linux-kernel - Re: [PATCH] soundwire: qcom: Use guard to avoid mixing cleanup and goto

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Message-ID: <fba86e25-3327-4fbf-86f1-485bbaeec32d@oss.qualcomm.com>
Date: Mon, 1 Dec 2025 11:04:49 +0000
From: Srinivas Kandagatla <srinivas.kandagatla@....qualcomm.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>,
        Srinivas Kandagatla <srini@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.dev>,
        linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soundwire: qcom: Use guard to avoid mixing cleanup and
 goto



On 12/1/25 10:26 AM, Krzysztof Kozlowski wrote:
> qcom_swrm_stream_alloc_ports() already uses cleanup.h but also has goto.
> Such combination is error-prone and discouraged:
> 
> "... and that the "goto" statement can jump between scopes, the
> expectation is that usage of "goto" and cleanup helpers is never mixed
> in the same function."
> 
> Actually simplify the code with a guard which allows to fix the
> discouraged style by removing the goto.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
> ---

Thanks for the patch,
LGTM,

Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@....qualcomm.com>


--srini>  drivers/soundwire/qcom.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
> index 17afc5aa8b44..8102a1b0d516 100644
> --- a/drivers/soundwire/qcom.c
> +++ b/drivers/soundwire/qcom.c
> @@ -1228,7 +1228,7 @@ static int qcom_swrm_stream_alloc_ports(struct qcom_swrm_ctrl *ctrl,
>  	struct sdw_port_runtime *p_rt;
>  	struct sdw_slave *slave;
>  	unsigned long *port_mask;
> -	int maxport, pn, nports = 0, ret = 0;
> +	int maxport, pn, nports = 0;
>  	unsigned int m_port;
>  	struct sdw_port_config *pconfig __free(kfree) = kcalloc(ctrl->nports,
>  								sizeof(*pconfig), GFP_KERNEL);
> @@ -1246,7 +1246,8 @@ static int qcom_swrm_stream_alloc_ports(struct qcom_swrm_ctrl *ctrl,
>  	sconfig.type = stream->type;
>  	sconfig.bps = 1;
>  
> -	mutex_lock(&ctrl->port_lock);
> +	guard(mutex)(&ctrl->port_lock);
> +
>  	list_for_each_entry(m_rt, &stream->master_list, stream_node) {
>  		/*
>  		 * For streams with multiple masters:
> @@ -1272,8 +1273,7 @@ static int qcom_swrm_stream_alloc_ports(struct qcom_swrm_ctrl *ctrl,
>  
>  				if (pn > maxport) {
>  					dev_err(ctrl->dev, "All ports busy\n");
> -					ret = -EBUSY;
> -					goto out;
> +					return -EBUSY;
>  				}
>  				set_bit(pn, port_mask);
>  				pconfig[nports].num = pn;
> @@ -1285,10 +1285,8 @@ static int qcom_swrm_stream_alloc_ports(struct qcom_swrm_ctrl *ctrl,
>  
>  	sdw_stream_add_master(&ctrl->bus, &sconfig, pconfig,
>  			      nports, stream);
> -out:
> -	mutex_unlock(&ctrl->port_lock);
>  
> -	return ret;
> +	return 0;
>  }
>  
>  static int qcom_swrm_hw_params(struct snd_pcm_substream *substream,