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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 36A14C77B7C for ; Mon, 1 May 2023 15:42:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232827AbjEAPmw (ORCPT ); Mon, 1 May 2023 11:42:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32834 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232818AbjEAPmu (ORCPT ); Mon, 1 May 2023 11:42:50 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 16073BC; Mon, 1 May 2023 08:42:48 -0700 (PDT) Received: from [192.168.2.246] (109-252-144-198.dynamic.spd-mgts.ru [109.252.144.198]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) (Authenticated sender: dmitry.osipenko) by madras.collabora.co.uk (Postfix) with ESMTPSA id EB81C66029DE; Mon, 1 May 2023 16:42:43 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1682955765; bh=tnb48ajCvVa+EQpEey/B5t9Rz5vp0zrnI8Dk3GtJzds=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=WgvDqGNqkRpELu/Mnul8g+QVtXq/hzn4k+FFEpusaFYSFGnm1Jzhw7htlINg83ht0 rimocQaotDdO/fUi53zoTX3QHV7v9281Ek5Igtx+auJwFkjZpXDctQ0M/Kn5vHfS4+ OW4QnmZX768H0BwI2PhD+LIZzOHhUDWBMs+Ix1NrYapO0+w/aY+gydF6hv1Foy7+Gb ViVwJ+6U+FpEkMOKSwdCn/llqkyoZM7FDHdwIeDlq2uH1XtoQerfiViPJdSJ5w6mWI 1vjSPku078f0wkOVjQ9EvdrbQ3FtYALJUEpnGClgOfUj1aOcHAQUZKOvTnrFiO979u 8o4Qf3UIpdQqQ== Message-ID: <14d7ed85-7ab6-04d9-1958-d5ceae2a79f8@collabora.com> Date: Mon, 1 May 2023 18:42:40 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [PATCH v2 6/7] dma-buf: Change locking policy for mmap() Content-Language: en-US From: Dmitry Osipenko To: =?UTF-8?Q?Christian_K=c3=b6nig?= Cc: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-tegra@vger.kernel.org, linux-arm-msm@vger.kernel.org, kernel@collabora.com, Sumit Semwal , Benjamin Gaignard , Liam Mark , Brian Starkey , John Stultz , Gerd Hoffmann , Daniel Vetter , Jani Nikula , Arnd Bergmann , Greg Kroah-Hartman , Thomas Zimmermann , Tomi Valkeinen , Thierry Reding , Tomasz Figa , Marek Szyprowski , Mauro Carvalho Chehab , Srinivas Kandagatla , Amol Maheshwari , Emil Velikov References: <20230406160637.541702-1-dmitry.osipenko@collabora.com> <20230406160637.541702-7-dmitry.osipenko@collabora.com> In-Reply-To: <20230406160637.541702-7-dmitry.osipenko@collabora.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On 4/6/23 19:06, Dmitry Osipenko wrote: > Change locking policy of mmap() callback, making exporters responsible > for handling dma-buf reservation locking. Previous locking policy stated > that dma-buf is locked for both importers and exporters by the dma-buf > core, which caused a deadlock problem for DRM drivers in a case of > self-imported dma-bufs which required to take the lock from the DRM > exporter side. > > Reviewed-by: Emil Velikov > Signed-off-by: Dmitry Osipenko > --- > drivers/dma-buf/dma-buf.c | 17 +++-------------- > 1 file changed, 3 insertions(+), 14 deletions(-) Christian, may I add yours ack to this patch? -- Best regards, Dmitry