linux-kernel - Re: [PATCH 21/44] kdbus: Cleanup tests in kdbus_cmd

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Date:	Fri, 9 Oct 2015 21:07:48 +0300
From:	Sergei Zviagintsev <sergei@...v.net>
To:	David Herrmann <dh.herrmann@...il.com>
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 21/44] kdbus: Cleanup tests in kdbus_cmd_send()

On Thu, Oct 08, 2015 at 04:30:59PM +0200, David Herrmann wrote:
> Hi
> 
> On Thu, Oct 8, 2015 at 1:31 PM, Sergei Zviagintsev <sergei@...v.net> wrote:
> > Rearrange tests a little to make them look cleaner.
> 
> What's wrong with 'else if'?

Less verbose constructions are easier for our brain to accept :)
Moreover, we usually don't write code in the 'else' branch of
if-statement which handles an error-path.

But I don't mind dropping this patch, it really doesn't save the
universe.

> 
> Thanks
> David
> 
> > Signed-off-by: Sergei Zviagintsev <sergei@...v.net>
> > ---
> >  ipc/kdbus/connection.c | 9 +++++----
> >  1 file changed, 5 insertions(+), 4 deletions(-)
> >
> > diff --git a/ipc/kdbus/connection.c b/ipc/kdbus/connection.c
> > index 93da7f539f74..a4d7414ecaea 100644
> > --- a/ipc/kdbus/connection.c
> > +++ b/ipc/kdbus/connection.c
> > @@ -1977,7 +1977,7 @@ int kdbus_cmd_send(struct kdbus_conn *conn, struct file *f, void __user *argp)
> >         ret = kdbus_args_parse(&args, argp, &cmd);
> >         if (ret < 0)
> >                 goto exit;
> > -       else if (ret > 0 && !cmd->msg_address) /* negotiation without msg */
> > +       if (ret > 0 && !cmd->msg_address) /* negotiation without msg */
> >                 goto exit;
> >
> >         ret2 = kdbus_args_parse_msg(&msg_args, KDBUS_PTR(cmd->msg_address),
> > @@ -1985,10 +1985,11 @@ int kdbus_cmd_send(struct kdbus_conn *conn, struct file *f, void __user *argp)
> >         if (ret2 < 0) { /* cannot parse message */
> >                 ret = ret2;
> >                 goto exit;
> > -       } else if (ret2 > 0 && !ret) { /* msg-negot implies cmd-negot */
> > -               ret = -EINVAL;
> > +       }
> > +       if (ret > 0) /* negotiation */
> >                 goto exit;
> > -       } else if (ret > 0) { /* negotiation */
> > +       if (ret2 > 0) { /* msg-negot implies cmd-negot */
> > +               ret = -EINVAL;
> >                 goto exit;
> >         }
> >
> > --
> > 1.8.3.1
> >
--
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