linux-kernel - Re: [PATCH -next] gpio: mockup: remove gpio debugfs when remove device

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Date:   Mon, 22 Aug 2022 11:39:29 +0800
From:   "weiyongjun (A)" <weiyongjun1@...wei.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
CC:     Bamvor Jian Zhang <bamv2005@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] gpio: mockup: remove gpio debugfs when remove
 device


On 2022/8/19 20:49, Bartosz Golaszewski wrote:
> On Tue, Aug 16, 2022 at 4:34 PM Wei Yongjun <weiyongjun1@...wei.com> wrote:
>> GPIO mockup debugfs is created in gpio_mockup_probe() but
>> forgot to remove when remove device. This patch add a devm
>> managed callback for removing them.
>>
> The tag -next is for patches that address issues that are in next but
> not yet in master.


Got it. Thanks.


>
>> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
>> ---
>>   drivers/gpio/gpio-mockup.c | 11 +++++++++++
>>   1 file changed, 11 insertions(+)
>>
>> diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
>> index 8943cea92764..1fdc444b093b 100644
>> --- a/drivers/gpio/gpio-mockup.c
>> +++ b/drivers/gpio/gpio-mockup.c
>> @@ -373,6 +373,13 @@ static void gpio_mockup_debugfs_setup(struct device *dev,
>>          }
>>   }
>>
>> +static void gpio_mockup_debugfs_cleanup(void *data)
>> +{
>> +       struct gpio_mockup_chip *chip = data;
>> +
>> +       debugfs_remove_recursive(chip->dbg_dir);
>> +}
>> +
>>   static void gpio_mockup_dispose_mappings(void *data)
>>   {
>>          struct gpio_mockup_chip *chip = data;
>> @@ -455,6 +462,10 @@ static int gpio_mockup_probe(struct platform_device *pdev)
>>
>>          gpio_mockup_debugfs_setup(dev, chip);
>>
>> +       rv = devm_add_action_or_reset(dev, gpio_mockup_debugfs_cleanup, chip);
>> +       if (rv)
>> +               return rv;
>> +
> Please return that function directly.


Will fix it.


>
>>          return 0;
>>   }
>>
>> --
>> 2.34.1
>>
> This isn't very relevant as the module needs to be unloaded anyway in
> order to reconfigure the simulated device but I'll apply it as it's
> technically correct. Did you see we have a new one - gpio-sim - that
> uses configfs?
>

gpio-mockup is used for testing other drivers with overlay dts, and 
triggered

this issue. I though gpio-sim not work with dts, but it should works well.

I will have a try to using the new gpio-sim module.