linux-kernel - Re: [PATCH v3] firmware: qcom: scm: Fix incorrect of_node_put calls in scm

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Message-ID: <a39633d8-fa2a-1184-9a4d-4545eae34dd4@baylibre.com>
Date:   Mon, 15 Jan 2018 14:25:16 +0100
From:   Loys Ollivier <lollivier@...libre.com>
To:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>
Cc:     linux-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org,
        Jerome Brunet <jbrunet@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v3] firmware: qcom: scm: Fix incorrect of_node_put calls
 in scm_init


Hello guys,

Any news on this fix ? Anything else you need on my side ?

Thanks

On 15/12/2017 14:40, Loys Ollivier wrote:
> When using other platform architectures, in the init of the qcom_scm
> driver, of_node_put is called on /firmware if no qcom dt is found.
> This results in a kernel error: Bad of_node_put() on /firmware.
> 
> These calls to of_node_put from the qcom_scm init are unnecessary as
> of_find_matching_node and of_platform_populate are calling it
> automatically.
> 
> Remove the calls to of_node_put() on fw_np.
> 
> Fixes: d0f6fa7ba2d6 ("firmware: qcom: scm: Convert SCM to platform driver")
> Suggested-by: Stephen Boyd <sboyd@...eaurora.org>
> Signed-off-by: Loys Ollivier <lollivier@...libre.com>
> ---
>  drivers/firmware/qcom_scm.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index af4c75217ea6..f6d7b7cffe0c 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -632,17 +632,13 @@ static int __init qcom_scm_init(void)
>  
>  	np = of_find_matching_node(fw_np, qcom_scm_dt_match);
>  
> -	if (!np) {
> -		of_node_put(fw_np);
> +	if (!np)
>  		return -ENODEV;
> -	}
>  
>  	of_node_put(np);
>  
>  	ret = of_platform_populate(fw_np, qcom_scm_dt_match, NULL, NULL);
>  
> -	of_node_put(fw_np);
> -
>  	if (ret)
>  		return ret;
>  
>