linux-kernel - Re: [PATCH -next 2/8] soc: fsl: cpm1: Simplify with dev_err

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Message-ID: <97ff8c02-1a97-7974-06fa-edb35437707d@huawei.com>
Date: Wed, 28 Aug 2024 09:58:13 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, <andrew@...n.ch>,
	<sebastian.hesselbarth@...il.com>, <gregory.clement@...tlin.com>,
	<herve.codina@...tlin.com>, <qiang.zhao@....com>,
	<christophe.leroy@...roup.eu>, <thierry.reding@...il.com>,
	<jonathanh@...dia.com>, <nm@...com>, <ssantosh@...nel.org>,
	<petlozup@...dia.com>, <pshete@...dia.com>, <christophe.jaillet@...adoo.fr>,
	<ulf.hansson@...aro.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-tegra@...r.kernel.org>, <jic23@...nel.org>
Subject: Re: [PATCH -next 2/8] soc: fsl: cpm1: Simplify with dev_err_probe()



On 2024/8/27 21:50, Krzysztof Kozlowski wrote:
> On 27/08/2024 13:46, Jinjie Ruan wrote:
>> Use the dev_err_probe() helper to simplify error handling during probe.
>> This also handle scenario, when EDEFER is returned and useless error
>> is printed.
> 
> ? Sorry, this cannot happen. Please point to below code which can defer.
> 

Thank you!

This is not referring to a specific one, but rather the benefits it
offers，simplify code is the main purpose, if necessary, it will be
removed in next version.

>>
>> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
>> ---
>>  drivers/soc/fsl/qe/tsa.c | 62 +++++++++++++++-------------------------
>>  1 file changed, 23 insertions(+), 39 deletions(-)
>>
>> diff --git a/drivers/soc/fsl/qe/tsa.c b/drivers/soc/fsl/qe/tsa.c
>> index 7fa399b7a47c..fc37d23b746d 100644
>> --- a/drivers/soc/fsl/qe/tsa.c
>> +++ b/drivers/soc/fsl/qe/tsa.c
>> @@ -453,10 +453,8 @@ static int tsa_of_parse_tdms(struct tsa *tsa, struct device_node *np)
>>  
>>  	for_each_available_child_of_node_scoped(np, tdm_np) {
>>  		ret = of_property_read_u32(tdm_np, "reg", &tdm_id);
>> -		if (ret) {
>> -			dev_err(tsa->dev, "%pOF: failed to read reg\n", tdm_np);
>> -			return ret;
>> -		}
>> +		if (ret)
>> +			return dev_err_probe(tsa->dev, ret, "%pOF: failed to read reg\n", tdm_np);
>>  		switch (tdm_id) {
>>  		case 0:
>>  			tsa->tdms |= BIT(TSA_TDMA);
>> @@ -465,18 +463,15 @@ static int tsa_of_parse_tdms(struct tsa *tsa, struct device_node *np)
>>  			tsa->tdms |= BIT(TSA_TDMB);
>>  			break;
>>  		default:
>> -			dev_err(tsa->dev, "%pOF: Invalid tdm_id (%u)\n", tdm_np,
>> -				tdm_id);
>> -			return -EINVAL;
>> +			return dev_err_probe(tsa->dev, -EINVAL, "%pOF: Invalid tdm_id (%u)\n",
>> +					     tdm_np, tdm_id);
>>  		}
>>  	}
>>  
>>  	for_each_available_child_of_node_scoped(np, tdm_np) {
>>  		ret = of_property_read_u32(tdm_np, "reg", &tdm_id);
>> -		if (ret) {
>> -			dev_err(tsa->dev, "%pOF: failed to read reg\n", tdm_np);
>> -			return ret;
>> -		}
>> +		if (ret)
>> +			return dev_err_probe(tsa->dev, ret, "%pOF: failed to read reg\n", tdm_np);
>>  
>>  		tdm = &tsa->tdm[tdm_id];
>>  		tdm->simode_tdm = TSA_SIMODE_TDM_SDM_NORM;
>> @@ -484,35 +479,26 @@ static int tsa_of_parse_tdms(struct tsa *tsa, struct device_node *np)
>>  		val = 0;
>>  		ret = of_property_read_u32(tdm_np, "fsl,rx-frame-sync-delay-bits",
>>  					   &val);
>> -		if (ret && ret != -EINVAL) {
>> -			dev_err(tsa->dev,
>> -				"%pOF: failed to read fsl,rx-frame-sync-delay-bits\n",
>> -				tdm_np);
>> -			return ret;
>> -		}
>> -		if (val > 3) {
>> -			dev_err(tsa->dev,
>> -				"%pOF: Invalid fsl,rx-frame-sync-delay-bits (%u)\n",
>> -				tdm_np, val);
>> -			return -EINVAL;
>> -		}
>> +		if (ret && ret != -EINVAL)
>> +			return dev_err_probe(tsa->dev, ret,
>> +					     "%pOF: failed to read fsl,rx-frame-sync-delay-bits\n",
>> +					     tdm_np);
>> +		if (val > 3)
>> +			return dev_err_probe(tsa->dev, -EINVAL,
>> +					     "%pOF: Invalid fsl,rx-frame-sync-delay-bits (%u)\n",
>> +					     tdm_np, val);
>>  		tdm->simode_tdm |= TSA_SIMODE_TDM_RFSD(val);
>>  
>>  		val = 0;
>>  		ret = of_property_read_u32(tdm_np, "fsl,tx-frame-sync-delay-bits",
>>  					   &val);
>> -		if (ret && ret != -EINVAL) {
>> -			dev_err(tsa->dev,
>> -				"%pOF: failed to read fsl,tx-frame-sync-delay-bits\n",
>> -				tdm_np);
>> -			return ret;
>> -		}
>> -		if (val > 3) {
>> -			dev_err(tsa->dev,
>> -				"%pOF: Invalid fsl,tx-frame-sync-delay-bits (%u)\n",
>> -				tdm_np, val);
>> -			return -EINVAL;
>> -		}
>> +		if (ret && ret != -EINVAL)
>> +			return dev_err_probe(tsa->dev, ret,
>> +				"%pOF: failed to read fsl,tx-frame-sync-delay-bits\n", tdm_np);
>> +		if (val > 3)
>> +			return dev_err_probe(tsa->dev, -EINVAL,
>> +					     "%pOF: Invalid fsl,tx-frame-sync-delay-bits (%u)\n",
>> +					     tdm_np, val);
>>  		tdm->simode_tdm |= TSA_SIMODE_TDM_TFSD(val);
>>  
>>  		if (of_property_read_bool(tdm_np, "fsl,common-rxtx-pins"))
>> @@ -645,10 +631,8 @@ static int tsa_probe(struct platform_device *pdev)
>>  		return PTR_ERR(tsa->si_regs);
>>  
>>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "si_ram");
>> -	if (!res) {
>> -		dev_err(tsa->dev, "si_ram resource missing\n");
>> -		return -EINVAL;
>> -	}
>> +	if (!res)
>> +		return dev_err_probe(tsa->dev, -EINVAL, "si_ram resource missing\n");
>>  	tsa->si_ram_sz = resource_size(res);
>>  	tsa->si_ram = devm_ioremap_resource(&pdev->dev, res);
>>  	if (IS_ERR(tsa->si_ram))
> 
> Best regards,
> Krzysztof
>