linux-kernel - Re: [PATCH] soc: qcom: apr: Add check for idr

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Date:   Mon, 12 Sep 2022 20:51:46 -0700
From:   Jeff Johnson <quic_jjohnson@...cinc.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>, <agross@...nel.org>,
        <bjorn.andersson@...aro.org>, <konrad.dybcio@...ainline.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] soc: qcom: apr: Add check for idr_alloc

On 9/12/2022 7:30 PM, Jiasheng Jiang wrote:
> As idr_alloc() can return negative numbers,
> it should be better to check the return value and
> deal with the exception.
> 
> Fixes: 6adba21eb434 ("soc: qcom: Add APR bus driver")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>   drivers/soc/qcom/apr.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/qcom/apr.c b/drivers/soc/qcom/apr.c
> index b4046f393575..1b73ce9b4f9a 100644
> --- a/drivers/soc/qcom/apr.c
> +++ b/drivers/soc/qcom/apr.c
> @@ -454,8 +454,12 @@ static int apr_add_device(struct device *dev, struct device_node *np,
>   	adev->dev.driver = NULL;
>   
>   	spin_lock(&apr->svcs_lock);
> -	idr_alloc(&apr->svcs_idr, svc, svc_id, svc_id + 1, GFP_ATOMIC);
> +	ret = idr_alloc(&apr->svcs_idr, svc, svc_id, svc_id + 1, GFP_ATOMIC);
>   	spin_unlock(&apr->svcs_lock);
> +	if (ret < 0) {
> +		kfree(adev);
> +		return ret;
> +	}

for consistency suggest you follow the same error logic as the 
device_register() failure just below, call dev_err() and put_device()