netdev - Re: [PATCH 3/4] soc: qcom: aoss: Format string in qmp

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Date: Mon, 31 Jul 2023 10:20:54 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Bjorn Andersson <quic_bjorande@...cinc.com>,
 Bjorn Andersson <andersson@...nel.org>, Chris Lew <quic_clew@...cinc.com>
Cc: Alex Elder <elder@...nel.org>, "David S. Miller" <davem@...emloft.net>,
 Jakub Kicinski <kuba@...nel.org>,
 Mathieu Poirier <mathieu.poirier@...aro.org>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH 3/4] soc: qcom: aoss: Format string in qmp_send()

On 31.07.2023 06:10, Bjorn Andersson wrote:
> The majority of callers to qmp_send() composes the message dynamically
> using some form of sprintf(), resulting in unnecessary complication and
> stack usage.
> 
> By changing the interface of qmp_send() to take a format string and
> arguments, the duplicated composition of the commands can be moved to a
> single location.
> 
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
[...]

> +int qmp_send(struct qmp *qmp, const char *fmt, ...)
>  {
>  	long time_left;
> +	va_list args;
>  	char buf[QMP_MSG_LEN];
> +	int len;
>  	int ret;
>  
> -	if (WARN_ON(IS_ERR_OR_NULL(qmp) || !data))
> +	if (WARN_ON(IS_ERR_OR_NULL(qmp) || !fmt))
>  		return -EINVAL;
>  
> -	if (WARN_ON(strlen(data) >= sizeof(buf)))
> -		return -EINVAL;
> +	memset(buf, 0, sizeof(buf));
Wouldn't initializing the array with = { 0 } be faster?

Otherwise, this looks very cool

Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Konrad