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Date: Mon, 10 Jul 2023 14:25:59 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Yangtao Li <frank.li@...o.com>,
"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()
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.
> 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;
> }
--
With best wishes
Dmitry
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