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 D13BCC4167B for ; Wed, 28 Dec 2022 15:38:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233517AbiL1PiT (ORCPT ); Wed, 28 Dec 2022 10:38:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233916AbiL1PiR (ORCPT ); Wed, 28 Dec 2022 10:38:17 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2740216598 for ; Wed, 28 Dec 2022 07:38:17 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id B855DB81710 for ; Wed, 28 Dec 2022 15:38:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 32B93C433EF; Wed, 28 Dec 2022 15:38:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672241894; bh=ds3eCcpdginc4ug2YeaenO+SBOWQllEdDcqHmmnSRko=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eRJKcpAyf0AsoFq6Rqhdt6lxpqRwMdlQxypSPwkvVVvRWbTlyBQz5HFIy0repfCQd LoE+7t+TMh3roa5DUvIbnqZ8sbkTRuMy8KNGfb/HKoF0Tdd6A38fjXvlHUVskW21GF nTu0HuNx5TYEhQnL1E/7M/QFwcSW1yZbyBUD7BNA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vladimir Zapolskiy , Robert Foss , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 6.1 0302/1146] media: camss: Clean up received buffers on failed start of streaming Date: Wed, 28 Dec 2022 15:30:41 +0100 Message-Id: <20221228144338.350638089@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144330.180012208@linuxfoundation.org> References: <20221228144330.180012208@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Vladimir Zapolskiy [ Upstream commit c8f3582345e6a69da65ab588f7c4c2d1685b0e80 ] It is required to return the received buffers, if streaming can not be started. For instance media_pipeline_start() may fail with EPIPE, if a link validation between entities is not passed, and in such a case a user gets a kernel warning: WARNING: CPU: 1 PID: 520 at drivers/media/common/videobuf2/videobuf2-core.c:1592 vb2_start_streaming+0xec/0x160 Call trace: vb2_start_streaming+0xec/0x160 vb2_core_streamon+0x9c/0x1a0 vb2_ioctl_streamon+0x68/0xbc v4l_streamon+0x30/0x3c __video_do_ioctl+0x184/0x3e0 video_usercopy+0x37c/0x7b0 video_ioctl2+0x24/0x40 v4l2_ioctl+0x4c/0x70 The fix is to correct the error path in video_start_streaming() of camss. Fixes: 0ac2586c410f ("media: camss: Add files which handle the video device nodes") Signed-off-by: Vladimir Zapolskiy Reviewed-by: Robert Foss Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/platform/qcom/camss/camss-video.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/media/platform/qcom/camss/camss-video.c b/drivers/media/platform/qcom/camss/camss-video.c index 81fb3a5bc1d5..41deda232e4a 100644 --- a/drivers/media/platform/qcom/camss/camss-video.c +++ b/drivers/media/platform/qcom/camss/camss-video.c @@ -495,7 +495,7 @@ static int video_start_streaming(struct vb2_queue *q, unsigned int count) ret = video_device_pipeline_start(vdev, &video->pipe); if (ret < 0) - return ret; + goto flush_buffers; ret = video_check_format(video); if (ret < 0) @@ -524,6 +524,7 @@ static int video_start_streaming(struct vb2_queue *q, unsigned int count) error: video_device_pipeline_stop(vdev); +flush_buffers: video->ops->flush_buffers(video, VB2_BUF_STATE_QUEUED); return ret; -- 2.35.1