From patchwork Tue Aug 10 17:28:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 495774 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=-19.5 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 BA4F8C4320E for ; Tue, 10 Aug 2021 17:55:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A29FE603E7 for ; Tue, 10 Aug 2021 17:55:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236214AbhHJRzu (ORCPT ); Tue, 10 Aug 2021 13:55:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:50372 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236998AbhHJRyN (ORCPT ); Tue, 10 Aug 2021 13:54:13 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 746B961371; Tue, 10 Aug 2021 17:44:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1628617448; bh=76zOx8RR5kNg3eS8gh3KAjbFpnzDu9itDLeMLvoYuqo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ysgc7HRKPXBe1uzOVJ0fdIldjMUXJjc98ReahtVaU7f7+8u/CNb8tPPhF1/q/ONm3 cVKSx6RQjmOVBdgGViVD6Z6pnOfxLF2gkHbLvjiYyq+BO2UEpZP80MYaJkxL0sbfhH Hgj79gnzn438JfMwK+jrDtqnmLZ1R8jbDf2WM2tU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Zhang Qilong , Vinod Koul , Sasha Levin Subject: [PATCH 5.13 030/175] dmaengine: stm32-dmamux: Fix PM usage counter unbalance in stm32 dmamux ops Date: Tue, 10 Aug 2021 19:28:58 +0200 Message-Id: <20210810173001.948045507@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210810173000.928681411@linuxfoundation.org> References: <20210810173000.928681411@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Zhang Qilong [ Upstream commit baa16371c9525f24d508508e4d296c031e1de29c ] pm_runtime_get_sync will increment pm usage counter even it failed. Forgetting to putting operation will result in reference leak here. We fix it by replacing it with pm_runtime_resume_and_get to keep usage counter balanced. Fixes: 4f3ceca254e0f ("dmaengine: stm32-dmamux: Add PM Runtime support") Signed-off-by: Zhang Qilong Link: https://lore.kernel.org/r/20210607064640.121394-3-zhangqilong3@huawei.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/stm32-dmamux.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c index ef0d0555103d..a42164389ebc 100644 --- a/drivers/dma/stm32-dmamux.c +++ b/drivers/dma/stm32-dmamux.c @@ -137,7 +137,7 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec, /* Set dma request */ spin_lock_irqsave(&dmamux->lock, flags); - ret = pm_runtime_get_sync(&pdev->dev); + ret = pm_runtime_resume_and_get(&pdev->dev); if (ret < 0) { spin_unlock_irqrestore(&dmamux->lock, flags); goto error; @@ -336,7 +336,7 @@ static int stm32_dmamux_suspend(struct device *dev) struct stm32_dmamux_data *stm32_dmamux = platform_get_drvdata(pdev); int i, ret; - ret = pm_runtime_get_sync(dev); + ret = pm_runtime_resume_and_get(dev); if (ret < 0) return ret; @@ -361,7 +361,7 @@ static int stm32_dmamux_resume(struct device *dev) if (ret < 0) return ret; - ret = pm_runtime_get_sync(dev); + ret = pm_runtime_resume_and_get(dev); if (ret < 0) return ret;