linux-kernel - Re: [PATCH] nvdimm: Use of_property_present() and of_property_read

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Message-ID: <CAL_JsqKC5S_-vJjdYEsoFHAQiQvymVDE4_moy5g_p7YEfAmDLA@mail.gmail.com>
Date: Tue, 3 Sep 2024 14:17:33 -0500
From: Rob Herring <robh@...nel.org>
To: Dan Williams <dan.j.williams@...el.com>, Vishal Verma <vishal.l.verma@...el.com>, 
	Dave Jiang <dave.jiang@...el.com>, Ira Weiny <ira.weiny@...el.com>, 
	"Oliver O'Halloran" <oohall@...il.com>, Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc: nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvdimm: Use of_property_present() and of_property_read_bool()

On Wed, Jul 31, 2024 at 2:14 PM Rob Herring (Arm) <robh@...nel.org> wrote:
>
> Use of_property_present() and of_property_read_bool() to test
> property presence and read boolean properties rather than
> of_(find|get)_property(). This is part of a larger effort to remove
> callers of of_find_property() and similar functions.
> of_(find|get)_property() leak the DT struct property and data pointers
> which is a problem for dynamically allocated nodes which may be freed.
>
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
> ---
>  drivers/nvdimm/of_pmem.c | 2 +-
>  drivers/nvmem/layouts.c  | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

Ping

> diff --git a/drivers/nvdimm/of_pmem.c b/drivers/nvdimm/of_pmem.c
> index 403384f25ce3..b4a1cf70e8b7 100644
> --- a/drivers/nvdimm/of_pmem.c
> +++ b/drivers/nvdimm/of_pmem.c
> @@ -47,7 +47,7 @@ static int of_pmem_region_probe(struct platform_device *pdev)
>         }
>         platform_set_drvdata(pdev, priv);
>
> -       is_volatile = !!of_find_property(np, "volatile", NULL);
> +       is_volatile = of_property_read_bool(np, "volatile");
>         dev_dbg(&pdev->dev, "Registering %s regions from %pOF\n",
>                         is_volatile ? "volatile" : "non-volatile",  np);
>
> diff --git a/drivers/nvmem/layouts.c b/drivers/nvmem/layouts.c
> index 77a4119efea8..65d39e19f6ec 100644
> --- a/drivers/nvmem/layouts.c
> +++ b/drivers/nvmem/layouts.c
> @@ -123,7 +123,7 @@ static int nvmem_layout_bus_populate(struct nvmem_device *nvmem,
>         int ret;
>
>         /* Make sure it has a compatible property */
> -       if (!of_get_property(layout_dn, "compatible", NULL)) {
> +       if (!of_property_present(layout_dn, "compatible")) {
>                 pr_debug("%s() - skipping %pOF, no compatible prop\n",
>                          __func__, layout_dn);
>                 return 0;
> --
> 2.43.0
>