linux-kernel - Re: [PATCH v2] soc: qcom: smsm: Improve error handling, quiesce probe deferral

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Message-ID: <20170405170123.GK70446@Bjorns-MacBook-Pro-2.local>
Date:   Wed, 5 Apr 2017 10:01:23 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Jonathan Neusch?fer <j.neuschaefer@....net>
Cc:     linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] soc: qcom: smsm: Improve error handling, quiesce
 probe deferral

On Wed 05 Apr 05:10 PDT 2017, Jonathan Neusch?fer wrote:

> Don't use size if info indicates an error condition. Previously a
> non-ENOENT error (such as -EPROBE_DEFER) would lead to size being used
> even though it hadn't necessarily been initialized in qcom_smem_get.
> 
> Don't print an error message in the -EPROBE_DEFER case.
> 
> Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> 
> ---
> v2:
> - Rewrite based on Bjorn's suggestion.
> - Don't check for -EPROBE_DEFER again after qcom_smem_alloc was called
>   in qcom_smsm_probe. This point is only reached if smsm_get_size_info
>   returned success, which can only happen if probe deferral is over.
> v1:
> - was "[PATCH 1/2] soc: qcom: smsm: Handle probe deferral"
> ---
>  drivers/soc/qcom/smsm.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/soc/qcom/smsm.c b/drivers/soc/qcom/smsm.c
> index d0337b2a71c8..dc540ea92e9d 100644
> --- a/drivers/soc/qcom/smsm.c
> +++ b/drivers/soc/qcom/smsm.c
> @@ -439,14 +439,15 @@ static int smsm_get_size_info(struct qcom_smsm *smsm)
>  	} *info;
>  
>  	info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_SMSM_SIZE_INFO, &size);
> -	if (PTR_ERR(info) == -ENOENT || size != sizeof(*info)) {
> +	if (IS_ERR(info) && PTR_ERR(info) != -ENOENT) {
> +		if (PTR_ERR(info) != -EPROBE_DEFER)
> +			dev_err(smsm->dev, "unable to retrieve smsm size info\n");
> +		return PTR_ERR(info);
> +	} else if (IS_ERR(info) || size != sizeof(*info)) {
>  		dev_warn(smsm->dev, "no smsm size info, using defaults\n");
>  		smsm->num_entries = SMSM_DEFAULT_NUM_ENTRIES;
>  		smsm->num_hosts = SMSM_DEFAULT_NUM_HOSTS;
>  		return 0;
> -	} else if (IS_ERR(info)) {
> -		dev_err(smsm->dev, "unable to retrieve smsm size info\n");
> -		return PTR_ERR(info);
>  	}
>  
>  	smsm->num_entries = info->num_entries;
> -- 
> 2.11.0
>