linux-kernel - Re: [PATCH] thermal: sun8i: Be loud when probe fails

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Date:   Wed, 8 Jul 2020 14:42:12 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Ondřej Jirman <megous@...ous.com>,
        Frank Lee <tiny.windzz@...il.com>,
        linux-sunxi@...glegroups.com,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amit.kucheria@...durent.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        "open list:ALLWINNER THERMAL DRIVER" <linux-pm@...r.kernel.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] thermal: sun8i: Be loud when probe fails

On 2020-07-08 14:21, Ondřej Jirman wrote:
[...]
>>> @@ -523,10 +547,17 @@ static int sun8i_ths_probe(struct platform_device *pdev)
>>>          ret = devm_request_threaded_irq(dev, irq, NULL,
>>>                                          sun8i_irq_thread,
>>>                                          IRQF_ONESHOT, "ths", tmdev);
>>> -       if (ret)
>>> -               return ret;
>>> +       if (ret) {
>>> +               dev_err(dev, "Failed to request irq (%d)\n", ret);
>>> +               goto err_out;
>>> +       }
>>>
>>> +       dev_info(dev, "Thermal sensor ready!\n");
>>>          return 0;
>>> +
>>> +err_out:
>>> +       dev_err(dev, "Failed to probe thermal sensor (%d)\n", ret);
>>
>> When the driver fails, there will be this print. Isn't it superfluous
>> for you to add these？
>>
>> sun8i-thermal: probe of 5070400.thermal-sensor failed with error
> 
> There's no such failure message in the case I investigated, which is
> EPROBE_DEFER failure waiting for nvmem driver that never loads,
> because it's not configured by the user to build.

Ah, in that case this was a bit misleading, since "probe failure" isn't 
really the problem at all. As it happens, there's a whole other 
discussion ongoing around making probe deferral issues easier to debug:

https://lore.kernel.org/linux-arm-kernel/20200626100103.18879-1-a.hajda@samsung.com/

Robin.