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 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 EB6D3C64E7D for ; Fri, 27 Nov 2020 09:41:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B5DE120B80 for ; Fri, 27 Nov 2020 09:41:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729194AbgK0Jl0 (ORCPT ); Fri, 27 Nov 2020 04:41:26 -0500 Received: from szxga06-in.huawei.com ([45.249.212.32]:8437 "EHLO szxga06-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729174AbgK0JlX (ORCPT ); Fri, 27 Nov 2020 04:41:23 -0500 Received: from DGGEMS402-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4Cj8l41HTzzhjF1; Fri, 27 Nov 2020 17:41:04 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS402-HUB.china.huawei.com (10.3.19.202) with Microsoft SMTP Server id 14.3.487.0; Fri, 27 Nov 2020 17:41:11 +0800 From: Qinglang Miao To: Vinod Koul , Dan Williams , Maxime Coquelin , Alexandre Torgue CC: , , , , Qinglang Miao Subject: [PATCH 3/3] dmaengine: stm32-mdma: fix reference leak in stm32-mdma Date: Fri, 27 Nov 2020 17:45:25 +0800 Message-ID: <20201127094525.121388-4-miaoqinglang@huawei.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201127094525.121388-1-miaoqinglang@huawei.com> References: <20201127094525.121388-1-miaoqinglang@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org pm_runtime_get_sync will increment pm usage counter even it failed. Forgetting to putting operation will result in a reference leak here. A new function pm_runtime_resume_and_get is introduced in [0] to keep usage counter balanced. So We fix the reference leak by replacing it with new funtion. [0] dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter") Fixes: 7cb819c856d9 ("dmaengine: stm32-mdma: add suspend/resume power management support") Reported-by: Hulk Robot Signed-off-by: Qinglang Miao --- drivers/dma/stm32-mdma.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c index 08cfbfab8..9d4739237 100644 --- a/drivers/dma/stm32-mdma.c +++ b/drivers/dma/stm32-mdma.c @@ -1448,7 +1448,7 @@ static int stm32_mdma_alloc_chan_resources(struct dma_chan *c) return -ENOMEM; } - ret = pm_runtime_get_sync(dmadev->ddev.dev); + ret = pm_runtime_resume_and_get(dmadev->ddev.dev); if (ret < 0) return ret; @@ -1714,7 +1714,7 @@ static int stm32_mdma_pm_suspend(struct device *dev) u32 ccr, id; int ret; - ret = pm_runtime_get_sync(dev); + ret = pm_runtime_resume_and_get(dev); if (ret < 0) return ret; -- 2.23.0