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 0363AC677F1 for ; Mon, 16 Jan 2023 17:01:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233182AbjAPRBz (ORCPT ); Mon, 16 Jan 2023 12:01:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234103AbjAPRBG (ORCPT ); Mon, 16 Jan 2023 12:01:06 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 797E25A36B for ; Mon, 16 Jan 2023 08:43:31 -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 dfw.source.kernel.org (Postfix) with ESMTPS id CCC8F61086 for ; Mon, 16 Jan 2023 16:43:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E0E8CC433D2; Mon, 16 Jan 2023 16:43:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673887410; bh=8ZrSRk56F7HqdoQq6h2Jqu1RxxCRzBzRcEMeSBifkIY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dViFbmXhlTJig6x0m0K052txfFmgYngKnpHskJvJZmZeOEbuBP60O0nnGVUqgCHkJ Ig45bWkO1CLrhZ6NBFR10143dxObdY1LWacqWV1e4yiPsw8c/vUjQSpkn3jVLWp+P+ kS7DkzepBUHaKAOG14x9uHSfqXvPuU0A4tx1jwx0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuan Can , Hans Verkuil , Sasha Levin Subject: [PATCH 4.19 109/521] media: platform: exynos4-is: Fix error handling in fimc_md_init() Date: Mon, 16 Jan 2023 16:46:11 +0100 Message-Id: <20230116154852.132777041@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154847.246743274@linuxfoundation.org> References: <20230116154847.246743274@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: Yuan Can [ Upstream commit b434422c45282a0573d8123239abc41fa72665d4 ] A problem about modprobe s5p_fimc failed is triggered with the following log given: [ 272.075275] Error: Driver 'exynos4-fimc' is already registered, aborting... modprobe: ERROR: could not insert 's5p_fimc': Device or resource busy The reason is that fimc_md_init() returns platform_driver_register() directly without checking its return value, if platform_driver_register() failed, it returns without unregister fimc_driver, resulting the s5p_fimc can never be installed later. A simple call graph is shown as below: fimc_md_init() fimc_register_driver() # register fimc_driver platform_driver_register() platform_driver_register() driver_register() bus_add_driver() dev = kzalloc(...) # OOM happened # return without unregister fimc_driver Fix by unregister fimc_driver when platform_driver_register() returns error. Fixes: d3953223b090 ("[media] s5p-fimc: Add the media device driver") Signed-off-by: Yuan Can Signed-off-by: Hans Verkuil Signed-off-by: Sasha Levin --- drivers/media/platform/exynos4-is/fimc-core.c | 2 +- drivers/media/platform/exynos4-is/media-dev.c | 6 +++++- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/exynos4-is/fimc-core.c b/drivers/media/platform/exynos4-is/fimc-core.c index d8d8c9902b19..cc8bc41b7db7 100644 --- a/drivers/media/platform/exynos4-is/fimc-core.c +++ b/drivers/media/platform/exynos4-is/fimc-core.c @@ -1255,7 +1255,7 @@ int __init fimc_register_driver(void) return platform_driver_register(&fimc_driver); } -void __exit fimc_unregister_driver(void) +void fimc_unregister_driver(void) { platform_driver_unregister(&fimc_driver); } diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c index 3261dc72cc61..03171f2cf296 100644 --- a/drivers/media/platform/exynos4-is/media-dev.c +++ b/drivers/media/platform/exynos4-is/media-dev.c @@ -1566,7 +1566,11 @@ static int __init fimc_md_init(void) if (ret) return ret; - return platform_driver_register(&fimc_md_driver); + ret = platform_driver_register(&fimc_md_driver); + if (ret) + fimc_unregister_driver(); + + return ret; } static void __exit fimc_md_exit(void) -- 2.35.1