From patchwork Tue May 11 12:44:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pratyush Yadav X-Patchwork-Id: 434569 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=-19.4 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, URIBL_BLOCKED, 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 E4F98C433ED for ; Tue, 11 May 2021 12:44:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B21136191A for ; Tue, 11 May 2021 12:44:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231586AbhEKMp5 (ORCPT ); Tue, 11 May 2021 08:45:57 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:35982 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230315AbhEKMp4 (ORCPT ); Tue, 11 May 2021 08:45:56 -0400 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 14BCifrQ033227; Tue, 11 May 2021 07:44:41 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1620737081; bh=rnLxLj7u+SRLP5C+EjI1XluTvjiwwG/phu5Ue2Vyc5o=; h=From:To:CC:Subject:Date; b=WkEK4G8UxDxAtcIk6gW/8aa83MBphi8eovNJOxd/BmA0yF0TP+HSlUoVCHE+FofTu b62t2BTWAr9KMCBz9kI61bXVoYBtog5CMUIZe5vgWwmoZZE+9aRsGvFpNkK7/PNw1z FQoBZekF+mCmxwkaT5VjoxbSezLL1gaAjWw1tdK4= Received: from DLEE102.ent.ti.com (dlee102.ent.ti.com [157.170.170.32]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 14BCifir115752 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 11 May 2021 07:44:41 -0500 Received: from DLEE115.ent.ti.com (157.170.170.26) by DLEE102.ent.ti.com (157.170.170.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Tue, 11 May 2021 07:44:40 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DLEE115.ent.ti.com (157.170.170.26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2 via Frontend Transport; Tue, 11 May 2021 07:44:40 -0500 Received: from pratyush-OptiPlex-790.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 14BCicYt110487; Tue, 11 May 2021 07:44:38 -0500 From: Pratyush Yadav To: Mauro Carvalho Chehab , Sakari Ailus , Paul Kocialkowski , Dan Carpenter , , CC: Pratyush Yadav Subject: [PATCH] media: i2c: ov5648: Plug runtime pm counter leak Date: Tue, 11 May 2021 18:14:37 +0530 Message-ID: <20210511124437.9930-1-p.yadav@ti.com> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org When the stream is being enabled, the runtime pm usage counter is incremented. Then if ov5648_sw_standby() fails, the function returns error without decrementing the counter, leaking it. Signed-off-by: Pratyush Yadav --- Hi, I spotted this when converting OV5640 driver to use runtime PM using this driver as reference. I only have a very surface level understanding of runtime PM system as of now so please review with that in mind. This patch is only compile-tested since I don't have the hardware with me. drivers/media/i2c/ov5648.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) -- 2.30.0 diff --git a/drivers/media/i2c/ov5648.c b/drivers/media/i2c/ov5648.c index 3ecb4a3e8773..6aa2c950f505 100644 --- a/drivers/media/i2c/ov5648.c +++ b/drivers/media/i2c/ov5648.c @@ -2143,8 +2143,12 @@ static int ov5648_s_stream(struct v4l2_subdev *subdev, int enable) ret = ov5648_sw_standby(sensor, !enable); mutex_unlock(&sensor->mutex); - if (ret) + if (ret) { + if (enable) + pm_runtime_put(sensor->dev); + return ret; + } state->streaming = !!enable;