linux-kernel - Re: [PATCH] gpiolib: Allow to use setters with return value for output-only gpios

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Message-Id: <D93SHIBVZQTE.1U2YFWQT253SW@bootlin.com>
Date: Fri, 11 Apr 2025 13:56:58 +0200
From: "Mathieu Dubois-Briand" <mathieu.dubois-briand@...tlin.com>
To: "Bartosz Golaszewski" <brgl@...ev.pl>
Cc: "Linus Walleij" <linus.walleij@...aro.org>,
 <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>, "Thomas
 Petazzoni" <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH] gpiolib: Allow to use setters with return value for
 output-only gpios

On Fri Apr 11, 2025 at 1:38 PM CEST, Bartosz Golaszewski wrote:
> On Fri, Apr 11, 2025 at 12:31 PM Mathieu Dubois-Briand
> <mathieu.dubois-briand@...tlin.com> wrote:
>>
>> The gpiod_direction_output_raw_commit() function checks if any setter
>> callback is present before doing anything. As the new GPIO setters with
>> return values were introduced, make this check also succeed if one is
>> present.
>>
>> Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
>> ---
>>  drivers/gpio/gpiolib.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
>> index b8197502a5ac..cd4fecbb41f2 100644
>> --- a/drivers/gpio/gpiolib.c
>> +++ b/drivers/gpio/gpiolib.c
>> @@ -2879,7 +2879,7 @@ static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value)
>>          * output-only, but if there is then not even a .set() operation it
>>          * is pretty tricky to drive the output line.
>>          */
>> -       if (!guard.gc->set && !guard.gc->direction_output) {
>> +       if (!guard.gc->set && !guard.gc->set_rv && !guard.gc->direction_output) {
>>                 gpiod_warn(desc,
>>                            "%s: missing set() and direction_output() operations\n",
>>                            __func__);
>>
>> ---
>> base-commit: 0af2f6be1b4281385b618cb86ad946eded089ac8
>> change-id: 20250411-mdb-gpiolib-setters-fix-b87976992070
>>
>> Best regards,
>> --
>> Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
>>
>
> Ah good catch. Since the culprit is already in mainline, would you
> mind resending with Cc: stable and Fixes: tags?
>
> Bart

Thanks, I had a doubt about stable, as I believe this only reached rc1
so far. I will send a new version a bit later today.

Mathieu

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com