From patchwork Tue Dec 1 09:31:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: 'Qinglang Miao X-Patchwork-Id: 335390 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 BD903C64E7B for ; Tue, 1 Dec 2020 09:25:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 58133206C0 for ; Tue, 1 Dec 2020 09:25:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390835AbgLAJYc (ORCPT ); Tue, 1 Dec 2020 04:24:32 -0500 Received: from szxga07-in.huawei.com ([45.249.212.35]:8897 "EHLO szxga07-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390814AbgLAJYb (ORCPT ); Tue, 1 Dec 2020 04:24:31 -0500 Received: from DGGEMS412-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4Clc8q3Brfz75s8; Tue, 1 Dec 2020 17:23:23 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS412-HUB.china.huawei.com (10.3.19.212) with Microsoft SMTP Server id 14.3.487.0; Tue, 1 Dec 2020 17:23:42 +0800 From: Qinglang Miao To: Oleksij Rempel , Pengutronix Kernel Team , Shawn Guo , Sascha Hauer , Fabio Estevam , NXP Linux Team CC: , , , Qinglang Miao Subject: [PATCH 4/8] i2c: imx: fix reference leak when pm_runtime_get_sync fails Date: Tue, 1 Dec 2020 17:31:41 +0800 Message-ID: <20201201093141.113135-1-miaoqinglang@huawei.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201201092924.112461-1-miaoqinglang@huawei.com> References: <20201201092924.112461-1-miaoqinglang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org In i2c_imx_xfer() and i2c_imx_remove(), the pm reference count is not expected to be incremented on return. However, pm_runtime_get_sync will increment pm reference count even failed. Forgetting to putting operation will result in a reference leak here. Replace it with pm_runtime_resume_and_get to keep usage counter balanced. Fixes: 3a5ee18d2a32 ("i2c: imx: implement master_xfer_atomic callback") Reported-by: Hulk Robot Signed-off-by: Qinglang Miao Reviewed-by: Oleksij Rempel --- drivers/i2c/busses/i2c-imx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index c98529c76..93d2069da 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -1008,7 +1008,7 @@ static int i2c_imx_xfer(struct i2c_adapter *adapter, struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter); int result; - result = pm_runtime_get_sync(i2c_imx->adapter.dev.parent); + result = pm_runtime_resume_and_get(i2c_imx->adapter.dev.parent); if (result < 0) return result; @@ -1252,7 +1252,7 @@ static int i2c_imx_remove(struct platform_device *pdev) struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev); int irq, ret; - ret = pm_runtime_get_sync(&pdev->dev); + ret = pm_runtime_resume_and_get(&pdev->dev); if (ret < 0) return ret;