linux-kernel - Re: [PATCH v3 1/5] genirq/devres: Add devm_request_threaded_irq

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Date:   Mon, 3 Jul 2023 15:37:16 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Yangtao Li <frank.li@...o.com>, miquel.raynal@...tlin.com,
        rafael@...nel.org, daniel.lezcano@...aro.org, amitk@...nel.org,
        rui.zhang@...el.com, mmayer@...adcom.com,
        bcm-kernel-feedback-list@...adcom.com,
        florian.fainelli@...adcom.com, tglx@...utronix.de,
        matthias.bgg@...il.com, angelogioacchino.delregno@...labora.com,
        bchihi@...libre.com, wenst@...omium.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 1/5] genirq/devres: Add
 devm_request_threaded_irq_emsg()

On 03/07/2023 15:24, Yangtao Li wrote:
> 
> On 2023/7/3 20:31, Krzysztof Kozlowski wrote:
>> [你通常不会收到来自 krzk@...nel.org 的电子邮件。请访问 https://aka.ms/LearnAboutSenderIdentification，以了解这一点为什么很重要]
>>
>> On 03/07/2023 11:04, Yangtao Li wrote:
>>> There are more than 700 calls to the devm_request_threaded_irq method.
>>> Most drivers only request one interrupt resource, and these error
>>> messages are basically the same. If error messages are printed
>>> everywhere, more than 1000 lines of code can be saved by removing the
>>> msg in the driver.
>>
>> ...
>>
>>> +int devm_request_threaded_irq_emsg(struct device *dev, unsigned int irq,
>>> +                                irq_handler_t handler, irq_handler_t thread_fn,
>>> +                                unsigned long irqflags, const char *devname,
>>> +                                void *dev_id, const char *emsg)
>>> +{
>>> +     int rc;
>>> +
>>> +     rc = devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
>>> +                                    devname, dev_id);
>>> +     if (rc && rc != -EPROBE_DEFER) {
>>> +             dev_err(dev, "Failed to request %sinterrupt %u %s %s: %pe\n",
>>> +                     thread_fn ? "threaded " : "", irq, devname ? : dev_name(dev),
>>> +                     emsg ? : "", ERR_PTR(rc));
>> It is open-coding dev_err_probe(). Just use dev_err_probe instead.
> 
> 
> How about the following? If possible, I would like to start modifying 
> more drivers in the next version.
> 
> 
> int devm_request_threaded_irq_emsg(struct device *dev, unsigned int irq,
>                                     irq_handler_t handler, irq_handler_t 
> thread_fn,
>                                     unsigned long irqflags, const char 
> *devname,
>                                     void *dev_id, const char *emsg)
> {
>          int rc;
> 
>          rc = devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
>                                         devname, dev_id);
>          if (rc) {
>                  dev_err_probe(dev, rc, "Failed to request %sinterrupt 
> %u %s %s\n",
>                                thread_fn ? "threaded " : "", irq, 
> devname ? : dev_name(dev),
>                                emsg ? : "");

That's not the syntax already used - see existing code with `git grep`.
Instead - return dev_err_probe().


Best regards,
Krzysztof