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Message-ID: <57b97b0a-6570-5085-dbac-a08089791876@vivo.com>
Date: Mon, 10 Jul 2023 19:30:15 +0800
From: Yangtao Li <frank.li@...o.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Amit Kucheria <amitk@...nel.org>,
Zhang Rui <rui.zhang@...el.com>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Thara Gopinath <thara.gopinath@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
Krzysztof Kozlowski <krzk@...nel.org>,
Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v4 06/21] thermal/drivers/db8500: convert to use
devm_request*_irq_probe()
Hi Dmitry,
On 2023/7/10 19:25, Dmitry Baryshkov wrote:
> On 10/07/2023 12:59, Yangtao Li wrote:
>> There are more than 700 calls to devm_request_threaded_irq method and
>> more than 1000 calls to devm_request_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 2000 lines
>> of code can be saved by removing the msg in the driver.
>>
>> And tglx point out that:
>>
>> If we actually look at the call sites of
>> devm_request_threaded_irq() then the vast majority of them print
>> more or
>> less lousy error messages. A quick grep/sed/awk/sort/uniq revealed
>>
>> 519 messages total (there are probably more)
>>
>> 352 unique messages
>>
>> 323 unique messages after lower casing
>>
>> Those 323 are mostly just variants of the same patterns with
>> slight modifications in formatting and information provided.
>>
>> 186 of these messages do not deliver any useful information,
>> e.g. "no irq", "
>>
>> The most useful one of all is: "could request wakeup irq: %d"
>>
>> So there is certainly an argument to be made that this particular
>> function should print a well formatted and informative error message.
>>
>> It's not a general allocator like kmalloc(). It's specialized and
>> in the
>> vast majority of cases failing to request the interrupt causes the
>> device probe to fail. So having proper and consistent information why
>> the device cannot be used _is_ useful.
>>
>> So convert to use devm_request*_irq_probe() API, which ensure that all
>> error handling branches print error information.
>>
>> In this way, when this function fails, the upper-layer functions can
>> directly return an error code without missing debugging information.
>> Otherwise, the error message will be printed redundantly or missing.
>>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: Krzysztof Kozlowski <krzk@...nel.org>
>> Cc: "Uwe Kleine-König" <u.kleine-koenig@...gutronix.de>
>> Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>> Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
>> Signed-off-by: Yangtao Li <frank.li@...o.com>
>> ---
>> drivers/thermal/db8500_thermal.c | 16 ++++++----------
>> drivers/thermal/qcom/lmh.c | 7 +++----
>
> Please split LMH to a separate driver.
Sorry for mixing these two patches together,
can I add your Reviewed-by tag when the patch is resubmitted for the
next version?
Thx,
Yangtao
>
>> 2 files changed, 9 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/thermal/db8500_thermal.c
>> b/drivers/thermal/db8500_thermal.c
>> index fca5c2c93bf9..0ef8fc2eb4a1 100644
>> --- a/drivers/thermal/db8500_thermal.c
>> +++ b/drivers/thermal/db8500_thermal.c
>> @@ -164,25 +164,21 @@ static int db8500_thermal_probe(struct
>> platform_device *pdev)
>> if (low_irq < 0)
>> return low_irq;
>> - ret = devm_request_threaded_irq(dev, low_irq, NULL,
>> + ret = devm_request_threaded_irq_probe(dev, low_irq, NULL,
>> prcmu_low_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
>> - "dbx500_temp_low", th);
>> - if (ret < 0) {
>> - dev_err(dev, "failed to allocate temp low irq\n");
>> + "dbx500_temp_low", th, "temp low");
>> + if (ret < 0)
>> return ret;
>> - }
>> high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");
>> if (high_irq < 0)
>> return high_irq;
>> - ret = devm_request_threaded_irq(dev, high_irq, NULL,
>> + ret = devm_request_threaded_irq_probe(dev, high_irq, NULL,
>> prcmu_high_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
>> - "dbx500_temp_high", th);
>> - if (ret < 0) {
>> - dev_err(dev, "failed to allocate temp high irq\n");
>> + "dbx500_temp_high", th, "temp high");
>> + if (ret < 0)
>> return ret;
>> - }
>> /* register of thermal sensor and get info from DT */
>> th->tz = devm_thermal_of_zone_register(dev, 0, th, &thdev_ops);
>> diff --git a/drivers/thermal/qcom/lmh.c b/drivers/thermal/qcom/lmh.c
>> index f6edb12ec004..48a14d7e8bf5 100644
>> --- a/drivers/thermal/qcom/lmh.c
>> +++ b/drivers/thermal/qcom/lmh.c
>> @@ -207,11 +207,10 @@ static int lmh_probe(struct platform_device *pdev)
>> /* Disable the irq and let cpufreq enable it when ready to
>> handle the interrupt */
>> irq_set_status_flags(lmh_data->irq, IRQ_NOAUTOEN);
>> - ret = devm_request_irq(dev, lmh_data->irq, lmh_handle_irq,
>> - IRQF_ONESHOT | IRQF_NO_SUSPEND,
>> - "lmh-irq", lmh_data);
>> + ret = devm_request_irq_probe(dev, lmh_data->irq, lmh_handle_irq,
>> + IRQF_ONESHOT | IRQF_NO_SUSPEND,
>> + "lmh-irq", lmh_data, NULL);
>> if (ret) {
>> - dev_err(dev, "Error %d registering irq %x\n", ret,
>> lmh_data->irq);
>> irq_domain_remove(lmh_data->domain);
>> return ret;
>> }
>
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