linux-kernel - Re: [PATCH] soc: qcom: ocmem: Fix missing put_device() call in of_get

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Message-ID: <YfhfT0EC393GxSRd@builder.lan>
Date:   Mon, 31 Jan 2022 16:14:39 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Andy Gross <agross@...nel.org>, Luca Weiss <luca@...tu.xyz>,
        Brian Masney <masneyb@...tation.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: qcom: ocmem: Fix missing put_device() call in
 of_get_ocmem

On Fri 07 Jan 01:31 CST 2022, Miaoqian Lin wrote:

> The reference taken by 'of_find_device_by_node()' must be released when
> not needed anymore.
> Add the corresponding 'put_device()' in the error handling path.
> 
> Fixes: 01f937ffc468 ("soc: qcom: ocmem: don't return NULL in of_get_ocmem")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>

Your patch solves the particular problem, so I'm applying it.

But it seems that we never release pdev in the case of successfully
return the ocmem object either... So there's more to improve here.

Regards,
Bjorn

> ---
>  drivers/soc/qcom/ocmem.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/soc/qcom/ocmem.c b/drivers/soc/qcom/ocmem.c
> index d2dacbbaafbd..97fd24c178f8 100644
> --- a/drivers/soc/qcom/ocmem.c
> +++ b/drivers/soc/qcom/ocmem.c
> @@ -206,6 +206,7 @@ struct ocmem *of_get_ocmem(struct device *dev)
>  	ocmem = platform_get_drvdata(pdev);
>  	if (!ocmem) {
>  		dev_err(dev, "Cannot get ocmem\n");
> +		put_device(&pdev->dev);
>  		return ERR_PTR(-ENODEV);
>  	}
>  	return ocmem;
> -- 
> 2.17.1
>