From patchwork Mon Mar 1 16:06:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 389568 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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham 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 AD481C43332 for ; Mon, 1 Mar 2021 18:54:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 76BA464DF5 for ; Mon, 1 Mar 2021 18:54:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240636AbhCASwz (ORCPT ); Mon, 1 Mar 2021 13:52:55 -0500 Received: from mail.kernel.org ([198.145.29.99]:53758 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240382AbhCASqU (ORCPT ); Mon, 1 Mar 2021 13:46:20 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6F11A6530F; Mon, 1 Mar 2021 17:42:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614620558; bh=NbpzCYMIvEbZs18qLNVRxseZKiihXVcW5iCjn6/ayIE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rus8od8MTp11tgnH8rqjP5ZfW6SP3sIMh/5RprMZ1XJekxv7+jQ9i1+JF5jHiTpx0 WrUCbCfRp1gBQd4qeTRpHrsbZHNwspsJUowEkK4TwzcdZr1G7rtmGZFnVm4Sqn1Yny 97tIh3Z04NpcCqJ/CnkS4Xx8unPXnF6yuXtWPFYE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ezequiel Garcia , Philipp Zabel , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 5.11 195/775] media: imx: Unregister csc/scaler only if registered Date: Mon, 1 Mar 2021 17:06:03 +0100 Message-Id: <20210301161211.278407234@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161201.679371205@linuxfoundation.org> References: <20210301161201.679371205@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ezequiel Garcia [ Upstream commit bb2216548a2b13cf2942a058b475438a7a6bb028 ] The csc/scaler device pointer (imxmd->m2m_vdev) is assigned after the imx media device v4l2-async probe completes, therefore we need to check if the device is non-NULL before trying to unregister it. This can be the case if the non-completed imx media device is unbinded (or the driver is removed), leading to a kernel oops. Fixes: a8ef0488cc59 ("media: imx: add csc/scaler mem2mem device") Signed-off-by: Ezequiel Garcia Reviewed-by: Philipp Zabel Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/staging/media/imx/imx-media-dev.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/staging/media/imx/imx-media-dev.c b/drivers/staging/media/imx/imx-media-dev.c index 6d2205461e565..338b8bd0bb076 100644 --- a/drivers/staging/media/imx/imx-media-dev.c +++ b/drivers/staging/media/imx/imx-media-dev.c @@ -53,6 +53,7 @@ static int imx6_media_probe_complete(struct v4l2_async_notifier *notifier) imxmd->m2m_vdev = imx_media_csc_scaler_device_init(imxmd); if (IS_ERR(imxmd->m2m_vdev)) { ret = PTR_ERR(imxmd->m2m_vdev); + imxmd->m2m_vdev = NULL; goto unlock; } @@ -107,10 +108,14 @@ static int imx_media_remove(struct platform_device *pdev) v4l2_info(&imxmd->v4l2_dev, "Removing imx-media\n"); + if (imxmd->m2m_vdev) { + imx_media_csc_scaler_device_unregister(imxmd->m2m_vdev); + imxmd->m2m_vdev = NULL; + } + v4l2_async_notifier_unregister(&imxmd->notifier); imx_media_unregister_ipu_internal_subdevs(imxmd); v4l2_async_notifier_cleanup(&imxmd->notifier); - imx_media_csc_scaler_device_unregister(imxmd->m2m_vdev); media_device_unregister(&imxmd->md); v4l2_device_unregister(&imxmd->v4l2_dev); media_device_cleanup(&imxmd->md);