linux-kernel - Re: [PATCH] gpio: tb10x: Fix an error handling path in tb10x_gpio

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Date:   Sat, 16 Sep 2023 17:10:10 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     linus.walleij@...aro.org, andy@...nel.org, galak@...eaurora.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] gpio: tb10x: Fix an error handling path in
 tb10x_gpio_probe()

Le 03/09/2023 à 19:02, Bartosz Golaszewski a écrit :
> On Sun, Sep 3, 2023 at 8:13 AM Christophe JAILLET
> <christophe.jaillet@...adoo.fr> wrote:
>>
>> If an error occurs after a successful irq_domain_add_linear() call, it
>> should be undone by a corresponding irq_domain_remove(), as already done
>> in the remove function.
>>
>> Fixes: c6ce2b6bffe5 ("gpio: add TB10x GPIO driver")
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>> ---
>>   drivers/gpio/gpio-tb10x.c | 6 +++++-
>>   1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpio/gpio-tb10x.c b/drivers/gpio/gpio-tb10x.c
>> index 78f8790168ae..f96d260a4a19 100644
>> --- a/drivers/gpio/gpio-tb10x.c
>> +++ b/drivers/gpio/gpio-tb10x.c
>> @@ -195,7 +195,7 @@ static int tb10x_gpio_probe(struct platform_device *pdev)
>>                                  handle_edge_irq, IRQ_NOREQUEST, IRQ_NOPROBE,
>>                                  IRQ_GC_INIT_MASK_CACHE);
>>                  if (ret)
>> -                       return ret;
>> +                       goto err_remove_domain;
>>
>>                  gc = tb10x_gpio->domain->gc->gc[0];
>>                  gc->reg_base                         = tb10x_gpio->base;
>> @@ -209,6 +209,10 @@ static int tb10x_gpio_probe(struct platform_device *pdev)
>>          }
>>
>>          return 0;
>> +
>> +err_remove_domain:
>> +       irq_domain_remove(tb10x_gpio->domain);
>> +       return ret;
>>   }
>>
>>   static int tb10x_gpio_remove(struct platform_device *pdev)
>> --
>> 2.34.1
>>
> 
> That's not enough, you also need to dispose of all remaining mappings.
> Please see drivers/gpio/gpiolib.c and how it handles the gpio_irq_chip
> domain.

Hi,

you'll have to give me more explanation because I've not been able to 
find anything useful to me.

CJ

> 
> Bartosz
>