Re: [PATCH 2/2] gpio: gpiolib: set gpiochip_remove retval to void

From: abdoulaye berthe
Date: Mon Jun 09 2014 - 17:22:16 EST


How about using the interface tracker described in the link bellow ?
https://lkml.org/lkml/2014/5/5/55
Abdoulaye.



On Sun, Jun 8, 2014 at 2:12 PM, Alexandre Courbot <gnurou@xxxxxxxxx> wrote:
> On Thu, Jun 5, 2014 at 3:22 AM, abdoulaye berthe <berthe.ab@xxxxxxxxx> wrote:
>> This avoids handling gpiochip remove error in device
>> remove handler.
>>
>> Signed-off-by: abdoulaye berthe <berthe.ab@xxxxxxxxx>
>> ---
>> drivers/gpio/gpiolib.c | 24 +++++++-----------------
>> include/linux/gpio/driver.h | 2 +-
>> 2 files changed, 8 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
>> index f48817d..022543f 100644
>> --- a/drivers/gpio/gpiolib.c
>> +++ b/drivers/gpio/gpiolib.c
>> @@ -1263,10 +1263,9 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip);
>> *
>> * A gpio_chip with any GPIOs still requested may not be removed.
>> */
>> -int gpiochip_remove(struct gpio_chip *chip)
>> +void gpiochip_remove(struct gpio_chip *chip)
>> {
>> unsigned long flags;
>> - int status = 0;
>> unsigned id;
>>
>> acpi_gpiochip_remove(chip);
>> @@ -1278,24 +1277,15 @@ int gpiochip_remove(struct gpio_chip *chip)
>> of_gpiochip_remove(chip);
>>
>> for (id = 0; id < chip->ngpio; id++) {
>> - if (test_bit(FLAG_REQUESTED, &chip->desc[id].flags)) {
>> - status = -EBUSY;
>> - break;
>> - }
>> - }
>> - if (status == 0) {
>> - for (id = 0; id < chip->ngpio; id++)
>> - chip->desc[id].chip = NULL;
>> -
>> - list_del(&chip->list);
>> + if (test_bit(FLAG_REQUESTED, &chip->desc[id].flags))
>> + panic("gpio: removing gpiochip with gpios still requested\n");
>
> Really, really I don't think we should panic here. Apparently if you
> don't do this things are going to crash later on some platforms. Could
> you detail what the problem is exactly so we can try and come with a
> solution?
>
> Event if we crash later with a more obscure reason, using pr_err()
> here to provide some information should be helpful enough.
>
> Alex.
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