From patchwork Thu May 24 20:35:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ezequiel Garcia X-Patchwork-Id: 10425497 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E1BE260327 for ; Thu, 24 May 2018 20:37:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D199229599 for ; Thu, 24 May 2018 20:37:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C68F32971B; Thu, 24 May 2018 20:37:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6AC1E29599 for ; Thu, 24 May 2018 20:37:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1034642AbeEXUhQ (ORCPT ); Thu, 24 May 2018 16:37:16 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:56690 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1033167AbeEXUhO (ORCPT ); Thu, 24 May 2018 16:37:14 -0400 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: ezequiel) with ESMTPSA id A274F286F45 From: Ezequiel Garcia To: linux-media@vger.kernel.org Cc: Hans Verkuil , kernel@collabora.com, Abylay Ospan , Ezequiel Garcia Subject: [PATCH 13/20] davinci_vpfe: Add video_device and vb2_queue locks Date: Thu, 24 May 2018 17:35:13 -0300 Message-Id: <20180524203520.1598-14-ezequiel@collabora.com> X-Mailer: git-send-email 2.16.3 In-Reply-To: <20180524203520.1598-1-ezequiel@collabora.com> References: <20180524203520.1598-1-ezequiel@collabora.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently, this driver does not serialize its video4linux ioctls, which is a bug, as race conditions might appear. In addition, video_device and vb2_queue locks are now both mandatory. Add them, and implement wait_prepare and wait_finish. To stay on the safe side, this commit uses a single mutex for both locks. Better latency can be obtained by separating these if needed. Signed-off-by: Ezequiel Garcia --- drivers/staging/media/davinci_vpfe/vpfe_video.c | 6 +++++- drivers/staging/media/davinci_vpfe/vpfe_video.h | 2 +- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/staging/media/davinci_vpfe/vpfe_video.c b/drivers/staging/media/davinci_vpfe/vpfe_video.c index 390fc98d07dd..1269a983455e 100644 --- a/drivers/staging/media/davinci_vpfe/vpfe_video.c +++ b/drivers/staging/media/davinci_vpfe/vpfe_video.c @@ -1312,6 +1312,8 @@ static const struct vb2_ops video_qops = { .stop_streaming = vpfe_stop_streaming, .buf_cleanup = vpfe_buf_cleanup, .buf_queue = vpfe_buffer_queue, + .wait_prepare = vb2_ops_wait_prepare, + .wait_finish = vb2_ops_wait_finish, }; /* @@ -1357,6 +1359,7 @@ static int vpfe_reqbufs(struct file *file, void *priv, q->buf_struct_size = sizeof(struct vpfe_cap_buffer); q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; q->dev = vpfe_dev->pdev; + q->lock = &video->lock; ret = vb2_queue_init(q); if (ret) { @@ -1598,17 +1601,18 @@ int vpfe_video_init(struct vpfe_video_device *video, const char *name) return -EINVAL; } /* Initialize field of video device */ + mutex_init(&video->lock); video->video_dev.release = video_device_release; video->video_dev.fops = &vpfe_fops; video->video_dev.ioctl_ops = &vpfe_ioctl_ops; video->video_dev.minor = -1; video->video_dev.tvnorms = 0; + video->video_dev.lock = &video->lock; snprintf(video->video_dev.name, sizeof(video->video_dev.name), "DAVINCI VIDEO %s %s", name, direction); spin_lock_init(&video->irqlock); spin_lock_init(&video->dma_queue_lock); - mutex_init(&video->lock); ret = media_entity_pads_init(&video->video_dev.entity, 1, &video->pad); if (ret < 0) diff --git a/drivers/staging/media/davinci_vpfe/vpfe_video.h b/drivers/staging/media/davinci_vpfe/vpfe_video.h index 22136d3dadcb..4bbd219e8329 100644 --- a/drivers/staging/media/davinci_vpfe/vpfe_video.h +++ b/drivers/staging/media/davinci_vpfe/vpfe_video.h @@ -128,7 +128,7 @@ struct vpfe_video_device { spinlock_t irqlock; /* IRQ lock for DMA queue */ spinlock_t dma_queue_lock; - /* lock used to access this structure */ + /* lock used to serialize all video4linux ioctls */ struct mutex lock; /* number of users performing IO */ u32 io_usrs;