called before vfe->base has been
> assigned, and before the hardware has been powered up.
>
> Fixes: b10b5334528a9 ("media: camss: vfe: Don't read hardware version needlessly")
>
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Signed-off-by: Robert Foss <robert.foss@...aro.org>
Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>   drivers/media/platform/qcom/camss/camss-vfe.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
> index 6b2f33fc9be2..71f78b40e7f5 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe.c
> @@ -604,6 +604,8 @@ static int vfe_get(struct vfe_device *vfe)
>   		vfe_reset_output_maps(vfe);
>   
>   		vfe_init_outputs(vfe);
> +
> +		vfe->ops->hw_version(vfe);
>   	} else {
>   		ret = vfe_check_clock_rates(vfe);
>   		if (ret < 0)
> @@ -1299,7 +1301,6 @@ int msm_vfe_subdev_init(struct camss *camss, struct vfe_device *vfe,
>   		return -EINVAL;
>   	}
>   	vfe->ops->subdev_init(dev, vfe);
> -	vfe->ops->hw_version(vfe);
>   
>   	/* Memory */
>   

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland