linux-kernel - Re: [PATCH 26/44] kdbus: Cleanup kdbus_pin

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Date:	Thu, 8 Oct 2015 16:40:33 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	Sergei Zviagintsev <sergei@...v.net>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Mack <daniel@...que.org>,
	Djalal Harouni <tixxdz@...ndz.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 26/44] kdbus: Cleanup kdbus_pin_dst()

Hi

On Thu, Oct 8, 2015 at 1:31 PM, Sergei Zviagintsev <sergei@...v.net> wrote:
>  - Reduce scope of `owner' var to the block where it is actually used.
>    Use conditional operator to set its value.
>
>  - Drop initialization of `dst' as it gets value later.
>
>  - Drop separate exit point as we have only one use case of it.
>
> Signed-off-by: Sergei Zviagintsev <sergei@...v.net>
> ---
>  ipc/kdbus/connection.c | 17 ++++++-----------
>  1 file changed, 6 insertions(+), 11 deletions(-)
>
> diff --git a/ipc/kdbus/connection.c b/ipc/kdbus/connection.c
> index 6a73ac3f444d..ace587ee951a 100644
> --- a/ipc/kdbus/connection.c
> +++ b/ipc/kdbus/connection.c
> @@ -1048,10 +1048,8 @@ static int kdbus_pin_dst(struct kdbus_bus *bus,
>                          struct kdbus_conn **out_dst)
>  {
>         const struct kdbus_msg *msg = staging->msg;
> -       struct kdbus_name_owner *owner = NULL;
>         struct kdbus_name_entry *name = NULL;
> -       struct kdbus_conn *dst = NULL;
> -       int ret;
> +       struct kdbus_conn *dst;
>
>         lockdep_assert_held(&bus->name_registry->rwlock);
>
> @@ -1061,14 +1059,15 @@ static int kdbus_pin_dst(struct kdbus_bus *bus,
>                         return -ENXIO;
>
>                 if (!kdbus_conn_is_ordinary(dst)) {
> -                       ret = -ENXIO;
> -                       goto error;
> +                       kdbus_conn_unref(dst);
> +                       return -ENXIO;

Looks good.

>                 }
>         } else {
> +               struct kdbus_name_owner *owner;
> +

I'd prefer if you avoid making this block-local.

>                 name = kdbus_name_lookup_unlocked(bus->name_registry,
>                                                   staging->dst_name);
> -               if (name)
> -                       owner = kdbus_name_get_owner(name);
> +               owner = name ? kdbus_name_get_owner(name) : NULL;

Looks good.

>                 if (!owner)
>                         return -ESRCH;
>
> @@ -1094,10 +1093,6 @@ static int kdbus_pin_dst(struct kdbus_bus *bus,
>         *out_name = name;
>         *out_dst = dst;
>         return 0;
> -
> -error:
> -       kdbus_conn_unref(dst);
> -       return ret;

Looks good.

Thanks
David

>  }
>
>  static int kdbus_conn_reply(struct kdbus_conn *src,
> --
> 1.8.3.1
>
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