linux-kernel - Re: [PATCH -next] memory: tegra186-emc: Fix error return code in tegra186_emc

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Date:   Mon, 27 Sep 2021 11:52:48 +0300
From:   Mikko Perttunen <cyndis@...si.fi>
To:     Yang Yingliang <yangyingliang@...wei.com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Cc:     krzysztof.kozlowski@...onical.com, mperttunen@...dia.com
Subject: Re: [PATCH -next] memory: tegra186-emc: Fix error return code in
 tegra186_emc_probe()

On 9/27/21 10:51 AM, Yang Yingliang wrote:
> Return the error code when command fails.
> 
> Fixes: 13324edbe926 ("memory: tegra186-emc: Handle errors in BPMP response")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>   drivers/memory/tegra/tegra186-emc.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/memory/tegra/tegra186-emc.c b/drivers/memory/tegra/tegra186-emc.c
> index abc0c2eeaab7..16351840b187 100644
> --- a/drivers/memory/tegra/tegra186-emc.c
> +++ b/drivers/memory/tegra/tegra186-emc.c
> @@ -198,6 +198,7 @@ static int tegra186_emc_probe(struct platform_device *pdev)
>   		goto put_bpmp;
>   	}
>   	if (msg.rx.ret < 0) {
> +		err = msg.rx.ret;
>   		dev_err(&pdev->dev, "EMC DVFS MRQ failed: %d (BPMP error code)\n", msg.rx.ret);
>   		goto put_bpmp;
>   	}
> 

Good catch, but we shouldn't return msg.rx.ret since it is a BPMP error 
code that doesn't necessarily map directly to a Linux error code. So we 
should set err to something like -EINVAL instead. Please update, or if 
you'd prefer, I can fix it.

Mikko