linux-kernel - Re: [PATCH 1/2] soc: qcom: rmtfs: fix error handling reading qcom,vmid

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Message-ID: <44a6fbdf-a2bc-2cb7-08e6-fb75e5fd97eb@linaro.org>
Date:   Mon, 6 Mar 2023 11:16:09 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Luca Weiss <luca@...tu.xyz>, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Loic Poulain <loic.poulain@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] soc: qcom: rmtfs: fix error handling reading
 qcom,vmid



On 5.03.2023 11:32, Luca Weiss wrote:
> of_property_count_u32_elems returns a negative integer when an error
> happens , but since the value was assigned to an unsigned integer, the
> check never worked correctly. Also print the correct variable in the
> error print, ret isn't used here.
> 
> Fixes: e656cd0bcf3d ("soc: qcom: rmtfs: Optionally map RMTFS to more VMs")
> Signed-off-by: Luca Weiss <luca@...tu.xyz>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad
>  drivers/soc/qcom/rmtfs_mem.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/qcom/rmtfs_mem.c b/drivers/soc/qcom/rmtfs_mem.c
> index 9d59ad509a5c7..218397ab0c36f 100644
> --- a/drivers/soc/qcom/rmtfs_mem.c
> +++ b/drivers/soc/qcom/rmtfs_mem.c
> @@ -176,7 +176,8 @@ static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
>  	struct reserved_mem *rmem;
>  	struct qcom_rmtfs_mem *rmtfs_mem;
>  	u32 client_id;
> -	u32 num_vmids, vmid[NUM_MAX_VMIDS];
> +	u32 vmid[NUM_MAX_VMIDS];
> +	int num_vmids;
>  	int ret, i;
>  
>  	rmem = of_reserved_mem_lookup(node);
> @@ -229,7 +230,7 @@ static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
>  
>  	num_vmids = of_property_count_u32_elems(node, "qcom,vmid");
>  	if (num_vmids < 0) {
> -		dev_err(&pdev->dev, "failed to count qcom,vmid elements: %d\n", ret);
> +		dev_err(&pdev->dev, "failed to count qcom,vmid elements: %d\n", num_vmids);
>  		goto remove_cdev;
>  	} else if (num_vmids > NUM_MAX_VMIDS) {
>  		dev_warn(&pdev->dev,
>