linux-kernel - Re: [PATCH v4 05/11] gpiolib: provide gpio_device_get

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Message-ID: <ZRqUOcssSyTgPJno@smile.fi.intel.com>
Date:   Mon, 2 Oct 2023 12:58:17 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v4 05/11] gpiolib: provide gpio_device_get_desc()

On Mon, Oct 02, 2023 at 11:54:40AM +0200, Bartosz Golaszewski wrote:
> On Mon, Oct 2, 2023 at 11:46 AM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> > On Wed, Sep 27, 2023 at 04:29:25PM +0200, Bartosz Golaszewski wrote:
> > > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > >
> > > Getting the GPIO descriptor directly from the gpio_chip struct is
> > > dangerous as we don't take the reference to the underlying GPIO device.
> > > In order to start working towards removing gpiochip_get_desc(), let's
> > > provide a safer variant that works with an existing reference to struct
> > > gpio_device.

...

> > > +EXPORT_SYMBOL_GPL(gpiochip_get_desc);
> >
> > > +struct gpio_desc *
> > > +gpio_device_get_desc(struct gpio_device *gdev, unsigned int hwnum)
> >
> > I'm wondering if you move this to be upper than gpiochip_get_desc() and
> > diff will look better...
> 
> There's a limit to bikeshedding in my book and "making the diff look
> better" is definitely it. :)

Right, but if you are going to send a new version it might makes sense
to try, no?

-- 
With Best Regards,
Andy Shevchenko