From owner-svn-src-head@freebsd.org  Mon Aug  3 18:45:42 2015
Return-Path: <owner-svn-src-head@freebsd.org>
Delivered-To: svn-src-head@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 665AF9B2E53;
 Mon,  3 Aug 2015 18:45:42 +0000 (UTC)
 (envelope-from loos.br@gmail.com)
Received: from mail-lb0-x231.google.com (mail-lb0-x231.google.com
 [IPv6:2a00:1450:4010:c04::231])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 07859164B;
 Mon,  3 Aug 2015 18:45:42 +0000 (UTC)
 (envelope-from loos.br@gmail.com)
Received: by lbqc9 with SMTP id c9so57359037lbq.1;
 Mon, 03 Aug 2015 11:45:40 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:in-reply-to:references:date:message-id:subject:from:to
 :cc:content-type;
 bh=0jr4Q5Q6bSnWsrODk9LPNXYQTRAlC1KHTlqo9aQ0DRY=;
 b=yNW7L0vR9RC4oKU+pv5a/TRpKdPvi9hdZkdA7bNeju7/j8RNUM5x/pskWPeGDd0zJ1
 +PXNSJ+F+5PZEpQFRXK/T9ahEsNMpU4hxNqBOcPswfnNwRJAu5NwXM6RnHDHL0qoNOMw
 ft5Zr5v+5WBkU83ZjNfSrf1t4ISoPJszKWacoyNi1dQVRSNXqahmZBjb0KAURHTJ5o0+
 fbn+C/tD/Kn3l3e2+mQr0DjyA3oRDtNvJ0Z2yDrr7CkuHiuqHaxUIql+jG5QHgtX3D+i
 ArZKyUelo277pQC63782v+VkcGRiVI2shoyl4B34sA9siXucffc5lFnu2GY0K15vawX4
 pWUg==
MIME-Version: 1.0
X-Received: by 10.152.181.34 with SMTP id dt2mr18291579lac.84.1438627539930;
 Mon, 03 Aug 2015 11:45:39 -0700 (PDT)
Received: by 10.152.112.170 with HTTP; Mon, 3 Aug 2015 11:45:39 -0700 (PDT)
In-Reply-To: <EB54E04B-2312-495E-8D36-DD283582E256@gmail.com>
References: <201507312143.t6VLhSBm046797@repo.freebsd.org>
 <CABh_MKn5vfXB4Hv3mfAVgy7g98_U+cQ=XKyVTLdVJO3pp0-05Q@mail.gmail.com>
 <EB54E04B-2312-495E-8D36-DD283582E256@gmail.com>
Date: Mon, 3 Aug 2015 15:45:39 -0300
Message-ID: <CAJ8CS7q5B2gZvC=OYvGQxnhk0qmSF1h5XEVi1ZEPzdoTZynwpA@mail.gmail.com>
Subject: Re: svn commit: r286142 - head/sys/net
From: Luiz Otavio O Souza <loos.br@gmail.com>
To: Guy Helmer <guy.helmer@gmail.com>
Cc: Ed Schouten <ed@nuxi.nl>, Luiz Otavio O Souza <loos@freebsd.org>,
 src-committers@freebsd.org, 
 svn-src-all@freebsd.org, svn-src-head@freebsd.org
Content-Type: text/plain; charset=UTF-8
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 03 Aug 2015 18:45:42 -0000

On Sat, Aug 1, 2015 at 6:02 PM, Guy Helmer wrote:
>
>> On Aug 1, 2015, at 4:50 AM, Ed Schouten wrote:
>>
>> Hi Luiz,
>>
>> 2015-07-31 23:43 GMT+02:00 Luiz Otavio O Souza <loos@freebsd.org>:
>>> -               while (d->bd_hbuf_in_use)
>>> -                       mtx_sleep(&d->bd_hbuf_in_use, &d->bd_lock,
>>> -                           PRINET, "bd_hbuf", 0);
>>
>> Would it make sense to replace them by an assertion, instead of
>> omitting them entirely?
>>
>> KASSERT(!d->bd_hbuf_in_use, ("..."));
>
> I would appreciate the confidence that would provide.
>
> Guy

Yeah, I agree.  The KASSERT() makes the code even easier to understand.

Note that only one KASSERT() is needed here, because to other case is
specific to zero-copy buffers and the zero-copy buffers cannot be read
with read(2) and this way they never set the in use flag for the hold
buffer.

Committed in r286243.

Thanks!

Luiz