linux-kernel - Re: [Outreachy kernel] [PATCH] net: dsa: add missing of_node

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Date:   Wed, 20 Feb 2019 09:23:31 +0530
From:   Vaishali Thakkar <vthakkar@...shalithakkar.in>
To:     Himadri Pandya <himadri18.07@...il.com>
Cc:     outreachy-kernel@...glegroups.com,
        Julia Lawall <julia.lawall@...6.fr>, andrew@...n.ch,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Outreachy kernel] [PATCH] net: dsa: add missing of_node_put

On Wed, Feb 20, 2019 at 8:54 AM Himadri Pandya <himadri18.07@...il.com> wrote:
>

Hi Himadri,

Thanks for the patch!

For the scope of Outreachy, we prefer that you send patches in staging
directory as Greg makes sure to pick them during the application
period. Of course, you're very much encouraged to contribute to other
subsystems as well but there patches are mainly picked up based on
maintainer's cycle which may or may not be picked up for linux-next when
selection of interns happens.

I hope that makes sense.

> Decrement the reference count on port while returning out of the loop.

How did you find out about this issue? I think it would be good to
give credit to tool in commit log if the issue is identified or produced
by tool. [In this case, I assume it's Coccinelle]

> Signed-off-by: Himadri Pandya <himadri18.07@...il.com>
> ---
>  net/dsa/dsa2.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
> index a1917025e155..396e7433dd8f 100644
> --- a/net/dsa/dsa2.c
> +++ b/net/dsa/dsa2.c
> @@ -624,19 +624,25 @@ static int dsa_switch_parse_ports_of(struct dsa_switch *ds,
>         for_each_available_child_of_node(ports, port) {
>                 err = of_property_read_u32(port, "reg", &reg);
>                 if (err)
> -                       return err;
> +                       goto put_port;
>
> -               if (reg >= ds->num_ports)
> -                       return -EINVAL;
> +               if (reg >= ds->num_ports) {
> +                       err = -EINVAL;
> +                       goto put_port;
> +               }
>
>                 dp = &ds->ports[reg];
>
>                 err = dsa_port_parse_of(dp, port);
>                 if (err)
> -                       return err;
> +                       goto put_port;
>         }
>
>         return 0;
> +
> +put_port:
> +       of_node_put(port);
> +       return err;
>  }
>
>  static int dsa_switch_parse_member_of(struct dsa_switch *ds,
> --
> 2.17.1
>
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