From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A3896C433DB for ; Thu, 4 Mar 2021 19:36:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6850364EAE for ; Thu, 4 Mar 2021 19:36:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231296AbhCDTfr (ORCPT ); Thu, 4 Mar 2021 14:35:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44718 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229715AbhCDTfi (ORCPT ); Thu, 4 Mar 2021 14:35:38 -0500 Received: from mail-ej1-x62e.google.com (mail-ej1-x62e.google.com [IPv6:2a00:1450:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6CB32C061574 for ; Thu, 4 Mar 2021 11:34:58 -0800 (PST) Received: by mail-ej1-x62e.google.com with SMTP id r17so51648449ejy.13 for ; Thu, 04 Mar 2021 11:34:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vanguardiasur-com-ar.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=P5ZGS9SozG7SPJd7V+gBgZUerMurs1Mdjd6yuPEEvaU=; b=tBiasoTv2LxT4a0ybJ6WF7ayIBf4XYQW/xR8PJlVlPmWGbTgohO4r4XuX4iL6WQY6X 7Do4NLO3+HpsnxlqWjH6FQT9PMbuePV+qUecLFYPZ619M3ON8PIG/fiZGL3UjANma92V paCOI19Xpwg/FW9fbq8+YcaHYILugK21z7UrilYzY3to/n9NApr54gBezoFysEA95R1H JsdPPCJAqgGfZesd5WszeFHywtJTmUCsPRav/MR9PJyi1KGI+U53F8EZA9t9EHqod1o6 UgUbDOMg8Wx4bu1i+xouZ2y75Hf3Ci2tOD6nWyPkgeKL9LTSJNu2yxmITXaV+QlQHn5K 4+Bw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=P5ZGS9SozG7SPJd7V+gBgZUerMurs1Mdjd6yuPEEvaU=; b=poIiDK7PLh+MHbnKWTbCQqmIgArxLUBWT7GX1rAlrOaRwi7OQ6Aq7nbbapEPCuk9uv iFKImSjGVlToQKC+bVpJB1FUm2fGSB4By81TFMC6hreV1371+9BSJHYH3xxyd8/vsYov 84QePhP0ER7OYRpUxHF8GYgcoROy/d2AqcLnrAiKU9mok6g1DxBWVY/fk0J4pLpz13XF 0Lfc/sUlK6n3gdFzM4xRwFpBRUmOlb2MP/t6NKc6WaGiUBOA2g/AIFodylr+Dg352D/w 3qBfn4irkDIfpGVHtveJ1kUfCNaohgwyfbzgrWX3/7HnFV9u/q0beaZ53o3VGJM8v+D4 Pg+w== X-Gm-Message-State: AOAM533+BOuhMovdToBHkuH7YdrLbhjE61+opwBjduGU40XBSgk5cWGB dpyfPjds4UmRpP6YDxVoHimVvpjIICgCuEwjZ9qE0Q== X-Google-Smtp-Source: ABdhPJya9onErgd7RmZV2QbMXsvyyX4P5lmwTcopxxOeiGXh+75lyKSQOGP8w3fJPmgTDoN4HPOeRGhtSkKcwauMSqA= X-Received: by 2002:a17:906:32d1:: with SMTP id k17mr6076815ejk.141.1614886497160; Thu, 04 Mar 2021 11:34:57 -0800 (PST) MIME-Version: 1.0 References: <45cda97c-a0e4-eef2-ba8f-ddc7e33b40d5@penguintechs.org> <4cdd691f-dc55-fc6e-1830-ac0c24b8e96b@penguintechs.org> <20210304201055.78145b04@coco.lan> In-Reply-To: <20210304201055.78145b04@coco.lan> From: Ezequiel Garcia Date: Thu, 4 Mar 2021 16:34:44 -0300 Message-ID: Subject: Re: v4l2loopback and v4l2-mem2mem framework To: Mauro Carvalho Chehab Cc: Wren Turkal , linux-media Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On Thu, 4 Mar 2021 at 16:11, Mauro Carvalho Chehab wrote: > > Em Tue, 2 Mar 2021 05:01:16 -0300 > Ezequiel Garcia escreveu: > > > Hi Wren, > > > > How about you submit the loopback driver for integration in mainline? > > We can review the driver, give feedback and help you get it merged. > > Please, don't top post. > > The loopback driver is not something that could be merged. It was > already submitted a few times. > > One of the main issues is that userspace may sleep, and this could cause > some bad effects and even hangups due to V4L2 core and VB2 mutex and > spin locks. > Can you elaborate on this? I always felt that it's a shame for something so popular as the loopback to be out-of-tree and unsupported. Thanks, Ezequiel