RE: [PATCH 20/21] pinctrl: aspeed: g5: Use scope based of_node_put() cleanups

[Peng Fan]

> Subject: Re: [PATCH 20/21] pinctrl: aspeed: g5: Use scope based
> of_node_put() cleanups
>
> On Wed, 2024-05-01 at 20:56 +0800, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@xxxxxxx>
> >
> > Use scope based of_node_put() cleanup to simplify code.
> >
> > Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> > ---
> >  drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c | 6 ++----
> >  1 file changed, 2 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c
> > b/drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c
> > index 5bb8fd0d1e41..61fbfddb5938 100644
> > --- a/drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c
> > +++ b/drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c
> > @@ -2629,14 +2629,13 @@ static struct regmap
> *aspeed_g5_acquire_regmap(struct aspeed_pinmux_data *ctx,
> >             return ctx->maps[ip];
> >
> >     if (ip == ASPEED_IP_GFX) {
> > -           struct device_node *node;
> > +           struct device_node *node __free(device_node) = NULL;
> >             struct regmap *map;
> >
> >             node = of_parse_phandle(ctx->dev->of_node,
> >                                     "aspeed,external-nodes", 0);
> >             if (node) {
> >                     map = syscon_node_to_regmap(node);
> > -                   of_node_put(node);
> >                     if (IS_ERR(map))
> >                             return map;
> >             } else
> > @@ -2648,7 +2647,7 @@ static struct regmap
> *aspeed_g5_acquire_regmap(struct aspeed_pinmux_data *ctx,
> >     }
> >
> >     if (ip == ASPEED_IP_LPC) {
> > -           struct device_node *np;
> > +           struct device_node *np __free(device_node) = NULL;
> >             struct regmap *map;
> >
> >             np = of_parse_phandle(ctx->dev->of_node,
> > @@ -2660,7 +2659,6 @@ static struct regmap
> *aspeed_g5_acquire_regmap(struct aspeed_pinmux_data *ctx,
> >                             return ERR_PTR(-ENODEV);
> >
> >                     map = syscon_node_to_regmap(np->parent);
> > -                   of_node_put(np);
> >                     if (IS_ERR(map))
> >                             return map;
>
> I think I agree with Krzysztof's feedback on the Samsung patch[1], and that I
> prefer the existing approach for the Aspeed driver. My reasoning suggests the
> existing implementation does the right thing. That said, the code could be
> adjusted to use early returns and consistent variable names, which might
> make it easier to reason about.

No problem, let's keep the code as it is.

Thanks,
Peng

I'll consider a follow-up patch to address that.
>
> Regardless, thanks for taking the time to explore the cleanup.
>
> Andrew
>
> [1]:
> https://lore.ke/
> rnel.org%2Flkml%2F34193501-5b7b-4ffd-8549-
> a04c6930d02d%40kernel.org%2F&data=05%7C02%7Cpeng.fan%40nxp.com
> %7C44ef77e479264eccd73f08dc6a4263c6%7C686ea1d3bc2b4c6fa92cd99c5
> c301635%7C0%7C0%7C638502080600849943%7CUnknown%7CTWFpbGZs
> b3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn
> 0%3D%7C0%7C%7C%7C&sdata=tuUu1IeqM5sQjqiN1fwzPAbSoZw%2FUNEd2
> u%2BzpaBhJ4M%3D&reserved=0
>
> >             } else
> >