linux-kernel - Re: [PATCH v6 3/9] gpio: aggregator: add aggr_alloc()/aggr

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Message-ID: <llbybv6dpkfrtir75dveqnphrj6nuephvkoyywy6tx6vfbunl2@ft5io3thby6v>
Date: Fri, 21 Mar 2025 11:37:29 +0900
From: Koichiro Den <koichiro.den@...onical.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-gpio@...r.kernel.org, geert+renesas@...der.be, 
	linus.walleij@...aro.org, maciej.borzecki@...onical.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 3/9] gpio: aggregator: add aggr_alloc()/aggr_free()

On Thu, Mar 20, 2025 at 04:51:04PM GMT, Bartosz Golaszewski wrote:
> On Sat, Mar 15, 2025 at 5:41 PM Koichiro Den <koichiro.den@...onical.com> wrote:
> >
> > Prepare for the upcoming configfs interface. These functions will be
> > used by both the existing sysfs interface and the new configfs
> > interface, reducing code duplication.
> >
> > No functional change.
> >
> > Signed-off-by: Koichiro Den <koichiro.den@...onical.com>
> > ---
> >  drivers/gpio/gpio-aggregator.c | 58 +++++++++++++++++++++-------------
> >  1 file changed, 36 insertions(+), 22 deletions(-)
> >
> > diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
> > index e026deb4ac64..2692a31e01ac 100644
> > --- a/drivers/gpio/gpio-aggregator.c
> > +++ b/drivers/gpio/gpio-aggregator.c
> > @@ -36,12 +36,41 @@
> >  struct gpio_aggregator {
> >         struct gpiod_lookup_table *lookups;
> >         struct platform_device *pdev;
> > +       int id;
> >         char args[];
> >  };
> >
> >  static DEFINE_MUTEX(gpio_aggregator_lock);     /* protects idr */
> >  static DEFINE_IDR(gpio_aggregator_idr);
> >
> > +static int aggr_alloc(struct gpio_aggregator **aggr, size_t arg_size)
> > +{
> > +       struct gpio_aggregator *new __free(kfree) = NULL;
> > +       int ret;
> > +
> > +       new = kzalloc(sizeof(*new) + arg_size, GFP_KERNEL);
> 
> Please prefer declaring the auto variable and initializing it at the
> same time. Should be:
> 
> struct gpio_aggregator *new __free(kfree) = kzalloc(...);

Thanks for the review. Should I send v7 for this change?

Koichiro

> 
> > +       if (!new)
> > +               return -ENOMEM;
> > +
> > +       mutex_lock(&gpio_aggregator_lock);
> 
> If adding new code, please use lock guards.
> 
> Bart