From patchwork Wed Jun 10 23:05:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Niklas_S=C3=B6derlund?= X-Patchwork-Id: 209532 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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 141E0C433E7 for ; Wed, 10 Jun 2020 23:06:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E18E220835 for ; Wed, 10 Jun 2020 23:06:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726777AbgFJXGD (ORCPT ); Wed, 10 Jun 2020 19:06:03 -0400 Received: from vsp-unauthed02.binero.net ([195.74.38.227]:8720 "EHLO vsp-unauthed02.binero.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726753AbgFJXGC (ORCPT ); Wed, 10 Jun 2020 19:06:02 -0400 X-Halon-ID: f05f6433-ab6e-11ea-933e-005056917a89 Authorized-sender: niklas@soderlund.pp.se Received: from bismarck.berto.se (p4fca2eca.dip0.t-ipconnect.de [79.202.46.202]) by bin-vsp-out-01.atm.binero.net (Halon) with ESMTPA id f05f6433-ab6e-11ea-933e-005056917a89; Thu, 11 Jun 2020 01:05:55 +0200 (CEST) From: =?utf-8?q?Niklas_S=C3=B6derlund?= To: Hans Verkuil , Laurent Pinchart , linux-media@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, =?utf-8?q?Niklas_S=C3=B6derlund?= Subject: [PATCH 5/5] rcar-vin: Do not unregister video device when a subdevice is unbound Date: Thu, 11 Jun 2020 01:05:41 +0200 Message-Id: <20200610230541.1603067-6-niklas.soderlund+renesas@ragnatech.se> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200610230541.1603067-1-niklas.soderlund+renesas@ragnatech.se> References: <20200610230541.1603067-1-niklas.soderlund+renesas@ragnatech.se> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org If the v4l2-async notifier have once been complete and the video device(s) have been register, do not unregister them if one subdevice is unbound. Depending on which subdevice is unbound other parts of the pipeline could still be functional. For example if one of multiple sensors connected to a CSI-2 transmitter is unbound other sensors in that pipeline are still useable. This problem is extra critical for R-Car VIN which registers two independent CSI-2 receivers in the same media graph as they can both be used by the same dma-engines. If one of the CSI-2 receivers are unbound the other CSI-2 receiver pipeline is still fully functional. Signed-off-by: Niklas Söderlund --- drivers/media/platform/rcar-vin/rcar-core.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c index 7440c8965d27e64f..6b0f13618556cac4 100644 --- a/drivers/media/platform/rcar-vin/rcar-core.c +++ b/drivers/media/platform/rcar-vin/rcar-core.c @@ -525,7 +525,6 @@ static int rvin_parallel_subdevice_attach(struct rvin_dev *vin, static void rvin_parallel_subdevice_detach(struct rvin_dev *vin) { - rvin_v4l2_unregister(vin); vin->parallel->subdev = NULL; if (!vin->info->use_mc) { @@ -747,10 +746,6 @@ static void rvin_group_notify_unbind(struct v4l2_async_notifier *notifier, struct rvin_dev *vin = v4l2_dev_to_vin(notifier->v4l2_dev); unsigned int i; - for (i = 0; i < RCAR_VIN_NUM; i++) - if (vin->group->vin[i]) - rvin_v4l2_unregister(vin->group->vin[i]); - mutex_lock(&vin->group->lock); for (i = 0; i < RVIN_CSI_MAX; i++) {