linux-kernel - Re: [PATCH v2] media: i2c: ov5647: replacing of_node_put with __free(device

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Date: Thu, 13 Jun 2024 17:18:13 +0100
From: Dave Stevenson <dave.stevenson@...pberrypi.com>
To: Abdulrasaq Lawani <abdulrasaqolawani@...il.com>
Cc: sakari.ailus@...ux.intel.com, jacopo@...ndi.org, mchehab@...nel.org, 
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
	skhan@...uxfoundation.org, javier.carrasco.cruz@...il.com, 
	julia.lawall@...ia.fr
Subject: Re: [PATCH v2] media: i2c: ov5647: replacing of_node_put with __free(device_node)

On Wed, 12 Jun 2024 at 11:53, Abdulrasaq Lawani
<abdulrasaqolawani@...il.com> wrote:
>
> Replace instance of of_node_put with __free(device_node)
> to protect against any memory leaks due to future changes
> in control flow.
>
> Signed-off-by: Abdulrasaq Lawani <abdulrasaqolawani@...il.com>

Conditional ack had already been given on v1.
I don't know this new __free well enough to give an R-b, but it looks sane.

Acked-by: Dave Stevenson <dave.stevenson@...pberrypi.com>

> ---
>  drivers/media/i2c/ov5647.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
> index 7e1ecdf2485f..0fb4d7bff9d1 100644
> --- a/drivers/media/i2c/ov5647.c
> +++ b/drivers/media/i2c/ov5647.c
> @@ -1360,24 +1360,21 @@ static int ov5647_parse_dt(struct ov5647 *sensor, struct device_node *np)
>         struct v4l2_fwnode_endpoint bus_cfg = {
>                 .bus_type = V4L2_MBUS_CSI2_DPHY,
>         };
> -       struct device_node *ep;
> +       struct device_node *ep __free(device_node) =
> +               of_graph_get_endpoint_by_regs(np, 0, -1);
>         int ret;
>
> -       ep = of_graph_get_endpoint_by_regs(np, 0, -1);
>         if (!ep)
>                 return -EINVAL;
>
>         ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &bus_cfg);
>         if (ret)
> -               goto out;
> +               return ret;
>
>         sensor->clock_ncont = bus_cfg.bus.mipi_csi2.flags &
>                               V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
>
> -out:
> -       of_node_put(ep);
> -
> -       return ret;
> +       return 0;
>  }
>
>  static int ov5647_probe(struct i2c_client *client)
> --
> 2.43.0
>